Summary: We were a little bit disappointed with Nexus RX-8500. Since it is part of the same series as
we expected it to achieve a higher efficiency. RX-6300 uses a partial synchronous (i.e., instead of using rectifiers on the +12 V output it uses MOSFET transistors) and this explains the better performance from this 630 W model.
Summary: The Nexus RX-8500 is a quiet power supply at low power loads, modestly quiet at middle loads, and quieter than most competitors at very high loads. Unlike some of its precessors, this Nexus has a fan speed controller that is more linear in its response to temperature rise, at least to about 400W. The rate at which the noise rises is a bit quicker than most every other PSU tested in the anechoic chamber.