You'd have to read your mother board manual to see if it can handle 4 gigs. On some MB you can use 4 gigs but it may not all show up. Also you have to set the timing right, most MB need to have a 2t timing when using 4 gigs ( SLOWER but the more memory makes up for it ) as with 2 gigs you can use 1t with GOOD memory. Plus your OS will dictate how much you can use.. XP home can handle 4 gig but some mother boards may not.
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