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RX480 Crossfire, zero gpu load on second card.

post #1 of 17
Thread Starter 
Hi,

Today I went and I got two RX480 and installed in my PC. Problem is that the second card is showing zero gpu load. I don't understand why. I ran Heaven and 3DMark fire strike same results for both.

One card is running at x16 PCI-E 3.0 and the second card is running at x4 PCI-E 2.0. I know the second card will have a performance hit, but zero load? that is odd.

I have a Gigabyte GA-Z97-D3H board with an i3-4150.

Here is a screen shot of GPU-z of both cards.




Any ideas?

Thanks

[Edit]
Crossfire only works in fullscreen for some reason -.-





[Edit2 - Second problem]
Alright, well there is only one problem now. This problem makes me think it's a CPU bottleneck, but the CPU usage is not even going above 50%.


In Overwatch I tested few things.


1- I Ran the Game on 4K Epic settings with render resolution of 100% at full screen. with my x16 @ 3.0 PCI-E card. I get @ 35 FPS.

2- I Ran the Game on 4K Epic settings with render resolution of 100% at full screen. with my x4 @ 2.0 PCI-E card. I get @ 30 FPS.

3- I Ran the Game on 4K Epic settings with render resolution of 100% at full screen. with both cards in crossfire. I get @ 23 FPS. (Both cards are at a GPU load of 100%)

4- I Ran the Game on 4K Epic settings with render resolution of 100% at borderless window mode. with both cards in crossfire. I get @ 47 FPS. (My x16 PCIE 3.0 card get's 100% GPU load, but my other card at PCI-E 2.0 x4 sits at 0 GPU load)


My CPU is always hovering at 50% or less.

I don't understand how I can be getting more FPS in case 4. Looking at some benchmarks online I saw people getting 120 FPS with RX480's crossfire at 1440p. I tried running at 1440p and I still get ~47 FPS.

I'm not sure what is happening. Is it the CPU? It shouldn't be. It's not being fully utilized. Oddly enough, in 3D Mark, I get almost the same score as this website. However he is getting around ~7k higher Physics score.





Update 3
Alright, I went and bought a MSI Z87-GD65 board to test and see if my board is the problem. and it turns out yes. my gigabyte board is horrible. With the new MSI board i'm hitting 90FPS at 4k epic settings in Overwatch.

But this build so far cost me $820. I didn't want to buy a 1080 because of the price and because I really wanted to support AMD. But with all the talk of a possible damage to the board with these two 480 I'm thinking of returning them and the new board and maybe just get a 1080.

I don't know....
Edited by Fantasy - 7/1/16 at 1:47pm
    
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post #2 of 17
Does your board support crossfire?

Edit: I just looked it up. You're motherboard doesn't support crossfire. It only has one pcie 3 slot.
Edited by Poisoner - 6/30/16 at 4:30pm
post #3 of 17
Thread Starter 
Quote:
Originally Posted by Poisoner View Post

Does your board support crossfire?

yeap. it says so on the website.
    
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post #4 of 17
Did you enable it in the drivers? And maybe your CPU is holding you back. Seems silly to get two when you will be CPU limited a lot of the times
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post #5 of 17
Try moving the slave card out of the x4 2.0 slot and see if that helps
EDIT: NVM, actually took a better look at the board and saw that there really isnt much of a choice there.
post #6 of 17
Thread Starter 
Quote:
Originally Posted by aDyerSituation View Post

Did you enable it in the drivers? And maybe your CPU is holding you back. Seems silly to get two when you will be CPU limited a lot of the times

True, but the CPU is at 25% while running the benchmark. I don't think it's the CPU. I don't know.

Also, yes crossfire is enabled in the Crimson
    
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post #7 of 17
Quote:
Originally Posted by Fantasy View Post

yeap. it says so on the website.

Look at the pcie slot labels on the picture on the gigabyte website.
post #8 of 17
Thread Starter 
Quote:
Originally Posted by Cyrious View Post

Try moving the slave card out of the x4 2.0 slot and see if that helps

Problem is there are only two PCI-E on this board. One is wired for x16 and the other is wired for x4.
Quote:
Originally Posted by Poisoner View Post

Look at the pcie slot labels on the picture on the gigabyte website.

I did, what's the problem?
Edited by Fantasy - 6/30/16 at 4:36pm
    
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post #9 of 17
Just a guess, maybe the 480 doesn't support 2.0 at all? 2.0 x4 would be equal to what, x2 3.0? Maybe it's a driver limitation. No idea otherwise.
post #10 of 17
Quote:
Originally Posted by Fantasy View Post

Hi,

Today I went and I got two RX480 and installed in my PC. Problem is that the second card is showing zero gpu load. I don't understand why. I ran Heaven and 3DMark fire strike same results for both.

One card is running at x16 PCI-E 3.0 and the second card is running at x4 PCI-E 2.0. I know the second card will have a performance hit, but zero load? that is odd.

I have a Gigabyte GA-Z97-D3H board with an i3-4150.

Here is a screen shot of GPU-z of both cards.




Any ideas?

Thanks

[Edit]
Crossfire only works in fullscreen for some reason -.-


Unless i missed a new memo CF has always used full screen only. Unfortunately its not able to work windowed.
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