Ah yes, that's what I was getting at in my previous question. I wasn't sure if my current board would only take DDR1 or if it was just that DDR1 and DDR2 couldn't operate together. That's cool, I'll just look at building my new machine. I wouldn't mind putting some DDR1 in for my mum's sake, but it doesn't seem like it's worth the money in a way. As you can see, I've never really looked into this before, hence running a PC with only 512MB RAM in late 2008!!