Originally Posted by friend'scatdied
Sync the clocks on the GPUs. With CFX it is possible to run different clocks on each GPU, but always preferable to run them at the same speeds.
My 6990 got higher frames than my 590, but my 590 played better and felt smoother. That said, the 590 still gets microstutter and still feels terrible below 70 FPS.
Sell both cards and get a 7950 or 7970. Multi-GPU sucks, and is pretty much only for benchmarkers, show-offs and/or noobs.
Not quite. That is a rather broad statement there. Just because someone like myself runs a Multi-GPU setup, they are not show-offs or noobs. I could careless what my benchmarks are. Do I compare them sometimes? Sure. Do I 'show off'? No. Perhaps you consider Multi-GPU users 'show-offs' because they have a faster system and can run higher settings in their games, etc. Micro-stutter is NOT a big factor with multi-gpu setups. How do I know this? Because I've had nearly every multi-gpu setup in recent memory. Both Nvidia and AMD.
With my 3 6970s, I never had any micro-stutter. One reason was because my fps were always above 60fps no matter what, and I use a little tech sense and use a frame limiting app to create an fps ceiling, which greatly reduces any 'stutter', regardless of severity or notice-ability. Even when using 2 6970s or 2 560 Ti's, I never noticed any micro-stutter. Sure it wasn't as smooth as it could be, but that's why you use a frame limiter and lower your settings a bit to keep your minimums as close to 60fps as possible. Sometimes a little common sense goes a long way...
With the addition of my 7970, and soon to be 2nd 7970, I have noticed that it is a little bit smoother, but as far as stutter goes, I see no difference. When you're using multiple GPUs, you have to expect a little variation in latency and frame timings. It's damn near impossible to sync up 3+ GPUs perfectly, and there will always be minor issues associated with such setups, but as of now, drivers and engineering have caught up to the point that microstutter, at least in my perceived opinion, isn't a game hindering experience.
In the end, I would much rather have a 120fps avg, and a 60fps minimum in BF3, than a 60fps avg, and a 30fps minimum...