I don't know that you would want 1 meg cache on those machines. I've seen benchmarks where 1 meg cache is actually slower than 256 or 512k.

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Perhaps you are thinking of the effect of the disk cache settings control panel? In that case, there is an optimal range. But that's different from a hardware cache module that does its thing invisibly. The disk cache setting involves the OS as an intermediate agent, which is why bigger is not always better in that case. But a hardware cache module? Bigger is better there.