CPU Data Streaming
During read Streaming into the CPU, a custom prefetch instruction, extended data cache block touch (xDCBT) prefetches data directly to the L1 data cache of the intended core, skipping putting the data in the L2 cache to avoid thrashing the L2 Cache. Writes streaming from each cores skip the L1 cache, due to its no write allocation (avoids thrashing of high-bandwidth transient write only data streams on the L1 cache), and goes directly to the L2 Cache. The System allows for the GPU to directly read data produced by the CPU without going to main memory. this specific case of this data streaming, called Xbox procedural synthesis(XPS), the CPU is effectively a data decompressor, generating geometry on-the-fly for consumption by the GPU 3D core.
Read more about this topic: Xbox 360 Hardware
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