The dedicated voltage regulation brings the predictable effect: the +12V and +3.3V voltages stay within a 3% deflection. The +5V deflects more than 3% but only at extreme loads.
You can note that the diagram begins at zero on both axes: the PSU is indeed stable at zero load.
Output Voltage Ripple
This diagram resembles the one of the Antec Signature: there is considerable high-frequency pulsation with occasional tall spikes. There are no serious problems here, though.
Fan Speed Control
The PSU uses a 135x135x25mm Globe Fan RL45 fan. It is an ordinary 3-pin fan, unlike the 4-pin fans of Enermax’s MODU82+ and PRO82+. The PSU has a tachometer output you can connect to the mainboard and control the fan speed from BIOS or with Windows-based tools.
The fan speed is constant at about 700rpm until a load of 550W when it begins to grow up linearly. However, even at the highest load the speed is only 1120rpm, making the Revolution 85+ a very quiet power supply.
Besides, the manufacturer claims the design of the PSU case with the rolled-in edging of the fan hole reduces the noise by 1-2dB more. I could not check this out as I didn’t have a sufficiently accurate noise-measuring tool.
When the PSU is turned off, the fan keeps on running at a low speed for 45 seconds.