Are you basing it just on the specs? I'm not saying the Mac Pro PSU isn't based on the circuitry and same internal parts as that thing, but the form factor is different than that in several ways. There is no integrated power switch, no rear fan, it is a front pusher rather than a rear puller that most Wintel boxes seem to use. The Mac Pro PSU is 10cm tall, 19cm wide and 20cm long. That PCP&C unit is 8.6x 15 x 23. The Mac Pro unit also has several plugs in the front rather than a single harness.