Originally posted by: cpush
is that extra 4 pin connector one that supplies more power to the pci-ex slots? or what does it do
Don't get the connectors confused. You are right to be concerned about Soltek using only a 20pin Main ATX connector on this board, when your X800XL does not have a power connector of it's own. The additional 4 pins on the 24 pin style ATX main power connector are to supply more juice to the PCI-E slot.
The additional ATX 12V 4 pin connector (the other one, the one that has been with us since AGP and located seperately from the MAIN connector) is to supply additional CPU power only.
The Power Color X800XL is one of the few Radeons using this GPU that has an additional 6 pin PCI-E power connector on it. You might want to buy that one and RMA the one you just bought, since you will then be assured the card will be getting enough power. Fortunately the Power Color card is one of the less expensive ones, and interestingly enough is also one of the more feature rich (VIVO).
Edited to say that you could also go with the ASUS A8V-E Deluxe, but it is expensive and I think still has some serious bugs to be worked out on it. It comes with a pretty useless WiFi-G adapter built right into it, which jacks the price up about $30 needlessly, and from what I understand still has serious issues with any nVidia GeForce6600GT and I think one review site had trouble with USB 2.0 mode on the ports. Yikes, perhaps I should NOT told you about this board, but it is the only K8T890 board with a 24 pin Main ATX power connector, I believe. The Albatron board will also have a 24 pin connector on it, but I have yet to see it for sale.