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The Xbox 360 uses Three 3.2 GHz PowerPC cores. They have a shared 1MB L2 cache, 8-way set associative. Each core features 2-issue per cycle, in-order, decoupled Vector/Scalar issue queue and 2 symmetric fine grain hardware threads. The PowerPC data streaming allows high bandwidth data streaming support with minimal cache thrashing. This is accomplished with 128B cache line size (all caches). To be clear, this is a customized version of the chip designed specifically for graphic intensive applications rather than workloads. David deLisi Microsoft Corporation -----Original Message----- From: midrange-l-bounces+daviddel=microsoft.com@xxxxxxxxxxxx [mailto:midrange-l-bounces+daviddel=microsoft.com@xxxxxxxxxxxx] On Behalf Of Steve.Hinrichs@xxxxxxxxxxxxxxx Sent: Tuesday, November 08, 2005 5:47 AM To: midrange-l@xxxxxxxxxxxx Subject: IBM Chip powers new Xbox Didn't Frank Soltis talk about this in a round about way? 200 engineers from IBM's Engineering and Technology Services unit worked on it. They started with the PowerPC core, the base chip for iSeries and pSeries servers, and revved up is processing speed. Then they coupled 3 chips together and pushed the graphics processing portion of the PowerPC chip to 128 bits from 64.
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