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Crossfire problems : Please help

HEADRAT

HEADRAT

HEADRAT

Soldato
Joined
18 Oct 2002
Posts
21,499
Location
Cambridge, UK
Hi,

I've flashed both cards (HIS HD 7950 ICE Q BOOST) with the BIOS to remove the "boost" but if I enable Crossfire any game hard locks within about 1 minute of starting (850W Corsair PSU so plenty of power)

Crossfire is definitely working as the status icon is displayed, also framerate is greatly improved until the lockup!

I've tried both 13.12 and 14.4 but they both do exactly the same!

If I disable Crossfire the games play fine, no lockup, no crossfire status icon, reduced framerates.

Specs are-

Intel Core i7-2600K 3.40GHz
2x HIS ICQ-7950
Corsair HX 850W
Gigabyte P67A-UD3-B3 Intel P67 Chipset
G.Skill RipJawsX 16GB (4x4GB) DDR3 PC3-12800C9 1600MHz
Corsair H70

currently everything running stock.

Anybody suggest anything, were I might be going wrong etc?

HEADRAT
 
By any chance is the corsair psu 850hx version? When I first got into crossfire I had hx psu and that would crash also.
Edit
I see you do have hx version. It's a semi modular psu to stop the cards black screen I had to change the psu pci-e power cable for one out the bag.
 
Last edited:
Did they run ok with the normal bios?

Do you use msi afterburner to log usage/temps etc?

Hard lock after 1 min could be a ram "leakage" problem...had it in ghosts myself.

Check in taskmanger how much ram is being used....mine rose shrply to 7+gb then it was a slide show.

What games do you play?

Side note but a wee overclock on the 2600k will make a big diff with those cards :)
 
Uncle Petey said:
Do you still have the stock bios on the other switch, and if so, have you tried it?
Click to expand...

Yes, the work fine individually but not in Crossfire.

shankly1985 said:
By any chance is the corsair psu 850hx version?
Click to expand...

Yes, it's a Corsair 850HX, I'm hoping that isn't the issue :( I'm running 1 card off the 2 PCI-E blue connectors on the PSU, the other card off the spider cables that come directly off the PSU.

Hardlock is in every game I've tried as well as things like Heaven Benchmark, I thinks it's a systemic issue rather than being isolated to one game.

Yep MSN afterburner shows usage on both cards and temps OK.

Running everything at stock until I can get Crossfire sorted, normally running at 4.5Ghz ;)

Many thanks for the input, I've tried lots of things and coming to the end of what I can think of now, I'd never considered it being an issue with the PSU as I thought the Corsair HX850 was a good/quality bit of kit well able to run 2 x 7950s in Crossfire. Loathed to buy another PSU just to prove that theory right/wrong!
 
Last edited:
HEADRAT said:
Yes, the work fine individually but not in Crossfire.



Yes, it's a Corsair 850HX, I'm hoping that isn't the issue :( I'm running 1 card off the 2 PCI-E blue connectors on the PSU, the other card off the spider cables that come directly off the PSU.

Hardlock is in every game I've tried as well as things like Heaven Benchmark, I thinks it's a systemic issue rather than being isolated to one game.

Yep MSN afterburner shows usage on both cards and temps OK.

Running everything at stock until I can get Crossfire sorted, normally running at 4.5Ghz ;)

Many thanks for the input, I've tried lots of things and coming to the end of what I can think of now.
Click to expand...

Has this been working fine before? See my post I edited it.
 
I've only just got the second 7950, maybe I should try running the two cards off the blue connectors on the PSU, I'll try and find a piccy.
 
HEADRAT said:
I've only just got the second 7950, maybe I should try running the two cards off the blue connectors on the PSU, I'll try and find a piccy.
Click to expand...

Yeah
I had one gpu running of the cable built into the psu working fine. I then added another gpu and used the other two power cables and started getting crashes. I then tuck another two cables out the bag and used them on second gpu and it worked fine.

Tbh you not the first person I have seen with problems with multi gpu and this power supply.
 
Can you just confirm that you have tried them with the stock bios in xfire, not just individually? Sorry, I think you already did, but I'm tired :)

Other than that, I guess testing them with another psu if possible is the next step...
 
If I set the jumper on the card to position 2 my machine won't boot!

I had some success last night with "underclocking" my cards, if I set to 800 Core and 1000 Mhz Mem I don't get a crash!
 
tried completely removing the drivers then reinstalling? when i went crossfire with the same cards i had to do that and i also was pushing the card up to much when screwing it in to position and that caused me crashes.
I am on windows 8.1 64.
 
time to get silly, have you tried another Crossfire Bridge? doubt very much this will be your cause but it's a 10 second test. Simple things first.

You say your cards are fine when they are running on their own, so clearly it's not an issue with either card. Like others have already pointed out, if you can try a different PSU do it. And reinstall your drivers via DDU which I'm guessing you've already done.
 
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