Easy question: cpu clocking on A7V8X-X

S

Stephen Boulet

I have an A7V8X-X motherboard and a 2700+ athlon xp. My memory is crucial
ddr-400.

I'd like to set it at it's rated speed. What should I put in for:

CPU Speed
CPU Frequency Multiple
CPU External Frequency
Memory Frequency

? Thanks and sorry for my cluelessness.

--

Stephen

If your desktop gets out of control easily,
you probably have too much stuff on it that
doesn't need to be there.
Donna Smallin, "Unclutter Your Home"
 
P

Paul

I have an A7V8X-X motherboard and a 2700+ athlon xp. My memory is crucial
ddr-400.

I'd like to set it at it's rated speed. What should I put in for:

CPU Speed
CPU Frequency Multiple
CPU External Frequency
Memory Frequency

? Thanks and sorry for my cluelessness.

http://www.qdi.nl/support/CPUQDISocketA.htm

It says 2700+ is 2167MHz and the bus clock is 166MHz.
CPU Bus clock * 2 = FSB = FSB333
Memory works best if matched = DDR333 (mem_clock 166MHz * 2 = DDR rate)

You can leave it at the defaults of "CPU Speed" [Auto] and
"Memory Speed" [Auto], and then check with

http://www.cpuid.com/cpuz.php

to see whether auto did the right thing.

If you want to set the stuff yourself, set CPU Speed to Manual,
then look for a CPU External Frequency of [166/33], as 166 is the
actual CPU bus clock. The 33 part is the proper value for the PCI bus,
and values over 37.5 for PCI aren't recommended. The FSB transfers
two pieces of data per clock, so the external frequency of 166
gives the FSB333 value. (Memory works the same way. A 166MHz memory
clock transfers two pieces of data per clock, for a DDR333 rate. You
have to distinguish between a BIOS entry that is a "clock" versus one
that is a "rate", as some new users end up trying settings which are
double what the hardware can handle.)

The multiplier on a lot of new processors is locked, and in this
case your processor is 2167/166 = multiplier 13X. If you try
changing it, check CPUZ to see if the change had any effect. If
you plan on changing it, there is much more to know about this
(overclocking research) than I can state quickly here.

Generally, matching the FSB rate to the DDR memory rate works
best, as the resync circuit in the Northbridge operates in its most
efficient way when they are matched. Running the memory at DDR400
and the FSB333 will net you very little, and on some boards
actually runs slower. To win by boosting the memory, the memory
would have to go much higher, before the gains would pay off.

HTH,
Paul
 

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