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7950 Crossfire Help

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Joined
28 Sep 2008
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287
Location
Bristol
Hi
Sorry to post a help me thread. But im struggling with my setup.

Ive been running a single XFX R7950 DD Black Edition for a while now. I play mainly BF4, on mixed settings to get around 120 fps. Lately this has taken a nose dive.
So i thought id grab a second identical card, and crossfire them.

Im getting terrible FPS, not only in BF4, but Heaven Benchmark too. I scored more with my old single card!

Could this all be down to my Motherboard ? Is my slot speed causing this ? Ive done a render test in GPU Z, which showed
PCI E 3.0 x16 @ x16 3.0
PCI E 3.0 x16 @ x4 2.0

Motherboard is Gigabyte GA-Z77-D3H

Does this mean both cards are running at a lower bandwidth now ?

In my attempts at a solution, Ive swapped cards around, and run both individually. The 'new' card, scores almost half of my old card on its own ? Despite being in the same 16 slot. Though i can clock it to higher speeds than my old one. I cant figure why this new card would be worse than my old one ? Id have thought if it was faulty, it wouldnt work, or would crash / artifact etc.

If the motherboard is the problem, whats my best option for replacing it with a reasonable one that would enable the best speed crossfire.

Or should i just forget all this and get a new card at some point.

Ive tried latest drivers for gpu, mobo etc, as well as beta. Also disabled ULPS.

Rest of system is 3570K, 16GB Corsair DDR3. So dont feel i need to upgrade the whole lot yet.

So its either fix this issue, buy a new mobo if thats the issue, or buy a new current card and sell both of mine.

Thanks for your time and help.
 
Last edited:
Just seen you say GPUz is showing both lanes @pci 3.0 well pci 3.0 4x = pci 2.0 8x so don't think it would be that. Can you run some benchmarks like heaven?
 
Thanks for the comments guys.

Reading what GPU Z has said

PCI E 3.0 x16 @ x16 3.0
PCI E 3.0 x16 @ x4 2.0

I think its saying im running at x4 speed and 2.0 on second slot ? Not x4 3.0 ?

Mickeyflinn - That motherboard is the same as mine ? Or does the X denote it has faster lanes ?

Some heaven scores are as follows..

Original card only - 1710 (67.9 fps) + 1726 (68.6 fps) at different times.
New card only - 980 (38.9 fps)
New card primary slot, old card secondary - 1663 (66 fps) + 1664 (64.9 fps)
Old card primary, new card secondary - 1726 (68.5 fps) + 1757 (69.7 fps)

Right now, im obviously a bit miffed that ive seemingly wasted money.

I had a quick look at the R9 290, but seems thats based on the card i have anyway ? Or the 7970 ?
So would it really be a huge boost over my original card anyway.

If i got a motherboard with better speeds lanes, what fps would i expect to see ?

Or is this second card just junk ? And forget about it.
 
Sounds like there is a problem with the new card.

Identical card in same slot as old and it only gets 1/2 - that does not sound right. It is clocking up to full speed etc?

You say that you have tried all different combo's - what was happening when you ran new card in slot 1 with the old card in slot 2 ? What was your scores like? - Whoops - should have read all the posts - ignore this? !!

Lastly - sorry for the scattergun approach - are you running riva and in heaven what does it show each gpu is running in crossfire?
 
The motherboard i specked runs at x8 x8 which is better than the x4, but you seem to be experiencing a greater loss in performance than stated in the article so im not sure where the problem lies .

What psu do you have ?
 
Hi

Yeah I'm thinking the card must be faulty too. Just not seen a card work fine, but at reduced speeds.

I'm not running riva or anything.
BBoth cards clock to I think 925 off the top of my head. I've seen this by quickly alt tab out and checking in CCC, the second cards soon drops down to 300 as I'm not longer full screen in a game or whatever.
I've disabled ulps
 
A Corsair HX1000.
And I'd think that would only affect maybe crossfire, if it couldn't cope.
It's been running 1 card, so can't see why an identical card in same slot, with same cables would not work properly.
 
I'll have to recheck when I'm home, but about 60-70% rings a bell.

What's the best way to tell, I just looked in CCC, but by the time I alt tab to it, it's obviously clocking down. So probably not accurate.
 
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