Yes, I have a friend with an old dell dimension desktop running on an Intel i845E board, not sure about the exact model number but it is using on one slot a 256meg ddr PC2300 ram.... i want to get 2 gigs for him, which is about 75 bucks for ddr400. Will the ddr 400 work on his board... I know thats clocked higher than what he has now, but it shouljd just underclock itself correct? Sorry for the bad typing btw. Jamed middle finger.