Nexus RX-6300 was a really nice surprise, with efficiency between 83.2% and 86.6% in our tests. Although it is not 80 Plus certified, it achieved a performance that would easily get an 80 Plus Bronze certification, if the manufacturer wanted to.

We could easily deliver its labeled power at 50º C and we could overload this baby up to 840 W without burning it.

All voltages were within a tighter 3% margin while ATX specification allows a 5% margin, meaning that all voltages – including -12 V – were closer to their nominal values than necessary. The exception was when the unit was delivering up to 265 W, when +5 V output got 0.01 V above this tighter margin.

Noise and ripple were low at all timess and, although we didn’t measure it, the noise level produced by the fan was really low.

The number of cables is perfect for a 630 W unit.

The only “problem” we see with this power supply is its price. You can find 750 W power supplies from Seventeam (ST-750P-AF and ST-750Z-AF) costing less, although these models present efficiency a little bit lower than RX-6300.

In summary, it is a good buy for the exigent user, even though we’d like to see it being sold for at least USD 10 less.