Crossfire Issue

[beefalo]

I'm having issues with my crossfire 7970s.  I'm only getting about 50 fps in BF3 at 1080p.  GPU 2 usage shows 90 % but GPU 1 usage is only showing 40 - 50%.  Cpu usage is at 70% and GPU temps are < 65, cpu temp is about 50.  I just reinstalled all drivers and it didn't help.  Anyone know what could be wrong?

 

[Cacao]

Have you tested any other games?

[beefalo]

Just tested Crysis 3.  99% usage Gpu 2, 50% Gpu 1.  Same frame rate with crossfire on or off.

[beefalo]

I moved the crossfire bridge and that didn't help.  I'm gonna try switching GPU slots and see what happens.

[ParaNoiD_GameR]

X6 1075 can´t handle two 7970 in crossfire, you´re having a huge bottleneck there friend. Change your cpu and problem solved

[Cacao]

X6 1075 can´t handle two 7970 in crossfire, you´re having a huge bottleneck there friend. Change your cpu and problem solved

That was my first thought, but you can't suggest a bottleneck on this forum because everyone looses their minds :D

[helping]

X6 1075 can´t handle two 7970 in crossfire, you´re having a huge bottleneck there friend. Change your cpu and problem solved

At 4.0? They shouldn't bottleneck it THAT hard

lol @ above

[OneGun]

Do u have a dual bios switch on each card?

[beefalo]

It's not at 4.0 right now.  I know it will bottleneck these cards (even an 8350 can bottleneck them) but there's no way I can't get over 50 fps in BF3 with a 1075t.  I switched slots with the cards and the same problem.  It's just really weird that the second gpu is at 99% usage and the first is at 40% no matter which card is in the first slot.

[ParaNoiD_GameR]

That was my first thought, but you can't suggest a bottleneck on this forum because everyone looses their minds :D

Sorry, I´m new in this forum but I really think that´s your problem. Don´t you have another pc or a friend that has a better cpu for you to put your crossfire in and see if the problem continues ?

And also the latest amd drive have crossfire optimization, are you using it ?

[beefalo]

Do u have a dual bios switch on each card?

Yes.  Switched both over to bios 2.  I'll see if that helps.

[OneGun]

They should both be on 1..

[beefalo]

Sorry, I´m new in this forum but I really think that´s your problem. Don´t you have another pc or a friend that has a better cpu for you to put your crossfire in and see if the problem continues ?

And also the latest amd drive have crossfire optimization, are you using it ?

I know it's a bottleneck but it shouldn't be that bad.  Here's an 1100t in BF3.  I'm getting almost 40 fps less than that and this is with just a single 680.

 

[beefalo]

Just tested Tomb Raider and had working crossfire in that game.  Got 65 fps average in the benchmark with 4 x SSAA and TressFX.  I guess it could be my cpu in the other games even though it doesn't make any sense.  I'm getting a 4770k next week anyway so hopefully it works in there.

[beefalo]

Just tested battlefield 3 again.  In singleplayer I get the same framerate on ultra all the way down to low.  Could my cpu be damaged?  It used to be able to do much better than that.  I could get 60fps at high in eyefinity before.