Doubting if you should try Skyrim with those specs.
A six-core sounds impressive, but 360 ports are typically only optimised for 3 cores and Skyrim is in fact threaded for ONLY 2 cores, so your CPU will perform the same as a lowly phenom X2 @ 2,8 ghz here.
That would run Skyrim, with expected framedrops below 25 fps in combat if it weren't for the GPU.
The GPU is the real problem here. You'll want something atleast as fast as gtx260 or a hd4890 (recommended specs), but a 9500gt performs at a fraction of those cards (I'd estimate about 20%). No surprise there since it's the cheaper, budget version of a productline launched almost 4 years ago.
Forget SLI, as that won't help nearly enough.
Replace the videocard with something sensible in the geforce 400 GTX line, or an AMD HD5xxx, for around $100. Anything really fancy and more expensive like a GTX580 or HD6870 will be overkill with that CPU.