I'm running two 7870's in my build with eyefinity, with battlefield 3 @ 5760x1080. With this, i get about 10 fps on average. But when i turn off crossfire, I get about 40 fps. I'm not running THAT slow of a card that microstuttering can be causing such a drastic effect of an average drop of 30 frames. anyone have any ideas on what this could be?
Do you have a CF bridge and are you running the newest driver, Catalyst 12.6a, and if so, do you know for sure that you uninstalled any and all previous drivers completely?
Also, as suggested by fantastik250, check the PCIe slots that you're using. One of them might be a PCIe x16 slot physically, but is a PCIe 2.x x4 slot electrically. Your motherboard might also need a BIOS update.
Alright, so the old RC drivers don't like BF3. However, we still don't know enough about the situation to know for sure that this is even the problem and if it is, then a simple driver update should solve it.
Well i will not even comment on the track record... what do you want me to say? sheep fly?
Look at AMD now... not releasing drivers until they are suitable for release... say much?
Nvidia are not perfect, but that is not at question.
As a proven track record of yourself, you defend AMD to the end, i do that to a 480.. but not the rest of the lineup, think about that.
Let's end this now, as this thread is now littered with our retarded argument.
Carry on with this in PM's if you like, i will just block you however
AMD not releasing drivers monthly? Well, considering what AMD plans on doing is exactly the way that Nvidia does it... Well, if you don't like it, then you don't like Nvidia's driver release strategy either because they are one and the same.
@OP Have you tested both cards individually? One of them might have a problem and might need an RMA if the possible fixes that others have mentioned here don't work.