My PC specs can be seen in my profile. Considering my resolution (2560 x 1600) and the fact that I run very high AA and AF (32xS and 16x respectively), would having an SLI (GTX 680 4GB) improve the frames? I do see my frames drop to 15-20s if I fly through clouds in bad weather (I use REX and 4k textures).

With large resolutions like yours, and high AA, you should definitely see some benefit from SLI. With a 680 card though, you might simply be CPU bottlenecked, and spending hundreds of dollars to get another card might not give you the kind of improvement you think it will, but you never know. You really need 32x AA working on 4096 clouds?

Take a look at the thread pinned at the top of this forum: http://forum.avsim.net/topic/373069-sli-test-results/

 

FSX appears to benefit in some situations but not others. It's all in that linked thread.

Yes it is from a cockpit like NGX, but the cloud textures that cause the low FPS (REX 4k clouds) could be improved no? I say all of this because I use 32xS AA and 16x AA with 8x sparse grid sampling. Same for the airports and wet runway surfaces, all of these things tax the FPS big time when used with high AA and AF settings at high resolutions (2560 x 1600).

Yes it is from a cockpit like NGX, but the cloud textures that cause the low FPS (REX 4k clouds) could be improved no? I say all of this because I use 32xS AA and 16x AA with 8x sparse grid sampling. Same for the airports and wet runway surfaces, all of these things tax the FPS big time when used with high AA and AF settings at high resolutions (2560 x 1600).

 

Good God, man! 32xS and 8x sparse grid, and 4k clouds. You really need you image quality cranked up that high? I'll bet you could easily gain 10 fps just by backing those off just a little bit, and it would still probably look fabulous. What requires you to use 8x sparse grid, isn't that like one of the worst performance drainers ever unleashed upon FSX?

SLI won't help much. My suggestion: put down AA, who sees the difference anyway between 8xS and 32xS? Perhaps in the cockpit, but looking at clouds the effect of AA almost can't be seen imo.

Yes it is from a cockpit like NGX, but the cloud textures that cause the low FPS (REX 4k clouds) could be improved no? I say all of this because I use 32xS AA and 16x AA with 8x sparse grid sampling. Same for the airports and wet runway surfaces, all of these things tax the FPS big time when used with high AA and AF settings at high resolutions (2560 x 1600).

 

Do you run DX9 or DX10?

Can you please post a screenshot of MSI Afterburner or similar with your GPU usage in both your cards, while running the NGX from the VC and those AA/AF settings?