I had been intending to go x850, but am not so sure now... considering that I am leaning to a DFI NF4 mobo as there's no discernable performance differences in the SLI or ULTRA versions. The fact that effectively an ULTRA board can (currently) be converted to SLI started me digging and wondering just how good SLI was over dream of an x850... As I was searching I found the Nvida 3D1 card. (multi GPU) which seems to imply that it gives SLI capabilities on a single gfx board... So knowing that I had to start somewhere I started pricing things out: This is the card I was leaning towards: Connect3D ATI Radeon X850 XT PE £340 However, a single GeForce 6800 Ultra are £375. The rub is that in about 6 months I could get another and SLI it..... The 3d1 has 2x6600GT on a single board: £365 (but comes with a K8NXP-SLI nForce4 SLi mobo.) Trying to replicate the 3D1 in SLI format 2xPCX6600GT-TDH Extreme Edition = £280 Used the following 2 refs: http://www.overclockers.co.uk/acatalog/X850_Series.html http://www.overclockers.co.uk/acata...800_Series.html The rest of the system... AMD4000 Clawhammer NF4 Lan Party (so basic overclocking is a given) Corsair 1Gb XMS3200XL Plat So my questions are: 1. Whats the point of the 3D1 having already introduced SLI - reviews seem to imply mobo's have to be SLI compatible anyway! 2. Assuming the answer above is "no point getting it really." Is there an advantage in saying goodby to the x850 and going for the dual 6600GT SLI technology, 3. If the SLI option doesn't match up would a 6800 Ultra match up to x850 performance. I have to admit that in 6 months the purchase of another 6800 and SLI them is an option; (though not strictly necessarily!) Recommendations; thoughts espcially with regard to: Overclocking Cooling Noise Man.. I got so many thoughts!