Ram

Your Board Specs:
2 x 1.8V DDR2 DIMM sockets supporting up to 8 GB of system memory Support for DDR2 800/667 MHz memory modules

Ya you would end up with 6 gb's. But all the test and stress tests me and my buddys have done.(We run 4gb's) We never go over 40%(Less then 2gb's).

So really save some money and just upgrade to two new 2gb sticks. Total of 4gb's.