Wow, an mATX Amiga motherboard with built-in graphics. I'd bet they're using the VIA graphics solutions found in the VIA"C" series ITX motherboards. While not exactly GeForce 4Ti class, the folks at mini-itx.com seem to like them.
As to the original poster's question, for a few dollars an AT to ATX power converter cable; given the low power requirements of the 950fx CPU, a 300w AT power supply might do well enough. Lord knows they're cheap enough if you can find them...
