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6970 Crossfire trouble

S

Starslayer67

Weaksauce
Joined
Aug 17, 2010
Messages
68
My new pair of 6970's is giving me some trouble. I'm getting low framerates in some of the games I've tested so far compared to what you would expect even from a single 6970. Both DiRT 2 and 3 are running sub-60 FPS, when they should be screaming far above that if I turned Vsync off (I've noticed no difference with it on or off). Clear Sky and Crysis at least also show this behavior.

Both RadeonPro and GPU-Z show that the second card is being used at about half the level the first is (roughly 50% compared to 100%). If the game isn't very graphically taxing, like HL2 or Stalker, it'll run at 60 FPS (Vsync on), but as soon as the second GPU is used beyond a certain amount, it throttles down and stays at about 50% usage. It's not a temperature issue (my cards haven't risen above 75-80 C), and I don't think it's a power issue. All of this is at 1920x1200, by the way, which makes it all the more strange.* I am using the latest drivers (Cat 11.6 and 11.6 CAP 1 profiles) as well. All other system specs are in my sig.

So, my question is simple: What is causing the second card to throttle so badly? It doesn't get hot, it has plenty of power (my meter reads the total power draw including speakers and monitor as 450-500 W; even allowing for a large 200 W safety factor, my PSU should handle it fine), and Crossfire is enabled in the CCC.

*I know that twin 6970's are total overkill for that res; once I get a mini Display Port adapter on Monday, I'll move back to my usual 5760x1200 setup.
 
Well, I'm back at Eyefinity, and the problems keep coming. Whenever I switch around Eyefinity options or exit a game, explorer crashes and restarts. At this point, I'm wondering if I have a bad card or there's a hardware conflict somewhere.

Eyefinity performance is also terrible; I don't get more than about 10-15 FPS in any game I've tried so far. HL2 simply hard crashed on launch, completely trashing my display - what is going on here?
 
Sorry, I don't know the answer to your question, but I do have one bit of advice. Seeing as how nobody has responded yet, I would post this in the AMD section. You'll probably get a lot more views from AMD users who can help you out there.
 
I have somewhat the same setup. I found the best thing to do is in CCC set everything to application controlled, set the sliders to performance and uncheck all the extras. See how things run then go from there. Start moving the settings higher until you hit the frame limit you're willing to play with.

That's what i did and am happy with the results.
 
I'd first uninstall all the drivers for the card. Do a CCleaner run through, then reboot. Install the drivers again, and see if there's any differences. If not, pull 1 card and see what happens.

You might have a faulity CF bridge, a bad card, or other issues, but first things first, lets blame shitty drivers and go from there ;)
 
I'm pretty sure it isn't the drivers this time. I've tried almost the entire 11 series and the 10.12's, with a registry clean and a Driver Sweeper run between each install. The 10.12's just caused crashes all the time, while the 11's give roughly the same experience across the board (I've got the 11.6's installed right now). Explorer's stopped crashing all the time when I switch my Eyefinity options, but I should have thought of simply testing each component one at a time. I'll get around to that tomorrow. I just got a physics degree, you'd think I remember how to do a controlled experiment... :p
 
are you using a bridge connector?

Also you need to make sure you have the latest cap installed.

I know you are using a 1366 chip but does your motherboard have enough PCIe lanes for both cards? Run GPUz and see what they are running at speed wise.
 
I get insano massive FPS in games I play with crossfire. With 2 cards I was getting 130fps avg in Crysis 2 everything maxed and 189 avg with 3 cards.

Some games are not supported and crossfire will NOT work at all like wow.
 
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