Usually branded ram performes and overclockes better than generic. however i have generic ram and it isnt too bad. My ram is made for pc 2700, but i underclocked it to pc 2100 to run in time with my FSB of my Athlon XP 2200+, theres no point having ram running faster than your FSB. So i underclocked it from 2700 to 2100, and lowered my latencies to 2-2-2-4.
Core 2 Duo E6400, DFI Infinity 975X/G, 2x 512mb DDR2 667mhz, Albatron 7900gt, WD 200gb SATA, Samsung DVD-RW, Silverstone ST-50EF 500w PSU.