Two Radeon R9 270x issues with crossfire.

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Q

qualsa

Reputable
Mar 17, 2015
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4,510
I purchased an additional R9 270x so I could run Crossfire on my PC and I've been having trouble getting it working. At first Crossfire wouldn't show in CCC, so I switched the cards round and it's now there, then after a reboot it once again disappeared. I've checked in GPU-Z and the first time the first card was running at x 16 and the other at x 1. After switching them round they are now running at x8 and x4, shouldn't both be running at x16? I checked the AMD site and the FAQ says they both need to be running at x8 for it to work effectively. Any ideas what could be wrong with this?

Thanks.

System:

2x Radeon 270x
Asus P7P55 LX
Intel Core i5 760
Corsair CX600M
4 GB DDR3
 
Solution
Calculagator
Running at x4 and x8 is probably the best you can do with your motherboard. You have to read your motherboard specs to know just how it will respond. I wouldn't worry about it. You aren't maxing out bandwidth with 270xs anyway. Sometimes, also, GPU-Z will only show what is currently being used and not the full speed that is available.
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Calculagator

Calculagator

Admirable
Nov 18, 2014
2,508
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Running at x4 and x8 is probably the best you can do with your motherboard. You have to read your motherboard specs to know just how it will respond. I wouldn't worry about it. You aren't maxing out bandwidth with 270xs anyway. Sometimes, also, GPU-Z will only show what is currently being used and not the full speed that is available.
 
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Solution
Q

qualsa

Reputable
Mar 17, 2015
2
0
4,510


Thanks for the response.

I checked the manual for the motherboard and it says 'This motherboard has two PCI Express 2.0 x16 slots that support PCI Express x16 2.0 graphics cards complying with the PCI Express specifcations.'

So surely that means it will support two cards at x16 2.0.

The odd thing now is that after re-arranging the cards again, slot 1 is now maxed at x16 2.0 and slot 2 is at x4 1.1. According to CCC anyway that's the max settings for them. Very strange.

Do you think the bios version running on the cards may be the issue? The newer one has an older bios.
 
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Calculagator

Calculagator

Admirable
Nov 18, 2014
2,508
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8,960
According to the Asus site, here are your PCI-E slots:
1 x PCIe 2.0 x16
1 x PCIe 2.0 x16 (x4 mode, 2.5 GT/s)
2 x PCIe 2.0 x1 (2.5 GT/s)

The second slot fits x16 cards but only runs at x4. The x4 1.1 will bump up to 2.0 speeds when it actually needs to.
Again, this is really not going to cause a performance bottleneck.
 
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