Quad vs Dual Core in Windows 7

[Simmy]

I've just installed Windows 7 and I'm well impressed so far. I'm running it on an e8400 @ 3.6Ghz but I've just remembered my server has a q9450 sitting in it not doing much anymore (it used to do lots of video encoding). I think I'll try swapping them anyway, but am I likely to see an improvement switching from dual to quad core (assuming I can overclock the quad to a similar speed)?

I've heard Windows 7 makes better use of multicore processors, but I've yet to see any benchmarks to back this up or convince me.