I was just curious if someone could assist me. I am supposed to upgrade a friend's pc but all I can find is a spec sheet with the specs. The guy said the pc has 1 gig of ram in it and I believe it has 4 slots for upgradability. I am wondering how I would go about finding the motherboard installed. My main concern is that I don't know what memory is installed but I believe it is pc2700 and i'm not sure if it has any type of ECC on it. I was going to get some pc3200 but for some reason on this mobo the memory must be installed in pairs and i'm a bit worried that because of this it could complicate everything if I have memory running at different speeds (will it still clock down?) The model of the pc is sony vaio pcv-rz40c I was going to get some pc3200 crucial memory off of newegg but I wanna make sure its going to work.

There are numerous memory configurators on the web, try one of those. Evaluate your rig's gaming ability

Well, gee, won't the Sony support site "tell" you? I'm not familiar with Sonyeees but I would think........ http://esupport.sony.com/perl/model-home.pl?mdl=PCV-RZ40C®ion_id=1