I have a 425 max watt & a 350 max watt. I would love to set my Sata drive as stand alone on separate PSU while still cabled to MoBo. I think the extra psu would have to be outside sys box n/p. I'm hesitant to try as yet because both psu's would need to power up simultaniously... I'm not sure how to configure the [power on] in the axt 20 pin on both psu's. Any idea's? I'm might just be board THnx!!!