I have yet to see a PS with 22a on the +12v rail. I would venture to guess that 18 would be just fine.
-DFI Lanparty NF4 Ultra-D
-AMD 64 3000 Winnie
-eVga 6600GT (PCIe)
-Mushkin Dual Pack PC3200 (512 X2)
-80gb WD SATA HDD
-Creative Live! Series 5.1 surround sound w/subwoofer