Hi, I recently bought a new motherboard and processor and I'm gradually upgrading the rest of my PC parts to follow. A few moments ago I fixed the motherboard and as I was connecting the PSU I noticed the ATX power connector has 20 pins but the motherboard has 24. Should this be a problem? I'm assuming, since my PSU was used on my old PC, quite a while ago, that my old PSU isn't a ATX 12V PSU. If it helps at all, my motherboard is an Asus M2N-E. The specs from the Asus website are here. Any help would be appreciated. Thanks!

Ok, I just noticed something almost immediately after posting this. I meant ATX 12V 2.0. I noticed on Wikipedia it mentions this relating to PCI-E. So, again, is this important?

Yes. Go out and buy a good quality ATX2 compliant powersupply. Look for one that has dual 12V+ rails rated at 20A on each. I believe there are adaptors you can get to go between the current 20pin psu connector and 24pin motherboard socket but personally I would not use one. (many ATX2 powersupplies have a clip-on/off 4 pin end on the main connector so they can be used on older 20 pin motherboards. In this case the powersupply is backwards compatible. Motherboards aren't. I used to have a signature but it disappeared and I just couldn't be bothered writing another so please feel free to ingore this.

Thanks. I think I've managed to get my head around it now! I built a PC for a friend at work yesterday and noticed the clip-on/off pins at the end of the ATX power connector too, acually. Thanks again. I'll have a look at a few now!