O.K.Here goes, I have an asus P5BW-LA motherboard, and I am wanting to upgrade my RAM. I have tried doing a little research on the subject of latencies and timing as well as a size that is reasonable for my 2.16 Core Duo CPU. My motherboard does not allow me to change almost ANYTHING in bios(Phoenix) as HP has made it that way. I do know that HP says that pc2-4200,pc-5300, pc2-6400 are compatable. I do want lower lantencies of CL4 if possible. I am unsure of what voltages are o.k. to use(I do know 1.8 will work), and what RAM would be an efficient choice for my computer for mostly gaming and audio video, without overdoing it. From what I have read my bios will pretty much limit my upgrades by lowering voltages and speeds, but thought of buying higher spec's for possible future use. Possibilities are that I may decide to upgrade to a motherboard with a bios that I can change and would add a faster CPU of 3gh or more that I may overclock. For all of you Rabid Posters---SEE BELOW---, please refrain from cluttering up my post as researcher's want REAL answers they do not have to dig through the garbage or Ads for. Or better yet take a class on writing with all of your super tech intellect. "If we as a people do not inform others of real truth/knowledge. We are truely the scurge/darkness of the earth." -Natale C.G. Anyway I used G.Skill (4x1GB) pc2 - 4200 CL 4 1.8V and it worked like a charm. But as I said before, I cannot change anything (OC)due to my Bios. As for the 4gb comment, THAT part I read already in countless searches for a new OS.