RAM Questions...

[WhiteSnake]

If you got a Windows XP or Vista 32bit version than i advice you to use 2x 1024mb DDR2-800 in Dual Channel, the closer they are matched, the better so best would be to buy a set.
2Gb Dual Channel gives you much more performance than 3Gb Single Channel.
You enable dual channel by sticking the ram modules in slot 1 & 3 or 2 & 4.

If you got a Windows XP Media Center Editionb 2005 32bit (4Gb max), XP 64bit or Vista 64bit you can stick 4x 1024mb DDR2-800 in your Mobo, than 1 & 3 and 2 & 4 will go into Dual Channel mode.

There are also 2Gb DDR2-800 modules that are not to expensive, so for a 64bit OS you could stick 4x 2048 in your Mobo.

Paired modules in Dual Channel are faster than double the amount in Single Channel.