Just a comment about the motherboard: it appears to have only 3 dimm slots. If it has the normal 865 chipset (seems to be the case), the memory works best in pairs (2 x 256, 2 x 512); thanks to "dual channel" mode, you'll get a speed boost of some 10% or more in normal conditions.
Now, with this motherboard, suppose you use two dimms, and then want to expand your memory at a later date... you'll be forced to either replace the two modules you have (in order to retain dual-channel mode), or you have to add a third module, which will make the board run in single-channel mode, negating the original speed boost.
So... perhaps another motherboard with four dimm sockets might be a better option. Or not, depending on the price.
