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- CPU-z question / MSI Diamond SLI
March 19, 2005, 1:17 pm
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Just a quick question....
I have clocked my system to HTT (FSB) 250mhz x 4 HT and 10.5 x 250 (AMD A64
4000) which is fine and the BIOS shows the mem frequency as 250MHz giving me
my 1:1 ratio - all good. However, if I use CPU-Z it shows my mem frequency
at around 236mhz....I'm baffled, any ideas?
AMD A64 4000 @ 2650
2x512 Corsair xms 3200 C2XL @ 250mhz (1T)
MSI K8N Diamond SLI (with latest BIOS)
2x Gigabyte GF6800 ultra's @ 425/1100
win xp pro (SP1)
Re: CPU-z question / MSI Diamond SLI
1:1 ratio on half-integer dividers doesn't work as might be intuitively
expected on A64s. What the CPU does is divide the CPU clock by an integer to
get the memory controller (ie memory bus) speed, such that the memory speed
is not ABOVE what it should be.
In you case, your CPU speed is 2625MHz. Ideally you want a 10.5 divider,
except it must be integer, so an 11 divider is used to get 238.6MHz. If a 10
divider was used then the memory speed would be 262.5MHz, above what it
A little app I've written:
will give you the numbers, and the documentation in
should give you a good idea of how things work.
www.emboss.co.nz : OOS/RSI software and more :)
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