I'm looking to upgrade soon and would like to find a site with all the specs for each mobo listed side by side.

Basically, I need these specs:
ATX
P4 socket 478 533FSB
at least 3 DDR slots(the faster, the better)
built-in sound
built-in LAN (optional)
built-in USB 2.0
at least 2 PCI slots
4x AGP slot
ATA 133
all the other normal stuff(IDE/floppy controller, etc)


Question: Are motherboard power supply connectors different? I wanted to just replace the mobo/cpu in a case I have already...it is an AMD athlon Tbird 750 (socket A).

thanks

Try here:
http://www17.tomshardware.com/mainboard/02q3/020722/index.html

Or here, http://www.motherboards.org/

Or here: http://www.anandtech.com/mb/showdoc.html?i=1667

As long as your old mobo is ATX, a new ATX board will fit straight in, and the power connectors will fit. :)