Well I have a shop build my PCs and the P5w is supposed to work with SLI. In fact Aive read theres really no difference between the two when used in that configuartion.

From this site
Core 2 Duo Platforms From Asus - A Top To Bottom Comparison

As a single graphics card user, I found that the feature set and price tag of the Asus P5B Deluxe was the most impressive of the bunch. It’s a bit less expensive compared to Intel 975X motherboards, but it does feature Intel’s new ICH8R Southbridge and consumes less power compared to the 975X as well. Performance wise, it will give 95-100% of the performance of the 975X. In my eyes, it’s got the best mix of price / performance / features / overclockability. It’s not the best board in any one of these categories, but it’s above average in all of them, which makes it a very solid platform overall. This is our pick.
http://www.gamepc.com/labs/view_cont...d=c2dmb&page=2

From another site

The board we would choose for our own Conroe system is the ASUS P5W-DH Deluxe. Performance is rock solid and the feature set is superb. It is the best overclocker of the eight boards here and it is based on the 975X chipset, which allows the X6800 to be set to both higher and lower multipliers. You cannot set higher multipliers on the P965 and 965 overclocking is poorer on every board we tested than 975X overclocking. We could recommend the 965 if it were cheaper, but the ASUS P5W-DH costs $269 on-line
Is sli really that important a feature. Will the P5b support dual cards? Which would improv e game performance more , overclocking or dual cards? Im still stuck on a choice.