I have an old PC from 2007 I'me running the game on, and everything seems fine on medium settings (4x AA, 8x Aniso).
AMD Athlon 64 X2 6000+ @ 3.0GHz (Socket AM2+)
8GB RAM (DDR2 800MHz ECC) (but the memory controller on the CPU can only see 2GB per stick, for a total of 4GB which sucks, I only have 2 RAM slots)
Some shitty Gigabyte motherboard, Mini-ATX with PCIe 16x 2.0, and only 2 SATA II plugs, no USB 3.0 for me, sadly.
Nvidia GTS 450 1GB (GF106, internal name) developer card my stepdad gave me from Nvidia labs, where he works and tests mid-range cards.
Some shitty 550 watt PSU, ready to die from overload any day now.
Two 7200 RPM SATA harddrives by Seagate, purchased nearly 10 years ago, and still working flawless, although a bit slow and featureless by today's standards. (No NCQ, No perpendicular recording, etc...)