Custom IBM PowerPC-based CPU
* 3 symmetrical cores running at 3.2 GHz each
* 2 hardware threads per core; 6 hardware threads total
* 1 VMX-128 vector unit per core; 3 total
* 128 VMX-128 registers per hardware thread
* 1 MB L2 cache
CPU Game Math Performance
* 9 billion dot product operations per second
Custom ATI Graphics Processor
* 500 MHz
* 10 MB embedded DRAM
* 48-way parallel floating-point dynamically-scheduled shader pipelines
* Unified shader architecture
Polygon Performance
* 500 million triangles per second
Pixel Fill Rate
* 16 gigasamples per second fillrate using 4X MSAA
Shader Performance
* 48 billion shader operations per second
Memory
* 512 MB GDDR3 RAM
* 700 MHz DDR
* Unified memory architecture
Memory Bandwidth
* 22.4 GB/s memory interface bus bandwidth
* 256 GB/s memory bandwidth to EDRAM
* 21.6 GB/s front-side bus
Overall System Floating-Point Performance
* 1 TFLOP
http://hardware.teamxbox.com/articles/xbox/1144/The-Xbox-360-System-Specifications/p1