It's a fifty buck supply from Gekko Science, you should look into it.
Guys, wake up to server PSU's! they go for a pittance and are more robust than an equivalently rated (wattage wise) boxed PSU. Fifty bucks may sound like a steal until you find out an equivalent 2nd hand server PSU is 15 bucks give or take.
A server PSU's that would adequately power an overclocked S3 (and then some), can take the shape of:
http://store.vibrant.com/Dell-HY104.html?utm_source=amazon&utm_medium=ads&utm_campaign=Dell-HY104
also at fleabay
http://www.ebay.co.uk/itm/Dell-PowerEdge-1950-Power-Supply-HY104-0HY104-Z670P-00-7001080-Y100-PSU-/360931800592?pt=UK_Computing_PowerSupplies_EH&hash=item5409363610
Both of those do not have enough juice to run an s3. The s3 needs just over 30A on the 12v to do 370w at the wall, and I'd rather the supply do 40A so I have room to move.
What server PSU's do you use to power one s3? And what does it drain at the wall?