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To: Charles Gryba who wrote (87444)	8/22/2002 9:16:37 AM
From: Joe NYC	Read Replies (1) \| Respond to of 275872

C. Is this saying that if you don't use x86-64 you will only get a 5% IPC improvement? I am not sure, but I think it just relates to 64 bit code, ignoring onchip memory controller and improvements in L1/L2. The 5% IPC improvement is probably from increased paralellism and improved branch prediction, 15% from reduced instruction count. I think there is going to be an improved IPC on 32 bit code, which includes the 5% IPC improvement due to increased parallelism and branch prediction + improvements due to improvements in L2 / onchip memory controller. Joe