Ok i've got a gigabyte ga-7zm socket a board. it says in the manual that it supports 512mb dimms. So i bought 2 512mb pc100 registered ecc kingstons in the forsale/trade forum. I try them on my board and i just get beeping. Is it because they are registered? do they even make unbuffered 512mb dimms? I just wanted to try them out on this board and see the big 1 GB show up, even though they are gonna be used in a server. But still wondering why it didnt work.