Single GTX 285 or single HD 4890. (2GB variants for hig-res, if they ever show up)
This comes from someone who's gone through 4 generations of SLI (6800, 7800, 7900, 8800)
There are situations where one can actually appreciate SLI, but those are exceptions rather than norms, IMO.
Jared: You mentioned in the other thread that SLI is different in X58 - Can you give a little more detail on that? X58 and NF200 are very similar in nature (PCIe switch) and X58 is pretty buggy in its current state.
New stepping (.pdf) X58 is just released to board manufacturers along with new BIOS codes. By no means I'm saying NF200 is any better, but when it comes strictly to PCIe performance, the two shouldn't be too different. (Though I could imagine NF200 consuming more CPU cycles than X58) In general, I think SLI performance is largely dependent on drivers more than anything else.
It is possible that IMC-quickpath subsystem shows its strength under multi-GPU scenario, but according to the benchmarks I've seen so far gaming isn't where Nehalem stretches its legs as long as it does in other areas. And you also said CrossFire is no different on X58 than on X48/P45?
So it got me curious if SLI experience is really better on X58, and if so why/how. Actual user experiences often differ from reviews, and that's why I'm asking.