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7950 Crossfire Usage issues..

MOOGLEYS

MOOGLEYS

MOOGLEYS

Soldato
Joined
24 Dec 2004
Posts
19,363
Location
Telford
I have just installed a pair of HIS 7950 Boost cards as I fancied having a play with a crossfire setup but I'm having quite bad usage issues I cannot seem to fix.

I have run crossfire 7950's before and do not remember getting these issues so I'm hoping its a driver or setup issue.

What happens is anything I run my cards usage jumps all over the place on both cards. You can see when this happens in game as the FPS drops quite a bit. I have been using MSI afterburner to monitor the usage.

I have tried the latest Beta drivers and the WHQL drivers and both give the same results. I have installed a GTX 690 which both cores stay above %98 at pretty much all off the time.

I'm not really sure what else to try and was hoping someone would have a fix or has had this issue with some advice.

Cheers...
 
No I'm using a 4.6ghz 2500k and a Z68 Gigabyte board which runs PCI-E 2.0 @ 8x8, 16Gb 1600Mhz DDR3.

I have had 7950 crossfire before a pair of xfx cards and did not notice this problem and had no performance issues.

It's a bit weird.
 
It's happening in just about everything. Tomb raider runs great until the usage on one card drops to under %60 causing a juddering on screen. It makes everything you play feel very unstable there is no constant framerate.

Both Heaven 4.0 and Valley do the same as does 3D mark. Furmark shows it the worst with huge drop off's into the %30 range.

I have tried everything I can think off even swapping one of the cards for my 7970 and still the same happens.

Removing one card and running with just one gives a lower FPS but a much smoother game. Individually both cards run as expected.
 
Both cards are at stock and seems stable. I will give them a better individual test to confirm.

This is a clean install of Windows 8. I have an AMD drive and an NVIDA drive :D

The usage seems to drop up and down on both cards not just one. I have now set them to AMD stock and will see what happens as these are Boost cards with a 925mhz core.
 
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Will try another bridge and see how that goes. Is fitting both advised ?

I only have 2 slots on this board. I did swap the cards over but this made no difference.

What drivers are you using, any cap files installed?
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I have tried the latest Beta and the WHQL ones 13.1 with and without caps and had the same results.

I have a Win 7 install on a drive kicking around I think I will try that as well.
 
Just tried a different bridge on the second set of connections and its still the same.

Just going to try a complete driver uninstall and driver sweep with a re-install and see if that does anything.

It's annoying as I had crossfire 7950's running fine before and nothing has changed apart from the brand of cards.
 
Drivers cleaned and re loaded and still the same. Changing the crossfire bridge I noticed one of the cards fans is making a horrid buzzing/Rattling noise so that will need to be RMA'd. :( The fan is doing it's job but compared to the other which is silent it sounds horrid.
 
Just tried my Win 7 drive and it's still the same. I'm really lost as what is causing this.

The FPS is up and down on both cards which causes stuttering and in tomb raider a horrid rubber banding effect where the game seems to slow then catch up with itself.

I have even now connected both cards to a different PSU just to rule that out but it makes no difference.

Something is not right and I have no idea what it is.
 
Rossi~ said:
It's good (for me lol) that i'm not alone. I've tried pretty much everything Google finds, but to no avail.
Hopefully we can find the cause/s soon.
Click to expand...

I have no idea what is going on.

I have just tried a pair of 680's both superclocked editions and it holds %99/%100 usage on both constantly in furmark.

With these HIS 7950's it jumps all over the place dropping down to %8 and everywhere inbetween. The only thing left is that one or both of the cards are faulty ?
 
I have given up. The faulty card with a dodgy fan is going to be RMA'd and the other I will DSR and get a refund. I have wasted an evening trying to get these going and it's not happening for whatever reason.

I have thrown in the towel on these cards..
 
spoffle said:
Which cards are they specifically? I've got 2 HIS cards and they work exactly as they should.

Is it possibly that these are boost editions and the boosting is messing up causing this to happen?

A BIOS flash could be a resolution.
Click to expand...

They are HIS 7950 ice-q Boost cards.

Tbh I have had enough they have depleted me and I have no love for them now. They should work as advertised without the need for bios flashing.

I will return these and ponder over something to replace them with.
 
Thracks said:
Is the GPU usage falloff matched by a corresponding falloff in GPU clock, say to 500MHz or less?
Click to expand...

Hi there

I did not notice any GPU clock Falloff tbh just the usage being all over the place across both cards. It was up and down like mad and unable to keep a constant level even with the cards at stock 7950 clocks.

I have boxed them back up now for return as one of them has a really noisy fan that was getting worse.
 
Just to add more confusion I have this morning borrowed a pair of reference 7950 cards and these are now in my pc running crossfire and the usage is staying above %98 with no drops or crazy fluctuating FPS.

There must be something with either these HIS cards or the Boost bios that is causing them to go crazy when in crossfire. Even setting them to stock 7950 clocks did not fix the problem so tbh I have no idea. I have asked for an RMA for the card with the dodgy fan and will DSR the other and look for something else.
 
Just tried a HIS Boost card with one of these stock cards and it does the fluctuating usage and FPS issues again. The fan on this card has now completely died and just clicks when you spin it. :confused:

I'm going to try the Good HIS card with a stock 7950 and see what happens.
 
Same issue with the good card and a reference card. Usage is all over the place and the FPS jumps and rubber bands.

It seems these cards with the boost stock bios will not run in crossfire.
 
My cards have an Asic of 62 & 61 and the working card happily sits at 1200/1600 without any voltage adjustment and remains under 75.c. The fan makes a horrid whining noise though even at idle. So I have one card that the fan does not work at all anymore and one where it whines, great quality control by HIS.... :(
 
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Just done a heaven run with the card at 1275/1650 stock volts and it was fine. It is hitting 80.c though.

This card need an Accelero... :D
 
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