max memclock setting in bios

[frankierx]

how do i run dividers in bios? in bios it says max memclock (Mhz). the choices are : auto, 100, 133, 166, 200. Which do i pick for a 1:1 ratio? I'm about to pick auto.

 

[SrGuapo]

I am wondering the same thing. I wanted to set a divider for my mushkin value RAM (so I can get the CPU a bit higher), but even if I set it to 200, CPU-z reports it as 240 MHz (250 currently, but I'm getting errors in prime, so I'll back it off again.

 

[BigBadBiologist]

Since A64s run at 200FSB, the 200RAM speed is 1:1. It is the same thing as setting a divider. There is a chart somewhere that shows what the values are at each divider at different FSB (or HTT whatever you want to call it). I'll try to find it.

 

[frankierx]

I'm getting memtest86 errors now that I set memclock at anything above 100. I have to run at ddr-278 inorder to get stable readings at 278x9= 2.5Ghz . This is even at 3-4-4-8 1T. Any suggestions? I'm alrdy thinking of RMA'ing my Patriot XDL ram back to newegg now in exchange for Corsair Value Ram.

system : A643000+ .90nm oc'd as above.
Vcore 1.55
Vdimm2.8
Vchipset1.65

 

[BigBadBiologist]

most AMD chipsets require you to run at 2T command rate to get to 200 MHz RAM speed. So if you have your RAM set to 100MHz (2:1) and your FSB (HTT) is 278, then your RAM is really running at 189MHz. Try lowering the command rate to 1T and your problems may go away.

 

[frankierx]

It's been always at 1T.

I took out the Patriot XDL ram and am rma'ing back to newegg. I put in the corsair xms and everything works fine and better at ddr-370 2.5-3-3-6 1T . I'm still got the corsairs on ebay for sale here Corsair XMS Extreme Memory Speed Series(512MBx2) pc3200

I plan on buying corsair value ram to oc with ddr-370.