[RC5] clocks / key differences

Colin L. Hildinger colin at ionet.net
Thu Nov 11 18:26:08 EST 1999


Pentium MMX uses an MMX based bitslice routine that is faster on that
particular processor.  K6-X processors don't run this *particular*
routine as fast as the Pentium MMX.  They don't even run it as fast as
the non-bitslice routines which, IIRC, are heavily dependant upon ROTL
which is only implemented in microcode on the K6-X processors and is
not implemented in the core.  Such is life.  Thus, one very small
routine *is not* a good processor benchmark.

On Thu, 11 Nov 1999 15:32:09 +0100, Dennis Lubert wrote:

>Does anyone know how many clocks per key the AMD-K6-III needs ? My 200MHz
>MMX needs ~ 463 c/k (keyrate 432000 k/s --> 200 000 000 Hz / 432 000 ~=463)
>but my K6-III @ 450 MHz has a keyrate of 764000 k/s that would result in
>(450 000 000 / 763 000 ~=)590 c/k !!!!Shouldn't the (newer) K6-III have a
>better rate than this ? Or is there something wrong with my PC ? DO I
>normally need to have a keyrate of ~900 000 k/s ? 
>
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-- 
Colin Hildinger
Design Engineer
Enviro Systems, Inc.

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