Microsoft Xbox 360

Microsoft Xbox 360
Kevin Mulligan, Maddison Hickson
Agenda
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History
High Level Architecture
CPU-Processor Specifics
GPU
Memory
Single Chip
Impact
Game Console Considerations
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Up front development
Slow release cycle
Support many years of games
Low console price
Consider simplicity of game creation
Gaming focus -> Entertainment Hub
History
● Successor to the Xbox (2002)
● Release Date: November 22, 2005
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83.7 Million sold, 1.5 Million in first quarter
● Competition:
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PS3
Nintendo Wii
Marketing/Business
● Target Buyers:
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Initially: Gamers
Later: Gamers/General public
● Extremely competitive market
● Microsoft pushed to release early
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Red ring of death
$1 billion dollar loss
● $3 Billion loss on hardware
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$126 loss per Xbox 360 at launch
Makes money through licensing fees
High Level Architecture
● Optimized for Gaming
● Flexible
● Simple
Processor Specifics - Overview
● Microsoft XPU (Xenon)
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Designed by IBM
PowerPC ISA
● 90nm Processes
● 165 Million Transistors
Processor Specifics
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3 Cores
3.2 GHz
L1 each core
L2 Shared
Processor Specifics - Cache
● L1 Split Cache
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Data
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32 KB
2-way set associative
Instruction
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32 K
4-way set associative
● L2 Shared
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1-Mbyte
Memory Bandwidth:51.2 GB/s
8-way set associative
Processor Specifics - Pipeline
● Two issue
● In-order execution
● Execution Pipelines:
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Branch, Integer, Load/Store
Unified VMX and Floating Point
GPU
● ATI Xenos
● 500 MHz
● 10-Mbyte eDRAM
o 256 Gbyte/s
● 754 floating point ALUs
o 32-bit
● FSB
o L2 cache reads
Vector Processing
● VMX SIMD vector instruction set
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128 Registers, 128bits each, per hardware thread
● CPU performs these calculations for the GPU
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25GB/s of bandwidth
Memory
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Unified Memory
512Mbyte GDDR3
1.4 Gbit/pin/s
Memory Bandwidth: 22.4 Gbytes/s
Input/Output
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DVD drive
Hard drive
Controllers
USB ports
Ethernet
Audio
Input/Output
● Video output
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Direct from GPU
Up to 1080p
● South Bridge Interface
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1GB/sec bandwidth
500MB Read/500MB Write
Single Chip Slim Design
● System-on-a-Chip(SoC)
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CPU
GPU
I/O
Lower Cost
Reduction of Size
More Power Efficient
No Performance boost
Success?
● Comparable sales to competition (~84 Million)
● 9 year lifespan
● Xbox 360 initially dominated sales
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In the end PS4 and Xbox 360 sold close to the same amount
Impact
● First mass-market, desktop-class processor, to include
SoC
● Predecessor to Xbox One
● Industry leading
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Multimedia
Programming simplicity
Available titles
Digital distribution of titles
Questions?
References
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https://www.cis.upenn.edu/~milom/cis501-Fall08/papers/xbox-system.pdf
http://arstechnica.com/gaming/2010/08/23/microsoft-beats-intel-amd-to-market-with-cpugpucombo-chip/
http://www.anandtech.com/show/1719/7
http://www.cdrinfo.com/sections/news/Details.aspx?NewsId=14842
http://techreport.com/review/8342/details-of-ati-xbox-360-gpu-unveiled
http://www.geekwire.com/2013/xbox-360-wii-ps3-won-console-generation/
http://www.vg247.com/2013/01/07/xbox-360-and-ps3-losses-total-8-billion-ex-sony-employeepaints-grim-future/
http://www.neowin.net/news/report-microsofts-xbox-division-has-lost-nearly-3-billion-in-10-years
http://www.gamespot.com/articles/microsoft-taking-126-hit-per-xbox-360/1100-6140383/