My setup varies.
Mine's old school though.
Socket 939 benching/backup system:
Athlon 64 X2 Manchester-(stock 2.2GHz) 2.6GHz 24/7 overclock (when I keep it overclocked) (1.35V stock) @1.4V (2.8GHz max OC for benching (1.6V+))
DFI LanParty nF4 SLI-DR Expert
Ram varies, Corsair PC3200 (Winbond CH-5) Corsair PC3200 (Winbond UTT), Corsair XL (TCCD), Corsair XL Pro (TCCD), Patriot XBLK (TCCD), Corsair PC3500 (Winbond BH-5), Mushkin (Winbond BH-5 and UTT), Crucial Ballistix (Micron -5BD), etc.
Hitachi 80GB drive
PSU: Corsair TX750, HX520, or VX550
GPU: nVidia 9800GT, GTS250, GTX260
Also Athlon 64 3200 Venice (2GHz stock, 2.8GHz comfortable daily OC, 3.1GHz max OC), 3700 San Diego (2.2GHz stock, never overclocked), 3800 Venice (2.4GHz stock, 2.7GHz comfortable daily OC, 3GHz max), 4000 San Diego (2.4GHz stock, 2.7GHz comfortable daily OC, 3GHz max) or ClawHammer (2.4GHz stock, 2.6GHz comfortable daily OC, 2.8GHz max), or Athlon 64 X2 4200+ Toledo (2.2GHz stock, 2.6GHz comfortable daily OC @1.4V, not yet tested for max frequency).