on 9/24/04 11:12 PM, [EMAIL PROTECTED] at [EMAIL PROTECTED]
wrote:
>
>>
>> From: Jeff Garrison <[EMAIL PROTECTED]>
>>
>> Mine seems to run a little faster with the cache out. Because the
>> Accelerator has a 1MB backside cache. Using a cache when no other is present
>> will guarantee a speed-boost.
>> Jeff G
>>
>
> Whats this ??? Now I'm really confused.
>
> You appear to be implying that the 233 Mhz 604e processor card I installed in
> the 7600 has a ONE-MEG backside Cache. I'm pretty sure that it has nothing per
> se and relied on the 512k Cache that was soldered into the 9600/233 Tsunami
> MoBo that I took it off.
> Am I confused about L2, L3 and backside Cache ?
>
> I just found a full ONE-MEG Cache chip for PCI Macs on the SWAP List for mext
> to nothing. I grabbed it to replace the 256k Cache chip on the 7600 MoBo.
>
> 'Zoo
>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
No, I was describing the contents of MY machine. It was just an illustration
of the effect of the 256k cache I had in the mother board slot, and the
effect it seemsed to have of slowing my Mac down.
Clark Martin indicated that the little 256k cache would not at all have been
accesed as the ZIF CPU has its own larger faster cache.
Placing a compatible one meg cache in your machine would undoubtedly improve
performance.
Level 1 cache. A small cache integrated in a processor that provides quick
access to the most recently used data.
Level 2 Cache. Memory cache that is between the CPU and the main memory. L2
cache can provide faster CPU access to instructions and data in memory, thus
increasing system performance.
Backside cache is used by Apple Computers, Inc. in their PowerPC G3
processor. Previous PowerPC processors used the system bus to access both
secondary cache and main memory. In the PowerPC G3 a dedicated bus handles
only CPU/cache transactions. This bus can operate faster than the system bus
thus improving the overall performance of the processor.
The term apparently derives from the relocation of the secondary cache from
the motherboard to the processor card itself, i.e. on the backside of the
processor card.
Jeff G
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