2 Sticks of 512 compatible with another 1 gig stick?

So yeah, I have 1 gig of memory, (2x 512) and I'm thinking of upgrading, I'm just checking to see if it's problematic to add a 1 gig stick? So I'd have 2 sticks of 512 and one stick of 1 gig. I don't see why this would be a problem, but I just want to make sure. Thanks.

I could be wrong but I dont' think so. I think he will see less performance than if he just had two sticks that were 1 gb apiece. DDR needs to have a perfect pair to be really effective plus he won't be able to do dual channel either.

You really need to check the documentation for your motherboard. I know from experience that there are more than a few MB's out there that do not support 3 dimms in any configuration. Besides, 2x512 kits are cheap now.

Note: I'm making the assumption that this is a DDR board with 4 slots. Maybe when you ask a tech help question in the future you can actually give a shred of information to work with.

I didn't mean dual channel wouldn't work, I meant that some boards simply will not boot with 3 dimms. 1, 2, 4 are your only choices.

And i'm not sure about 4 sticks dropping the speed (It doesn't on my K8NXP-SLI), but as far as I know there are no boards that will keep 1T with 4 sticks. It will default to 2T. (It's actually due to AMD's mem controller)

Oh, sorry. Didn't realize that the motherboard might matter as to whether or not this could work.

I have an Albatron K8X800, slot 754, three DDR 400 compatable memory slots. If I had four I'd just go for another 2x 512, unfortunately that's not an option.

It says it can support up to 3 gigs of DDR 400 Ram.

Thanks for the replies, by the way.