Efficiency

Using the results we gathered so far, we plotted a chart showing the PSU's efficiency at low loads and loads ranging from 10 to 110 percent of the maximum-rated capacity.




The platform is highly efficient in all load ranges. Above 70% efficiency with 2% load would be great, but most competing offerings perform worse.

10–110 % Load Testing

These tests reveal the PSU's load regulation and efficiency levels under high ambient temperatures and show how the fan-speed profile behaves under harsh operating conditions.


Despite its name, the Cougar Polar 1200 W doesn't have a problem under high operating temperatures. The best part is that fan noise doesn't spiral out of control since the fan-speed profile is relaxed.

Light-Load Testing

We measure the PSU's efficiency at loads significantly lower than 10 percent of the maximum capacity—the lowest load the 80 PLUS standard measures. This is important for when a PC is idle with its power-saving features turned on.


The cooling fan doesn't spin at light loads—not even at high ambient temperatures.

Super-Light Load Testing

We measure the PSU's efficiency with a 10 W load if its maximum power is 500 W or less in the following tests. If the PSU is stronger, we apply 2% of its maximum-rated-capacity load.


The PSU exceeds 60% efficiency with 2% load, but cannot surpass the recommended but not required 70% efficiency mark.

5VSB Efficiency

The 5VSB rail is highly efficient.

Power Consumption in Idle and Standby

Vampire power is below 0.1 W with both 115 V and 230 V input.