8800gt sli performance increase?

not enough... don't sli at such a low res...

its only for 1680 by 1080 plus res's

if you want an upgrade get a 4870

ya i run it at 1680x1050 all very high no aa at around 19 fps average. With sli how much will it increase?

I'd expect it to maybe go up to 30 FPS with all settings the same.

If you are talking Vista DX10 very high, then it will make a big difference in many levels of the game. Take a look how the 9800GX2 demolishes the 512MB 8800GTS and 8800GT. (35 fps vs 22 fps vs 19 fps) http://www.digit-life.com/articles2/digest3d/0408/itogi...

Add fsaa:
http://www.digit-life.com/articles2/digest3d/0408/itogi...

i have 8800gt's in sli and im running crysis all settings maxed and im getting about 30-35 fps.
but im running at 1600x1200

wait all maxed out even 16aa?!
i get the same fps as u and i have 2 gtx260 in sli all very high 16aa.