Is it better to use 2 256MB ddr 266 or one 512
Always get as _FEW_ sticks as possible!
If you must use more than one, make them similar, if convenient and
possible.
Do avoid, to considerable lengths, using more than two sticks.
Of coarse, if you want to run dual channel you need two, and they must
be similar.
Unless you're doing a 800MHz fsb P4 on a dual channel mobo, the
correct answer to your question should be one 512.
ancra