Hi All, OK I have a EVGA680i SLi mobo with 2Gb of RAM and 3 GTS450s (1Gb each) running under XP Pro 32bit. First up I know this is a bad idea, however I didn't think about it at the time I brought the cards. Anyway it works fine, I don't know why but it does but the cards get ~11,000PPD each on the right WUs and ~8000PPD each on the others. So what the hell I thought lets do it again, this machine is the same, but even on the good WUs the cards only get ~9000PPD, and the machine is unusable, it is so VERY slow at doing anything. I've had a look in System Information and it says I have 1.54Gb available. I have a slight thought that the hard drive is on the way out as it sometimes isn't recognised at boot, could it be this? Otherwise any ideas? (Please don't say get Windows 7 64bit). Can I manually map the memory as I don't need all the video RAM?