[Solved] BF3 and crossfire

Hello guys,

I wish you all a happy new year !!!

I have a little problem that bothers me a lot since BF3. Here's my config first :

i5 760 @ 4.2ghz (200x21)
4GB RAM 2x2GIG GKILLZ 1333@1600
MSI G55a something ....
2 x Sapphire 6790 @ 950/1150
Cooler Master GX650

My problem is when Battlefield was released in october, I wasn't able to put the preset setting on HIGH. I explain. It wasn't a FPS issue cause I was always above 60 but on screen it feels heavy and "slow" but not like FPS below 50. When I put Medium preset I got 70 + and it's a lot better and smoother and I don't know why .... I tried to customize my settings but I don't understand why 55 fps on a single card is smoother than 60 fps + on my 2 x 6790.

If I use D3DOverrider and force triple buffering over Direct X it's a lot better but the mouse isn't as smooth as without VSYNC. It's called mouse lag I guess ....

Does someone know how to fix this ?!

Ah nevermind I just read about Crossfire/SLI on TomsHardware and I think it's Micro-Stuttering .... oh well I guess I'll have to wait for better drivers/optimization to limit the micro-stuttering but it's only happening in BF3 not in BFC2 or Metro 2033... shame on BF3

Yes videocards are overclocked 840mhz to 950mhz on stock voltage using latest 11.12 drivers. It was good with 11.11 cap3 I think but since the huge BF3 updates .... it's back. I had this issue since the lunch date but ati/amd fixed it in 11.11 cap3 if my memory is good but then on huge update with karkand and 11.12 cap1 it came back. I'm gonna try 11.12 cap2 if it's still "laggy" i'm gonna try 11.11 cap3 and I'll pick the best one ... no choice.

I can use voltage tweak but it stable like that. Also since 11.12 I got BSOD while playing BF3 randomly ... not sure if it's driver related or not.

Thank for the reply

AMD released 12.1 I believe and helps alleviate BF3 issues, I would try that.

Edit: I jumped to conclusions. It appears mostly to be rage related. But heck, why not try it out anyways?

Thank You guys, I finally got it !!

I followed this as Ernie suggested :

1-uninstall ccc and profiles,shut down
2-remove second card and reboot
3-install latest drivers(12.1) and profiles(11.12 cap2),shut down
4-install second card and reboot.

And also did this command in BF3 console : renderdevice.forcerenderaheadlimit 1

Now everything is smooth like butter

I'm gonna upgarde my ram as also because it became a bit saturated while playing around 95 96% usage in BF3. I'm gonna get a 8 gig kit from Gskillz !!

Thanks a lot guys for your help !