I've got 256MB of RAM on my computer and I've decided that it's not enough! The thing is, I don't know what memory it has installed now so does it matter if the two modules are not matched? I have an MSI K7N2 Delta-L MoBo if that helps! I'm thinking of installing either OCZ PC3200 RAM or Corsair PC3700 RAM (from overclockers.co.uk). Thanks for your help!