Edit 2: and yep, that entire payment comes from coinbase transactions paid to http://blockchain.info/address/1PSf86KnLuzM7Ris5kDhTEZwooR3p2iyfV - which represents 5+% percent of the total Bitcoin hashpower right now at a quick estimate. I have a bad feeling about this.
GPUmax? Would make sense if he needs to cover the tracks of his clients.