Author: Frank E. Oldham
Date: 05:37:03 04/24/98
Go up one level in this thread
On April 23, 1998 at 23:26:48, Robert Hyatt wrote:
>don't forget the good old pentium pro... it has a 256 bit bus between
>the
>L1 cache and the processor... -Ènice machine 2 years after it was
>introduced...
The 256K (and larger versions) cache is an L2 cache with a 64-bit
interface, just like Pentium II except it is full-speed (1:1 ratio with
processor). The L1 cache is 16K -- there is an internal 300-bit bus,
but all processor functional units share it.
(http://www.intel.com/procs/ppro/info/techdtl/factsht.htm)
Note that the PPC750 ("G3") chip used in the newest Macs is capable of
supporting 1MB of L2 cache at 1:1 ratio, you just can't buy one from
Apple -- a processor card with a 300MHz G3 with 1MB of 1:1 cache costs
around $2500 currently, though this is slowly dropping, and gives about
15-20% improvement in performance over Apple's 300MHz, 1MB at 2:1
machine.
A new chip that may make a great "chess processor" is the
Hewlett-Packard PA RISC 8500 (expected to appear in systems in the
second half of 1998), which will incorporate 1.5 MB cache memory on the
chip!!
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