3870 x2 + 3870 crossfire overclocking

[necron66]

Added a 3870 to go with my 3870 x2 today, even went and got vista ultimate 64 to have the crossfore X support in cat 8.3.

CCC says crossfire is enabled, gpu-z says it's disabled.

Running everything at stock speeds 3D 06 score is the same as it was before I added the 2nd card, while 3D 03 is 11K higher than previos stock runs.

My bigest problem is before I was using atitool and amd gpu tool for overclocking and it worked pretty well. But this method wont work for x2 and single gpu card. At least I can't get it to work.

Rivatuner only allows me to adjust the fan speed on 1 card.

So basicly I ned to know how to get the clocks up and fan speed up on both cards.

Also will it matter which card is in which slot?

[darkorb]

i dont think u can crossfire a X2 and a single card..

[necron66]

i dont think u can crossfire a X2 and a single card..

I just had a look on 32bit Vista and it seems to be enabled.

[AresOlSkool]

i dont think u can crossfire a X2 and a single card..

No you can, you can do 2 cards, 3 cards or 4 cards, and as long as the cards are within the same GPU family you can CFX them, like a 3850 with a 3870 if you so pleased. At least that was my understanding reading the release notes from ATI.

[DaMulta]

No you can, you can do 2 cards, 3 cards or 4 cards, and as long as the cards are within the same GPU family you can CFX them, like a 3850 with a 3870 if you so pleased. At least that was my understanding reading the release notes from ATI.

Yep, and with the early beta leak look. 3 GPUs scaled better than 4 of them did.

[jimmyz]

absolutely can I am running a 3870 x2 and two 3850's right now. hybrid x-fire!! try that on the other brand..lol

[darkorb]

Oh wow, and it actually works fairly well?

Might have to look into that

[TheScavenger]

I hope you get everything worked out. I am really interested in seeing some benchmarks.

Good Luck, Josh

[necron66]

It works fine, that said I had to upgrade to vista also so I'm on a crash course learning vista also.

I managed to get some overclock using AMD GPU Tool last night, but as always the 8.3 driver crashed and did the recovery thing. I even tried to leave the 3870 on it's default clocks and run the x2 just under what I know it will clock to, and still the driver crashed.

I hope you get everything worked out. I am really interested in seeing some benchmarks.

Good Luck, Josh

I havent done a lot of benching yet, still trying to get the overvlovking sorted. Here is what I have so far.

3D 06 with cards at all stock I beat my PB by 1000 marks. http://service.futuremark.com/compare?3dm06=5599724

3D 03 I beat my PB by over 13k http://service.futuremark.com/compare?2k3=5760436 , again with stock cards.

Those 3D runs was with a Q6600 @ 3825mhz, 2gb PC8500 @ 566mhz and both cards not overclocked.