Dual Geforce GTS 250 Card Estimated Performance?
 

Look no further than this review of two geforce GTS 250 cards in SLI on Core i7, compared to Geforce GTX 285 and Radeon HD 4850 X2

Although the GeForce GTS 250 SLI tandem has the best average speed in three out of the four resolutions, being especially faster than the GeForce GTX 285 and Radeon HD 4850 X2 at 1280x1024. However, its bottom speed is no higher than 20fps. In other words, the SLI tandem cannot ensure smooth gameplay in every scene, even though is close to doing that.

Take note that the gap between the GeForce GTS 250 SLI and Radeon HD 4850 X2 shrinks from 25% to 8% as the resolution grows up, and the dual-chip card from ATI is even ahead at 2560x1600.

A dual GPU board with GTS 250 is most likely going to feature lower clocked GPUs, so performance will be pretty much on par with GTX 285.

http://www.xbitlabs.com/articles/vid...ts250-sli.html