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7950 Crossfire Usage issues..
- Thread starter MOOGLEYS
- Start date
Blimey you must have a stinker of a card to require such high voltage for 1000 core. I think what you need to do is find out, individually what both cards need to do either 1000/1400 or 1050/1500.
If not maybe we can ask that chap to create you a bios with lower clocks. Test the card individually and find out what voltage you need for each card.
Use Unigine Valley and see if you complete the benchmark safely. If you do then test a game for 20 minutes. You might well need an extra notch of voltage to be game stable.
Can you try over volting the memory? I've not had much luck over volting mine. Elpida memory really is crap. Nevertheless try bumping the mem voltage up to 1.625v or 1.65v and see if it helps.
I think your going about oc'ing the wrong way with dual cards, you should always find the limits of each card first in single mode and go with the lowest clocks-though they can run on different clocks but it's easier if they are matched.
You don't need to remove cards btw, just switch off CrossFire and change the display cable to the bottom card and thats the one that will render.
Your vram needs more juice too by the looks of it, try matt's suggestion on voltage and push the power slider up to 40 if needed.
You don't need to remove cards btw, just switch off CrossFire and change the display cable to the bottom card and thats the one that will render.
Your vram needs more juice too by the looks of it, try matt's suggestion on voltage and push the power slider up to 40 if needed.
I think your going about oc'ing the wrong way with dual cards, you should always find the limits of each card first in single mode and go with the lowest clocks-though they can run on different clocks but it's easier if they are matched.
You don't need to remove cards btw, just switch off CrossFire and change the display cable to the bottom card and thats the one that will render.
Your vram needs more juice too by the looks of it, try matt's suggestion on voltage and push the power slider up to 40 if needed.
+1.
Luckily both my cards match in being distinctly average.
Well, i say average. Technically the stock clock of the 7950 is 800mhz, with boost thats 925mhz. Both mine will do 1150 maximum so 225mhz core overclock isn't too shabby i suppose.
Memory stock at 1250mhz. I've been as far as 1563mhz on both cards without problems so far.
All that will do is stop your card from down volting at idle. Are you saying that your card is not stable no matter how much voltage you put through it?
Crossfire has nothing to do with a poor clocking gpu. What you need to do is find out which gpu is the poor clocker. It might take you some time to figure out but if you want the best results that is what you should do.
Why don't you read my overclocking guide so you can find the max for the core and the memory of each card individually. Then you will have a better idea of where you stand. Slow down and take your time.
http://forums.overclockers.co.uk/showthread.php?t=18431335
Oh I'm sure this is solvable if I'm willing to invest hours and hours and hours. But that's the thing isn't it? I've actually used your ocing guide before (it was really useful) and have got them running at a stable oc. It's just the core fluctuation that I can't seem to stop.
Think I'm going to simply get rid of the pair and invest in a single good GPU.
But like I said, I'll try a lot of the tweaks you've recommended tonight and see if I get anywhere.
Think I'm going to simply get rid of the pair and invest in a single good GPU.
But like I said, I'll try a lot of the tweaks you've recommended tonight and see if I get anywhere.
Boost should be disabled though. Are you sure you flashed the bios correctly?
If you set up msi on screen display correctly you can monitor gpu usage for both gpu's, core voltage to see if its boosting, temps etc. Enable it and play some games to monitor. Have you disabled ULPS as well? That's essential to do if you're overclocking on crossfire.
Yeah, did that a long time back. I think I might have confused you a bit - I was saying that i was getting a perfectly smooth OC prior to the bios flash. The only problem I had with the cards before any of this were the occasional boost spikes. Post bios updates it's now freezing and crashing. Apols.
Go back to the old bios then and use the 50% power tune that will solve the boost spiking.
30% will be enough to get rid the spiking, even with a large overclock.