Derp:
Q9450 (2.66 ghz quad core)
4gb
HD4950
Windows 7 64bit
I also own a laptop that can very barely run dx9 mode. 2gb of memory, HD2400XT mobility and some crap AMD dual core processor. It's not like I could be arsed to play major amounts of time with that though, but to test if something kills it, yeah, sure.
Edit: Yeah, I play polearms right now, but I tend to swap specs.