Upgrading DDR333 to DDR400.?

I have to upgrade somebody's PC from 512mb to 1gb of RAM. In the computer are two 256mb DDR333 sticks. Will it be ok to use one 1gb DDR400 stick?
if the motherboard does not support DDR400, will it lower down to DDR333?
Reason I just don't order DDR333: My supplier doesn't have cheap DDR333, 1gb of DDR400 ram is cheaper than 1gb of DDR333 RAM at the moment.

Thanks.

Answers:
To check what the motherboard supports to go www.crucial.com , that site will tell you what speeds, and if you have to install in pairs.

The answers post by the user, for information only, RunQA.com does not guarantee the right.


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