My secondary Tremulous computer has 64 Megs of RAM, a AMD Athlon 900mhz, 8mb Nvidia Vanta LT, and a 40GB HDD, and a CD-R Drive and a DVD-ROM drive. Worst of all, it runs Windows ME. x_x Anyhoo, it runs Trem fine, usually at 30-50fps, actually. (Thanks to r_picmap 16 or whatever).
As for the real point, I recommend an AMD Athlon FX 60 for a proc, and twin sticks of 1GB ram, and some kind of fast RPM HDD that holds more than 200GB. (Go for Vista, and if not that, Ubuntu. :wink: )