i'm running 1gb of corsair vs at 4-4-4-8 and i get ram errors after 5 minutes of memtest at even a hair over 200 (like, 202...) or even a hair under 190 (188). i don't know an awful lot about ram, but i would think that i'd be ok with 2.8-2.9 volts at 205mhz, but noooo.
i'd recommend going with something OTHER then value ram if you plan on overclocking at all. but if you're planning on making a nice, smooth, stable stock running machine, corsair value ram is reliable and CHEAP and will get the job done nicely