The 19 Watt ASUS Radeon HD5450 does not need an upgraded 400W power supply and therefore works fine with the 620 ALL MODELS Except the USFF. USFF systems have no slots and a laptop type Power Brick.
Here is example of GX280 doing the same thing.
Image may be NSFW.
Clik here to view.
Image may be NSFW.
Clik here to view.
