Only sees half of it

[Hermskii]

I have a buddy who has an old Pentium III 8mhz system he is using as a backup system while his main box is dead. He said that he has had 512mb of PC100 ram in it before. He said recently when he turned it on, the bios and the OS only 1/2 of the total of ram he has in it. I gave him 2 sticks of Crucial 512mb PC133 CAS2 totally 1gb of ram to use in it and it is doing the same thing to my ram as it did his being that it only sees 1/2 of the total.

I told him maybe the old mobo has limits to how much ram it can see and / or maybe he needs to flash the bios to the latest one. He has WIN XP PRO running on it and the bios can see 130gb of his 160gb drive so I don't think the bios is so out of date. Any other ideas?

 

[Billb2]

It's old "single sided" vs "two sided" memory thing.
The terminology has changed since that mobo was made though.

 

[Blazer7]

No it doesn't have to do with single sided or double sided DIMMs. The problem here is that newer PC100/PC133 mems are based on high density 64/128MBit chips. What you need is older, lower density modules, probably 32MBit, and these are hard to find.