Power Guide to
Transcription
Power Guide to
TECHNOLOGY ADVICE YOU CAN TRUST TM ◆ WWW.PCWORLD.COM ◆ PC WORLD MAGAZINE SUBSCRIPTIONS >>SPECIAL BONUS COLLECTION<< Power Guide to PC Hardware ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ FAT32 ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ NTFS Copyright © 2002, PC World Communications, Inc. All rights reserved. The trademark PC World is owned by International Data Group and used under license by PC World Communications, Inc. Printed in the United States. You must have permission before reproducing any material from PC World. Direct inquiries to [email protected]. HERE’S HOW HARDWARE TIPS KIRK STEERS A Cool Breeze Keeps Your PC’s Innards From Frying do the cold, dark days of winter have you dreaming of tropical beaches, sunny deserts, and the inside of your PC? You read right. The climate inside your computer can rival that of Death Valley in the summer, and triple-digit temperatures are bad news for your hardware. Most desktop PCs run comfortably when their internal temperature is between 60 and 110 degrees Fahrenheit. (Check your system documentation to find your PC’s exact range.) Internal temperatures over 110 degrees can stress delicate circuits and electrical contacts, which may substantially shorten your computer’s life. Hard drives are especially vulnerable when the temperature goes up: Data transfers slow down, and data written to the disk is more likely to be lost. Here’s how to beat the PC heat. Avoid ups and downs: Sudden changes in temperature are just as harmful to your PC’s circuitry as high temperatures. The A CONFLICTED MOUSE DOES YOUR CURSOR sometimes appear and disappear, move in the wrong direction, or change size and shape? It could be a sign of mouse trouble, which is often due to a conflict with your graphics card’s driver. If you use Windows 9x or Me, there may be a solution simpler than installing an updated driver. Open Control Panel, double-click the System icon, choose the Performance tab, and click the Graphics button. Move the slider next to Hardware Acceleration one notch to the left. This change disables some graphics capabilities, but it may be the solution to your rodent problem. 154 W W W. P C W O R L D.C O M FEBRUARY 2002 biggest temperature changes occur when you turn your system on and off, so leave your PC on but use its power-management functions to keep its innards as cool as possible when it’s idle. When you turn on your computer in a really cold office, let the system warm up for 15 minutes before saving anything to its hard drive. Listen to your fans: Your PC keeps cool by blowing a constant stream of air through its case. The primary air mover in most PCs is the power-supply fan, although some systems have an additional ventilation fan built into the case. Even in relatively clean offices, dust can accumulate on the fan intakes and seriously obstruct airflow. Clean your PC’s fans and fan intakes regularly, especially if you hear a change in the fans’ one-note whir. Most CPUs also have a cooling device— either a fan or a heat sink. (A heat sink is a metal plate with fins or spikes intended to dissipate heat.) If your CPU’s fan or heat sink stops functioning properly, a CPU failure won’t be far behind. A heat sink needs a constant flow of air to remove heat. In most PCs, the internal fans provide the required airflow. Never leave the case off your system while it’s running. Going topless may lower the overall temperature inside your PC, but it also destroys the internal airflow patterns that keep your CPU and other components from overheating. Mercury rising: Most PCs made in the last few years monitor and report on the state of their case, CPU, and power-supply fans. Some also provide data on the system’s internal temperature, and some have a temperature alarm built into their BIOS. You usually have to open your sys- tem’s CMOS setup program to see these statistics. But we’ve found a handy workaround: Just use Alex van Kaam’s Motherboard Monitor freeware utility to keep watch over your PC’s fans, voltages, and temperatures. Head to find.pcworld. com/16020 to download the program. AGP 3: WORTH THE UPGRADE? I REPLACED MY 1X/2X AGP graphics card with a 2X/4X AGP adapter, but my graphics performance has not improved. Should I have waited for the AGP 8X cards to come out? Evan Nathan, Dallas absolutely not. Applications that take full advantage of AGP 8X transfer speeds are at least a year away. Other improvements to third-generation AGP graphics cards should enhance graphics performance, however. FIGURE 1 shows the maximum transfer rates of the AGP versions. AGP DATA TRANSFER RATES AGP SPEED AGP 1X Transfer speed (MB/second) 266 AGP 2X 533 AGP 4X 1066 AGP 8X 2133 FIGURE 1: FASTER AGP rates speed up texture maps but won’t help most applications. AGP’s strength is its ability to process texture maps. Certain 3D games and a few 3D graphics development tools are currently the only programs that benefit greatly from fast-moving texture maps. To make sure you’re getting the full benefits of AGP 4X, go into your CMOS setup program and make sure your PC is set to run at AGP 4X rather than 2X. Load the latest AGP drivers onto your PC. The AGP drivers that come with Windows 9x are limited, and systems using AMD’s Athlon CPU don’t work well with older drivers. Check with the manufacturer of your PC, motherboard, or chip set—in that order—to find updated driv ers and installation instructions. Hardware Tips welcomes your tips and questions and pays $50 for published items. Kirk Steers is a PC World contributing editor. HERE’S HOW KIRK STEERS CONNECT DEVICES WITH A USB HUB A UTILITY FOR CACHE MANAGEMENT AN OLD AGP CARD IN A NEW AGP SLOT For Fast, Easy Computing, USB Is the Bus to Ride lots of things get better with time: friendship, a fine cabernet, and yes, even PCs. Every day we’re bombarded by advertisements hawking systems that are faster and cheaper—so much so that it’s easy to lose sight of really useful improvements, like the Universal Serial Bus. USB is the way to connect anything to your PC. It’s fast, simple, and so much better than parallel and serial ports that they look downright medieval by comparison. (Not to say that leeches and a good suit of armor don’t come in handy every now and then. But, hey, enough about my personal life.) Judging from all the e-mail I get about problems with parallel and serial ports, a surprising number of you still aren’t aware of just how great USB is. And with USB 2.0, the spec gains even more advantages. Here’s a rundown on why you should be riding with USB. Ease of use: USB just works better. Period. Getting hardware to function on a ser- SPEND YOUR CACHE WISELY WHEN YOUR PC uses the same chunk of data over and over, it often stores that piece of information in fast memory, or cache, where it can retrieve the data faster than it can off a hard drive. Storing the right amount of data in the cache can improve your PC’s performance. Outer Technologies’ $10 Cacheman is an excellent shareware utility that lets you conveniently monitor memory use and control your cache settings. Go to find. pcworld.com/17641 to get the download. 154 W W W. P C W O R L D.C O M MARCH 2002 ial or parallel port often requires a complicated configuration. USB avoids the hassles of setting and juggling IRQs and other resources. One IRQ covers all the hardware attached to each USB port. USB peripherals have fewer compatibility problems than peripherals using serial or parallel ports. Speed: A USB 1.1 controller transfers data at up to 12 mbps, or about four times faster than the speediest parallel port and 100 times quicker than a serial port. While that won’t affect the performance of a mouse or FIGURE 1: EASILY ADD AND REMOVE USB hardware by joystick, it makes a big difinstalling a USB hub such as Belkin’s four-port device. ference with printers, scanners, and other data-hungry peripherals. that sits on your desktop. Dedicated hubs have clusters of two, four, or more ports. Portability: All USB devices can be hotBelkin’s four-port USB 2.0 hub, for examswapped, which means that you can plug ple, costs as little as $52 online (see FIGa piece of hardware into your PC, or unURE 1). If your hub connects lots of USB plug one, while your system is running. devices to your PC, make sure you have The operating system will automatically adequate power to run them all. Printers recognize and configure new USB devices. and many similar devices have their own Support for old hardware: There once was a power connections, but mice, keyboards, lack of USB peripherals, but now almost modems, and others get their power from every I/O device comes in a USB version. the USB connection. If the devices need Even old devices run off USB by using an more power than the USB port can delivadapter that converts parallel, serial, and er, the entire bus may shut down. When other devices to USB. Belkin and SIIG are this happens, Windows displays a warntwo vendors that offer such adapters. ing icon next to the Universal Serial Bus One port, many devices: With the use of a Controller entry in Device Manager. ForUSB controller, a single USB port can tunately, you can avoid power problems theoretically support up to 127 different by using the right type of USB hub. devices, although practically speaking, it’s Bus-powered USB hubs draw electriciunlikely you’ll ever run more than ten USB VS. FIREWIRE DATA RATES SPECIFICATION Maximum data rate (mbps) Comments Supports low-speed (up to 1.5 mbps) peripherals such as mice and keyboards, as well as printers, scanners, and other medium-speed devices. USB 1.1 12 USB 2.0 480 Also called High-Speed USB, the new standard is fast enough to support external hard drives, CD-RW drives, and other high-speed peripherals. IEEE 1394 (FireWire) 400 Popular spec for digital video cameras; will allow direct connection of IEEE 1394 devices (such as a DVD player to a TV) without the signal having to pass through a PC. FIGURE 2: USB 2.0 HARDWARE MOVES DATA slightly faster than devices using an IEEE 1394 (FireWire) connection, but it can be more than 40 times faster than USB 1.1 devices. ty from the incoming USB connector and output up to 100 mA per port (that’s milliamps, a measure of electrical current). Self-powered hubs draw their own power or, in the case of the root hub in your PC, get it from the PC. They provide up to 500 mA per port. Keyboards, mice, and other low-power USB devices use 25 mA to 40 mA and run well on a 100-mA port of a bus-powered hub. More-demanding devices need to use a self-powered hub. PHOTOGRAPH: MARC SIMON HARDWARE TIPS peripherals at one time. All the devices connected to a USB 1.1 controller have to share its 12-mbps bandwidth. If you need to run multiple devices that eat up more than 12 mbps, you can use a PCI adapter card to add a USB controller to your PC. Belkin sells a USB 1.1 PCI adapter card for $39 and a USB 2.0 version for $59. Easy linking: If you’ve ever tried to chain together two devices—such as a printer and a Zip drive—you know it can be a real nightmare. USB allows any device to be connected to any other USB device that has a built-in hub. So you’ll never have to crawl under your desk to reach the back of your PC when attaching a peripheral. Some keyboards and monitors have built-in hubs with one or two USB ports. If you don’t already have one of these, consider buying a dedicated USB hub If you buy a self-powered hub, make sure it provides a full 500 mA to each port—some don’t. To check, divide the hub’s total amperage rating (found in its documentation or on the power supply) by the number of ports. For example, a four-port hub should provide at least 500 mA per port, or 2 amps total. If your PC originally shipped with Windows 98 or later, it almost certainly has a set of working USB ports. Look on the back of your PC for two narrow, rectangular openings. If you have an older system without USB, an adapter card should get you up and running. (Using USB on systems running Windows 95 is, at best, problematic. If that’s what you’re using, consider an OS upgrade.) Many PC peripherals now support the USB 2.0 specification. USB 2.0 devices can run more than 40 times faster than those using USB 1.1. The top USB 2.0 data rate is 480 mbps, which is faster than the IEEE 1394 (FireWire) ports that run hard drives, digital still and video cameras, and CD-RW drives (see FIGURE 2). USB 2.0 products are backward compatible, so you can use older USB devices on a USB 2.0–equipped PC. So what’s the catch? USB 2.0 products are a bit more expensive. Also, the selection of USB 2.0 devices is limited at present, and they require a USB 2.0-ready PC to run them. Look for the first USB 2.0–ready motherboards and systems to hit the mar- HERE’S HOW H A R D WA R E T I P S ket sometime this spring. You can add USB 2.0 functionality to your system now by using one of the adapters mentioned above. But before buying a USB 2.0 product, check with the vendor to confirm the availability of USB drivers for your operating system. As I write this, USB drivers for Windows XP are still unavailable, and drivers for Windows 98 and Me aren’t always included with USB products. ANY AGP PORT IN A STORM? MY BROTHER JUST gave me his old Pentium III PC minus a graphics card. I opened up its case to add the AGP 2X graphics card I took from my former computer, but the AGP slot in the P-III PC is much longer than the slot in my old system. Can I safely add my old graphics card to the newer computer’s AGP slot? Peter Miller, Topeka, Kansas you probably can, but before adding an old AGP card to a new motherboard, make sure the two are compatible. There are three different types of AGP slots: the original AGP 1.0 1X/2X slot, the AGP 2.0 2X/4X slot, and the AGP Pro slot. The 1X/2X version is the shortest and can be distinguished from the 4X type by a small separator that divides it into two sections. The 4X slot also has extra pins at one end. From your description, your PC probably has an AGP Pro slot. These slots have an extension added to the end of the 4X slot without the extra pins. While the AGP Pro slots are designed for top-end graphics cards costing over $1000, they are also found frequently on motherboards used in mainstream PCs. Because the AGP Pro slot is backward compatible, a 1X/2X or 2X/4X AGP card will work in the slot. But take care when inserting a 1X/2X card to avoid incorrectly inserting it into the AGP Pro extension. Often these extensions come with a cover to prevent this, but the covers can fall off. Also make sure your graphics card and motherboard support the same operating voltages. The original AGP 1.0 spec called for motherboards and cards that operate at 3.3V, and the AGP 2.0 spec added support for operation at 1.5V. If your old graphics card operates at 3.3V, you’ll need a motherboard that supports 3.3V AGP. Likewise, a card that runs at 1.5V needs a corresponding AGP slot. Fortunately, many motherboards come with ‘universal’ AGP slots that support either voltage, and many of the latest graphics cards support both voltages as well. Not all setups do, however. A few motherboards out there run exclusively at 1.5V and won’t support the older 3.3V cards. Check with your motherboard and graphics card vendors to determine your hardware’s precise requirements. Kirk Steers is a PC World contributing editor. Reach him at [email protected]. Hardware Tips welcomes your tips and questions and pays $50 for published items. HERE’S HOW THE INS AND OUTS OF CPU UPGRADES MATCH UP YOUR MOTHERBOARD FASTER WRITING TO REMOVABLE DISKS Will a New CPU Give Your PC More Vroom? if you think you can feed your need for PC speed without investing in a whole new system, simply by replacing your old CPU with a newer and faster one, you’re right—probably. A CPU upgrade can be a cost-effective way to boost PC performance, but it’s not for everyone. Any prospective upgrader should ask two questions: How much performance will a new processor add to my PC? And is the bounce worth the cost? You can find a CPU upgrade for almost any PC—from systems based on Intel’s ancient 80486 chip through today’s Pentium III models. But don’t expect miracles from a new CPU if its clock speed is only slightly higher than that of your current CPU. A new processor running at twice the clock speed you’re used to won’t come close to doubling your system’s performance. A 10 to 20 percent jump in performance is more realistic. MORE ZIP FOR YOUR ZIP IF YOU FREQUENTLY use a removable storage drive—such as an Iomega Zip or Jaz drive—you can speed up data writing to the drive by enabling write-behind caching. This arrangement allows Windows to temporarily store data destined for the disk in RAM and then write it to the disk when no other tasks are being performed. To enable this option, launch Control Panel’s System applet, select Performance•File System•Removable Disk, and check the Enable write-behind caching on all removable disk drives box. 198 W W W. P C W O R L D.C O M OCTOBER 2001 That’s because other components play a big role in determining your system’s overall performance. For example, dwindling hard disk space or too little RAM can slow down a system that’s trying to process big spreadsheets or databases. And adding a topflight graphics card to your PC can dramatically improve the look and play of many games. But if you’re on a tight budget and you need a moderate, across-the-board performance boost, adding a new CPU can be worthwhile. Our rule of thumb: If you’re staying in the same processor class, buy a CPU upgrade only if it will at least double your current clock speed—from 400 MHz to 800 MHz, for example. Better yet, move up an entire CPU class, such as from a Celeron chip to a full-fledged Pentium II or Pentium III. If you have an older system, keep in mind that powerful new PCs are cheaper than ever. If a CPU upgrade costs more than $300, you may be better off spending a little more for a new PC. Here’s what you need to know about your PC before you buy a new CPU: What’s your old CPU’s name? Use Intel’s Processor Frequency ID Utility to identify the company’s CPUs. Go to find.pcworld. com/11880 to download the program. What’s your PC’s chip set? The chip set your motherboard uses determines what types of CPU, RAM, hard drive, and other hardware will work with your PC. To discover what chip set your PC uses, look in your system’s manual or download and run a hardware diagnostic program such What about your frontside bus and multipliers? The frontside bus (or FSB) is the path between your RAM and CPU. It runs at a particular frequency: 66, 100, or 133 MHz. The motherboard multiplies that frequency to drive the CPU. For example, a Pentium II-233 CPU typically runs on a motherboard with a 66-MHz FSB and a multiplier of 3.5. The same system can run a Pentium II-266 CPU if you change the multiplier from 3.5 to 4. But running a Pentium II-400 CPU on that system would be a waste: With an FSB of WHAT’S YOUR SOCKET? CPU Intel KIRK STEERS AMD HARDWARE TIPS as the HWInfo shareware package. Visit find.pcworld.com/11881 to get it. Does it use a socket or a slot? The type of CPU connector your motherboard uses determines which CPUs can connect to your system. FIGURE 1 lists information to help you determine what your PC uses. Motherboard attachment Pentium (75 to 133 MHz) Socket 5 or 7 Pentium (133 to 200 MHz) Socket 7 Pentium MMX Socket 7 Pentium Pro Socket 8 Pentium II Slot 1 Pentium III Slot 1 or Socket 370 Celeron (300 to 433 MHz) Slot 1 or Socket 370 Celeron (466 MHz or faster) Socket 370 (PPGA or FC-PGA) K5 Socket 5 or 7 K6, K6-2, K6-III Socket 7 or Super 7 Athlon Slot A Athlon (Thunderbird) Socket A Duron Socket A FIGURE 1: KNOW YOUR motherboard attachment type before you buy a CPU upgrade. 66 MHz and a top multiplier of 4, the old machine can run no faster than 266 MHz. What is the voltage? If you’re adding a standard CPU rather than an upgrade processor, make sure your motherboard’s CPU voltage matches the voltage needs of your new CPU. Some motherboards support multiple CPU voltage settings, but many older boards don’t. Check your manual to be sure of what you need. Kirk Steers is a PC World contributing editor. Hardware Tips welcomes your tips and questions and pays $50 for published items. H A R DWA R E T I P S KIRK STEERS Your PC’s Case: Enter With Caution every time you crack open your PC’s case to add or remove hardware, you’re rolling the dice. Maybe you’ll slip that new modem or ethernet card into its slot and watch Windows seamlessly install its drivers. Yeah, and maybe your Internet stocks will return to triple-digit share values, too—but I sure wouldn’t count on it. Even with such technologies as Plug and Play, hardware can still be quite tricky to install. Mistakes or problems can lead to hours of troubleshooting, or even to an unusable PC. These installation guidelines should help keep your system running. First, create a backup. Windows 98 automatically backs up its Registry files every day. By default it stores the last five backups in the Windows\Sysbckup folder as .cab files named rbxxx.cab, where xxx is the number of the backup— 001, 002, or whatever. Copy the most recent .cab file, and give it a different name so it won’t be overwritten by a corrupted copy. If you need to restore a backup file, restart your system in DOS mode and run regscan.exe—running it from a DOS session in Windows won’t work. Windows Me’s System Restore utility automates system backups. Click Start• Programs•Accessories•System Tools•System Restore to reload a system configuration that Windows saved previously. Last, make sure that you’re electrically grounded. Even a small static charge on your body can damage your PC’s delicate circuitry. Touch the system’s metal chassis just before you unplug it from its 190 PC WORLD A U G U S T 2 0 0 1 Reserve a Cab ABOUT THE ONLY time you need your Windows CD-ROM once your PC is running is when you install hardware. If you can’t find the disc, or if you can’t get your CD-ROM drive to work, you could be stuck. To play it safe, make a folder on your hard disk, name grounded outlet. it CABS, and copy Windows’ .cab files (the Always remove compressed versions of Windows operating all traces of the system files) to it. Just copy the ‘win98’ and old device before ‘drivers’ folders from the Windows CD. They you install the occupy about 275MB, but it’s space well new one. Here’s used, even if you only need the files once. what to do: Windows’ own installation routines. 1. Use the Add/Remove Programs applet 2. If the installation instructions are in Control Panel to remove all of the softunclear or refer to a different model numware associated with the device. ber, go to the manufacturer’s Web site 2. Remove the device’s driver. and look for updated documentation. Click Start•Settings•Control Panel• 3. Get the latest driver update. The drivers System, choose the Device Managon the floppy or CD-ROM that came with er tab, double-click the device’s the device may be out-of-date. Check the category, select the device you’re vendor’s Web site for newer versions. uninstalling, and click the Remove 4. Don’t interrupt a driver installation. button. Note: To remove the driver Stopping in midprocess can cause all of a graphics card (Windows calls kinds of trouble. If you want to abort an it a “display adapter”), first doubleinstallation, finish the procedure comclick the device name, choose the pletely, and then uninstall the driver. Driver tab in its Properties box, 5. Secure cards to the case with their fasand select the Update Driver buttening screws. Unfastened cards can work ton; then use the Update Device their way out of their slots over time. Driver Wizard to install Windows’ generic VGA driver (see FIGURE 1). For additional hardware tips, 3. Shut down your PC. visit www.pcworld.com/heres_ 4. Open your system’s case, and remove how. Send your tips and questhe old device. If you’re upgrading your tions to [email protected]. We pay graphics card, put the new one in now. $50 for published items. Kirk Steers is a 5. Restart the PC and check Device Man PC World contributing editor. ager. If the old device’s entry is still there, repeat the uninstall. Sometimes you have to “remove” a device more than once before there are no traces of it left in Windows. Install new devices one at a time, and use your PC for a few days between each installation to give problems time to reveal themselves. Some things to remember as you install: 1. Plug and Play isn’t always the best method for installing a device. Some drivers have their own installation programs that FIGURE 1: BEFORE INSTALLING A NEW graphics card, are best run independently of replace the old driver with Windows’ Standard VGA driver.