After installing the 2nd Geforce GTX 570 and enabling sli I was disappointed with the performance in BF3. Video settings are all maxed out and with v-synch off I will get 75-130 fps depending on the map. It looks great, but it at moments in the multiplayer game when there is alot of activity (vehicles, explosions and sounds) the gameplay will become very choppy. The in game fps indicator will turn from green to yellow and then it quickly goes back to all is normal. Frequently it will freeze and crash to desktop. Before going sli it ran pretty darn good, but i wanted to max all out. So far not getting the return I had hoped on the investment.
Any help would be appreciated. Maybe another component of my rig is hindering performance.
Before going sli it ran pretty darn good, but i wanted to max all out.
First of all - ditto on the comment above. I was running a single GTX 470 with all graphic settings on High, eveything else (AA, HBAO) turned off except AF, which was set to 16x. V-synch off, FOV set at 90. The game ran super smooth.
But I got greedy....
I just HAD to see this game in all of its glory with all of the bells and whistles on my 46" LED. So I ordered a duplicate 470 off eBay, bought a new PSU to power SLI (Antec 650W replaced with an Antec 850W HC) and I am having the same experience as you - game looks wunderbar, but gets choppy during high-action sequences.
Through much testing I have narrowed it down to the MSAA 4x causing most, if not all, performance issues when running on "Ultra" settings. When I change the AA to off the game suddenly plays like I expect it to - smooth as butter with ultra textures/graphics at 100+ fps. The motion blur is annoying, but does not seem to affect my performance, so I left it on when testing (but I turn it off usually).
Personally, I do not think the problem is SLI, I think it is a problem with the way BF3 implements AA. I have NEVER been a fan of Anti-aliasing going back 8-9 years when ATI and Nvidia made it sound like it was the greatest thing since Jesus (marketing people, pfft). It always makes games look blurry and kills performance. Turning it off not only brings me McDreamy performance in SLI, but I think the game looks better. Win-Win for me :-)
Thanks for all the help. My "Best Answer" goes to donkey2008. I feel better now knowing that this isnt an issue with my build. The adjustment to AA like suggested seems that have corrected the stuttering issue. I really dont notice any negatives with it off. Thanks again for your time.
Always looking for friends on BF3, let me know if interested.