Sorry, I should have given you the set up when I asked this question. Mobo: A7N8X-X REV 2.xx; CPU: Athlon XP2500+. I have 512Mb of indeterminable RAM, an ebay buy. I have a couple of probs with the setup which, from other threads, seems to be down to the RAM (eliminated every other likelihood) so I wanted to buy some new RAM. What I will do, I think, is buy 2 x 256 of Kingston. I shall report back! Once again, many thanks indeed.