Massive crossfire problems

[Phill4321]

Hi, my friend has 2 x 6950's in crossfire. He has recently bought his second 6950 and has not noticed much of an improvement with two in crossfire, over his original one card setup. His monitor resolution is 1440 x 900, could his monitor not be high enough in terms of resolution to justify the two cards? Or is the crossfire not set up properly? He has only noticed about a 15% improvement with the second card.

His specs are:-

i5 - 750 @ 3.5ghz
msi p55 gd80 motherboard
8gb of ddr 3 ram
750 watt psu


Thanks for your help

 

[MDPlatts]

has he a) enabled crossfire (does GPU-Z (show enabled) or CCC (show linked adaptors) and b) installed the CAP's - e.g. the 12.1 v2's are here, for crossfire you need them - http://sites.amd.com/us/game/downloads/Pages/crossfirex-app-profiles.aspx - though for most games that resolution won't justify CF - it tends to be 1080p/1200p or higher which need it - though it depends on the game/settings too.

 

[MeMeMeMe]

I wouldn't be surprised to see very little improvement with a second 6950 at that resolution - one should be all he needs.

To be sure, he can install MSI afterburner, and enable the onscreen display. He can then check if each card is being used fully in game.

 

[Phill4321]

Thanks guys, I thought two cards would be overkill, but he is on about getting a new monitor very soon. So by then he could get the most from his crossfire setup. He is going to bring his rig to my house and test it on my monitor. My res is 2560 x 1440. We will test with one card and then with the both in crossfire to see if the fps is roughly double with two. If so then we know that the crossfire is working.

 

[Surveyor]

We will test with one card and then with the both in crossfire to see if the fps is roughly double with two. If so then we know that the crossfire is working.

It's not very often you see 100% scaling so don't expect double.

Radeon Pro will show GPU usage in game so you can check if both GPU's are being used and how much.

Settings > CrossFireX > Tick the box to Enable the CrossFireX bar.

Also if you right click on the CCC icon in the taskbar, and highlight the first GPU listed, you can select the option to "Show CrossFireX Status Icon".

When any game is using CrossFire the icon will appear in the top right hand corner of the screen.

And remember that CrossFire only works in full screen mode.

 

[Final8y]

It's not very often you see 100% scaling so don't expect double.

Radeon Pro will show GPU usage in game so you can check if both GPU's are being used and how much.

Settings > CrossFireX > Tick the box to Enable the CrossFireX bar.

Also if you right click on the CCC icon in the taskbar, and highlight the first GPU listed, you can select the option to "Show CrossFireX Status Icon".

When any game is using CrossFire the icon will appear in the top right hand corner of the screen.

And remember that CrossFire only works in full screen mode.

I would advise him to use MSI afterburner to show GPU usage as its less complicated and takes away the chance of messing up CF performance and other possibilities from messing with other stuff.