Originally Posted by Crowgasm
just curious here and likely not your issue but where do you have your video cards seating on the mobo, s1 and s3 or 1 and 2?
Have you tried both cards solo in s1? Performance the same?
Have you tried a confirmed stable video card in both/all PCIe slots?
I had big problems with Crossfire in the past - first try with 4800s was a mess with BSODs and poor performance and then I tried with 5800s some time ago on a different PC with issues more like yours. Turned out one of the PCIe slots had a problem.
Just for peace of mind, it might be worth taking the time to go methodically through each hardware setup, card 1 in slots 1, 2 and 3, then card 2 the same and test performance. If you can be sure both cards are good in all slots, it would at least rule out such a hardware problem.
I was considering retrying crossfiring my MSI Lightning 7970's tonight but your thread might have put me off.
Thanks for the reply, Yeah I have tried them both in slot 1 and that is fine, they are sitting in slot 1 & 2., not tried 3, maybe I will, I think it might be working okay, not sure if it's just some games or what.. I could try slot 2 and 3 maybe I will at some point. Thanks for the tip.
I am running at 1440p so obviously it's going to take fps down a bit compared to 1080p. I just cannot get Splinter Cell to run well at all maxed out.. if I disable crossfire It runs better, but cannot max it out completely, I have to change ssao down or something. However it seems to run fine maxed out 1080p (single card, but it probably would anyway).
I'm certainly ruling out the power thing, they just wouldn't operate if it was that & I definitely get an increase in Tomb Raider with Crossfire enabled. The same with Far Cry 3 runs much better with crossfire... stutters still though, which I had with a single card.. and Diablo 3 runs better, So maybe it's just certain games.
I'm really hoping for a new driver release though, looks like I have to turn off v-sync for most games to get a good fps increase.