I want another opinion about running a G4 500mhz AGP with 2 ATA hard drives(120gb + 27gb) AND a SCSI hard drive internally. I just got my mac and am looking to upgrade it. I noticed the manual mentioned either two ATA's, one ATA and one SCI, or three scsi drives. I just added the 120gb drive and then realized my SCSI PCI card could run a drive also. AM I going to over tax the power supply? Thanks for your help.