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Politics : Formerly About Advanced Micro Devices
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To: Monica Detwiler who wrote (96556)3/3/2000 12:33:00 PM
From: Joe NYC  Read Replies (1) of 1571981
 
Monica,

Does this not imply that the new 1 GHz Athlon will be a standard Athlon with off-chip Level 2 cache?
If so, won't that cache be running at only 300+ MHz - a mere one-third (or so) of the processor's 1 GHz speed?
How would you expect, if this is true, the 1 GHz Athlon to perform relative to Intel's 1 GHz Coppermine - with a smaller L2 cache, but a cache that runs at the full 1 GHz?

The latency of the cache is more important that the clock speed, and here is where Intel has an advantage, and higher the clock speed, the more important the latency becomes becomes. This because if the latency stays the same, and you have an L1 miss, it takes more clock cycles to deliver the data from L2.

But one thing that makes it less of a problem is that Athlon L1 is 128K, compared to 32 K of CuMine. But still, AMD needs to address the latency. It will be addressed by Spitfire and Tunderbird chips.

Joe
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