well i have a dell optiplex 745 which can hold up to 8GB of ram so now i want to upgrade to 8GB
and im trying to find the best brand there is today! no matter how much it cost. it uses
ddr2 pc2-5300 667mhz 240pin non ecc unbuffered
also another question this computer also supports maximum of 4GB of 800mhz
so my question is which one should i get 8GB of 667Mhz or 4GB of 800Mhz????
Though to be honest, I doubt you'll be able to tell the difference between the two, below is a CAS of 5 and timings of 5-5-5-15. It's $25 cheaper. Besides it's not like your going from DDR2-800 to like DD3-1600 or something where you'd be able to see the difference, but it's your money.
Well then upgrade to 64bit and get another 2x2GB and you have 8 gigs...don't expect to see significant if any changes...If I were you I would just build new rig and salvage whatever you can from your old one.
Look at the module types supported...it specifically writes "2-GB (800MHz not available in 2GB DIMM)" meaning that at the time the board was released 2Gb modules were not on the market =>therefore it does not support them...you grew up in USA so you better start reading/understanding small print