Need Help! - R9 280X Crossfire has No Performance Increase

ZoroTheGreat · Jul 31, 2014

I just installed my second MSI R9 280X 3G into my system. I was expecting an increase in in-game FPS but the FPS averages about the same as without Crossfire. I don't believe that it is due to overheating because both cards have not exceeded 80 Degrees.

System Info

Mobo: ASUS SABERTOOTH 990FX R2.0
CPU: FX-9370
GPU: MSI R9 280X 3G (x2)
PSU: CORSAIR RM Series RM850 850W
RAM: G.SKILL Sniper Series 8GB (2 x 4GB)
OS: Windows 8.1

Nothing in my system is OC.

Please Help!

Kohwali · Jul 31, 2014

For SLI you need to configure that in the NVIDIA control panel or something. Very likely, there's something similar for AMD Crossfire.

ZoroTheGreat · Jul 31, 2014

Kohwali :

For AMD it's CCC but I have already checked that Crossfire is enabled.

Kohwali · Jul 31, 2014

Is the second card/PCI-e slot working correctly? Have you tried swapping the cards and seeing if that still works?

Kohwali · Jul 31, 2014

Stupid question, but you're using a Crossfire bridge, right?

ZoroTheGreat · Jul 31, 2014

Kohwali :

I originally had them setup in the first and second slots but that was too close for my comfort so i switched to first and third. I checked FPS before and after the change and it seems to be unchanged.

ZoroTheGreat · Jul 31, 2014

Kohwali :

Yes of course.

Kohwali · Jul 31, 2014

I meant your second GPU. Have you tried taking out the first one and using the second one to make sure its working?

Kohwali · Jul 31, 2014

http://www.tomshardware.co.uk/forum/329225-33-crossfire-card-much

"There was a post previously that had a similar problem....

Apparently the bridge was on the wrong spot on the video cards...something about 1a and 1b or something so only 1 card was being used, and only about 20% of the other card. Double check your Xfire bridge (make sure they are connected on the right spots)."

ZoroTheGreat · Jul 31, 2014

Kohwali :

This may be it because according to MSI Afterburner I was only using 3.5GB of VRAM, while playing, when together both cards have 6GB.

ZoroTheGreat · Jul 31, 2014

Kohwali :

How would i go about testing if the crossfire bridge is not working. It says that the cards are in crossfire in GPU-Z.

Kohwali · Aug 1, 2014

You're typically not going to use over 2GB of VRAM unless you're multi-monitoring. I'd think its working from what I've heard from you - if you can enable CrossFire in CCC. What game were you playing? Maybe its not optimized well for CrossFire, I've read that certain games do worse with SLI for some strange reason. Try looking up some benchmarks in CrossFire with the game you're testing in.

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Need Help! - R9 280X Crossfire has No Performance Increase

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