Hi Bob,

        I have been looking into the same subject about my FX chipset.  I believe
it goes like this:
        L2 cache caches information from main memory, that it (L2 cache) expects
the the processor to need next.  Caches work very well and speed up the
execution of any code.  For L2 cache to work it must be able to
know(handle, utilize, etc) the address of any location in main memory.  If
the chipset can only utilize addresses up to 64 MB, then main memory above
64MB is not cached.  And since L2 cache runs in the 7-12 nanosec range
while my main memory EDO runs in the 60 nanosec range it is for certain
that uncached main memory above 64MB will be slower than cached main memory
below 64MB.

        My question is: since my HD access is around 12ms, isn't uncached main
memory better than virtual memory?  So why not 80-96-128MB even though only
64MB are cached?


Tom Kelly

----------
From: `bob boyd <[log in to unmask]>
To: [log in to unmask]
Subject: Re: [PCBUILD] CPU & Motherboard
Date: Thursday, February 19, 1998 4:35 PM

Ok so I have a Shuttle P5 with the TX chip set and a K6-200.  I'm running
NT4.0.
I currently have 2 ultra ide drives and 64mb edo simms. I was getting ready
to order 2 10ns 64mb DIMMS. I'm looking for a improvement in Photo Shop
performance and less swap file utilization. Can someone expand a bit on
this 64mb max thing. Am I stuck with 64 unless I get a new board?