2x9800GT or Ati HD4870?

[GAIANA]

I want to play change my pc configuration to play games like Crysis or Stalker Clear Sky, and I confuse the choice between two configuration, or rather two graphics cards: an SLI of 2x9800GT or Ati HD4870.

According to you, processor, ram, and Graphic card, which of these two choices you like the best?

[NAEVA]

MY opinion in quality / price / trouble is to be taken in 4870

[GAIANA]

So in terms of the 4870 performance would be better than SLI 9800 GT?

Not that this surprises me more than that but I really thought that would 2x9800 when the difference (I did not find a comparative test or on the net on both systems)

[NAEVA]

The difference may not be huge an SLI will be more expensive to develop,
It will consume more there are often problems start.

[GAIANA]

So the two config accurate are:

Intel Core 2 Duo E8500 3.16GHz, DDR2 memory G. Skill Extreme Series in 4GB PK PC6400, Sapphire ATI Radeon HD4870, Motherboard ASUS P5Q Pro + Food eXtreme Power 600Watts

OR

Intel Penryn Core 2 Quad Q9400 2.66GHz, motherboard MSI P7N Platinum SLI, NVIDIA GeForce 9800GT 512MB GDDR3 Dual DVI mounted in SLI, Memory Crucial Tracer BallistiX 4096MB DDR2 PC2-6400 + Case 4 2X2Go Hiper Power 580 Watts TypeM

[FAIRFAX]

I take the first with the pro hd4870 + p5q what I'm fickle so I took the deluxe, but by changing the rest