with regards to the 24-pin PSU, i'm not sure how stable it will be if you use a 20->24 adaptor. I think that the main reason for the ATX 2.0 standard was A) added stability for server platforms and B) added stability for the increased demands brought by PCIe. With Asus's SLI board, they said you could use a 20-pin PSU for anything up to an SLI 6600GT setup, as long as you used the 4pin EZ-Plug located next to the PCIe slots, as this would help with stabiltiy. Chaintech seems to have the 24-pin connector located next to the PCIe slots for the exact same reason, although i'm not sure if the solution is sufficient for higher end cards. I'd say if you are going with a 6600GT, and already have a PSU, a 20-pin should be fine. Oh, and as for the adaptor, it's not necessary - just leave the top 4 pins open, since that's all the adaptor does anyway. However, if you have yet to buy a PSU, or are buying a $400-500 graphics card, or are planning a graphics/dual core CPU upgrade, just shell out for a nice new 24-pin PSU to ensure stability now and in the future. I recommend the Vantec Stealth VAN-520A. It rocks - 520W, 3 fans for good, quiet cooling, more connectors than you'll ever need, SATA adaptors, very stable, and 24-pins. Oh, it also has a 24->20 adaptor so you can use it in older board. Anyways, if you want a new PSU to keep with you, you should be looking at 24-pin ones, cause with PCIe taking over, expect them to become pretty much standard.