ikissfutebol :
So in an i5 6500 mITX build using bus-powered graphics, is this a viable PSU? Sounds like it's either on tier 1 or 3.
It's viable for anything up to 500 watts, since it stays inside specifications on the whole load range; unless your graphics card draws more than 216W from the PCIe cables, since their rail's overcurrent protection is rated at 18A (216W). Graphics card also take power form the PCIe motherboard connector (specified for 75W, but can go higher) which is on a separate rail.