Overclocking (2) 3870 X2's

[Psychoholic]

Been trying to get dual X2's overclocked, its getting a little frustrating.

What do you guys use? I tried rivatuner, and AMDGPU Clock tool.. cant get either to clock all gpus, rivatuner says it does, but the clocks on the 2nd card go back to like 297Mhz when i click apply.

OS is vista 64bit.


I havnt tried atitool yet.

[cdawall]

mine does the same thing when you click apply in rivatuner bios mod them is the only way i have been able to oc my cards correctly

[mrw1986]

My 3870X2 and 3870 CrossFireX setup does the same thing.

[driver66]

mine does the same thing when you click apply in rivatuner bios mod them is the only way i have been able to oc my cards correctly

Yes you will more than likely have to mod the cards bios's ;)

[FelipeV]

If you want overclock a X2 the only option is AMDGPU Tool, it overclock all cores, riva does only on one core.
A friend of mine did a bat to run at startup to apply the clocks at start.

Example:

start D:\AMDGPUClockTool\amdgpuclocktool.exe -I=0 -ENG=875 -MEM=1000 &
start D:\AMDGPUClockTool\amdgpuclocktool.exe -I=1 -ENG=875 -MEM=1000 &

C:\Users\"user name"\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup

For two X2 just add another line with -I=2 and -I=3 for the other GPUs.

If you dont like at startup, just use the bat.

[erocker]

FelipeV is correct. See if any info here will help. Scroll down to where it says 3/31/08 Update!
http://www.xcpus.com/forums/graphic-articles/11566-overclocking-hd3870x2.html#post165255

[Psychoholic]

Thanks guys, i have tried gpuclocktool, but i didnt use the syntax listed above, i'll try that tomorrow, hope it works :)

[dark2099]

Your other option might be try to find a stable over clock on one of the cores, or both cores and flash the BIOS for each core or card (don't know exactly how that is set up) to the clocks.