ATX are CHEAP !!! So that's the main reason why. But if you do have a few of those like we do. We use our own produced PSU and breaker boards which allow you to hook up to 4units to 1 PSU + Breakerboard. If you want we can post photos too.
The 12V RAIL is the key. most PSU's have a low 12v RAIL if you want to run it 24/7 go and get a Server PSU those units are build for 24/7 operation.
We sell those also at
http://www.LSE.SolarOlaf
i was talking specificlly about the 6pin connector, everyone how uses an ATX PSU connects their miners to the 6 pin connector, any reason why?
and yes please do show me some pics