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BF 3 on HD 6950 1Gb vRam Crossfire or 2Gb vRam

post #1 of 5
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Hello people!

Well I play BF3 a lot so I decides a bit ago to add another Hd 6950 1Gb version to my rig to crossfire it.

The problem is that I can't actualy play on High settings ( no AA ) on a 1080p monitor without having annoying frame drops... the frames drop to 40 a lot! like A lot.. its acctualy annoying and unplayable. I'm currently playing on Medium settings cuz its the only setting where I can run it smooth enough.

firstly I wanna know if 2 Hd 6950 should be able to run Bf3 on high settings... Does anyong with cards like mine can play smooth on high or ultra?

2nd... I wanna know if the 1Gb vRam has anything to do with this frames drops?

its wierd cuz I can play Crysis 2 maxed out with all the updates and stuff smoother then Bf3 at high or ultra....

Thanks a lot!
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post #2 of 5
I think the 1GB of Vram is most of the issue there. Adding another 1GB card in crossfire won't make it a 2GB setup. The memory on each card mirrors each other, limiting you to 1GB usable.

I just checked on newegg and a 6950 1GB is $250 while a Sapphire 7950 3GB with upgraded heatsink is $299 plus a $20 rebate and free shipping. That will have plenty of horsepower at 1080P for Ultra on BF3, especially when overclocked.

Also, I was able to play BF3 on High with a 6870 1GB at arround 40FPS for reference.
post #3 of 5
I currently have 2 MSI 6950 1GB cards in crossfire x with a 3-monitor Eyefinity setup. I am stuck on medium settings in BF3 but I think that has to do with my 3 monitors (2 24" Dell Ultrasharp and 1 24" Asus LED). I'm getting about 78-90fps but am also getting alot of heat with my configuration. I am populating the first two PCIe slots in the config (16x slots, 3rd is 8x i believe). My cards lock up some times. I suspect overheating may be the issue.

Does anyone have experience with eyefinity & crossfire? Should I be able to run on high settings in BF3 and get decent frame rates with my setup?

Mobo: EVGA Z68 SLI
VGA: 2 x MSI HD6950 1GB (Catalyst 12.8 drivers)
post #4 of 5
I had the same issues with my HD 6870s. I've tried everything and there is just nothing you can do about it...Battlefield 3 is an absolute vRam hog.

At high settings, it's supposed to use well over 1GB of vRAM. At medium, it's borderline 1GB of vRam usage.

It's at you best interest to do the same thing I did and upgrade to an HD 7950. Sell your HD 6950s while they still hold their value around $180.
Edited by Raven.7 - 9/25/12 at 9:11am
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post #5 of 5
Quote:
Originally Posted by breal1 View Post

I currently have 2 MSI 6950 1GB cards in crossfire x with a 3-monitor Eyefinity setup. I am stuck on medium settings in BF3 but I think that has to do with my 3 monitors (2 24" Dell Ultrasharp and 1 24" Asus LED). I'm getting about 78-90fps but am also getting alot of heat with my configuration. I am populating the first two PCIe slots in the config (16x slots, 3rd is 8x i believe). My cards lock up some times. I suspect overheating may be the issue.
Does anyone have experience with eyefinity & crossfire? Should I be able to run on high settings in BF3 and get decent frame rates with my setup?
Mobo: EVGA Z68 SLI
VGA: 2 x MSI HD6950 1GB (Catalyst 12.8 drivers)

Sell your HD 6950s while they still can get you around USD 150 each. Get a HD 7950 OC and overclock to 1.1 - 1.15 Ghz. HD 7950 (1.15 Ghz) will be able to run BF3 at Ultra without MSAA at 5760 x 1080.

here is a user running Sapphire HD 7950 950 Mhz overclocked to 1165 Mhz

http://www.overclock.net/t/1253670/any-benchmarks-for-single-7970-680s-running-at-5760x1080#post_17572917
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