Simulated Load Testing
To provide accurate and consistent results in all of our PSU testing, Overclock3D uses professional grade DC electronic load equipment capable of placing a sustained load of 3690w across a total of six rails (including +5vsb and -12v) on the PSU! This is achieved by using a combination of SunMoon and Analogic electronic load equipment which allow us to adjust amperage loads in increments as small as 0.01A while also measuring voltage and wattage readings on-screen.
During today's tests, we will be placing the Cougar 1000CM under 25%, 50%, 75% and 100% load levels inside a hot box regulated to a temperature of around 50°C. Additional 'Cross Load' and a 'Max Load' tests will also be performed under these conditions to simulate how the PSU reacts to heavily uneven loads as well as running above its specified output.
HEC Compucase Cougar 1000CM Results @ 50°C
| || +3.3v || +5.0v || +12v || +5vSB || -12v || AC Watts / |
| Efficiency || Intake / |
| Δ Temp |
|Test 1 |
|5.25A ||5.25A ||16.75A || 1.00A || 0.20A || 288w / |
| 88.54% ||50.8°C / |
|3.36v ||5.03v ||12.10v ||5.04v || -12.07v |
|Test 2 |
|10.50A ||10.50A ||33.50A ||2.00A || 0.40A || 563w / |
| 89.87% || 50.2°C / |
|3.31v || |
|12.04v ||4.96v || -12.08v |
|Test 3 |
|15.75A ||15.75A ||50.25A ||3.00A || 0.60A || 851w / |
| 89.18% ||53.2C / |
|3.22v ||4.90v ||11.84v ||4.89v ||-12.11v |
|Test 4 |
|21.00A ||21.00A ||67.00A ||4.00A ||0.80A ||1155w / |
|86.49% || 50.3°C / |
|3.21v ||4.81v ||11.70v ||4.83v ||-12.12v |
|Test 5 |
|21.00A ||21.00A ||1.00A ||0.00A ||0.00A || 233w / |
|79.39% ||50.6°C / |
|1.0 °C |
|3.32v ||4.93v ||12.16v ||5.06v ||-12.09v |
|Test 6 |
| 1.00A || 1.00A || 77.00A || 0.00A || 0.00A ||1069w / |
|89.61% || 53.0°C / |
| 13.0°C |
|3.32v ||4.98v ||11.94v ||5.03v ||-12.12v |
|Test 7 |
| 21.00A || 21.00A ||70.00A || 4.00A || 0.80A ||1257w / |
|82.02% || 53.3°C / |
| 23.8°C |
|3.22v ||4.82v ||11.70v ||4.82v ||-12.12v |
HEC Compucase Cougar 1000CM Performance Overview
| +3.3v Diff. |
| +5.0v Diff. |
| +12v Diff. |
|Avg Effic. |
|Noise Rating |
|-4.46% || -4.37% ||-3.30% ||88.52% ||Low |
Starting off with the performance overview chart which shows the fluctuation in voltage between Test 1 and Test 4 results, we can see that the Cougar 1000CM manages fairly reasonable voltage stability with less than 5% fluctuation between idle and load on the +3.3v and +5v rails. The +12v rail rail also performs reasonably well with 3.30% fluctuation between Test 1 and Test4. However, when comparing these results to other PSU's tested recently the Cougar 1000CM doesn't quite make it into our top 10. PSU's such as the Corsair HX850w and PCP&C Silencer 910w have shown to be capable of less than 1% fluctuation on the +12v rails and around 2% on the +3.3v and +5v rails, offering much tighter voltages between idle and load.
During the cross-load tests 6 & 7 the Cougar copes surprisingly well with no out-of -check voltages at all. Only the efficiency takes a nose-dive during test 5, dropping to just under 80%. This is a fairly surprising result considering the average results from the other tests so far, but very few PSU's pass these tests so the Cougar deserves a few points here at least.
Finally in the MAX Load test, it is quite obvious to see that the Cougar 1000CM is already stretched to its limits as far as power output is concerned. Although the unit was briefly capable of up to ~1400w before OCP/OPP kicked in and shut it down, the maximum sustainable load was just 1031w. Obviously at this load the voltages were quite similar to those at 1000w in Test 4 with the only difference being a 4% lower efficiency at 82.02%.
And now we hit the major snag. The ripple output across all rails on the Cougar 1000CM was quite frankly shocking! Actually scratch that...I don't think there is a word which can describe how appalling 144mV of ripple on the +12v rail is during Test 1! This is already outside of ATX specification
which states that ripple should be no higher than 50mV on the +3.3v/+5v rails and 120mV on the +12v rails, and we havent even applied any significant load yet! Similary the +3.3v and +5v rails are also cringe-worthy topping out at 118mV and 106mV respectively.
Fast forwarding to Test 4 and as you'd expect, things only get worse. 194mV of ripple on the +3.3v rail, 192mV on the +5v rail and 212mV on the +12v rail. It's almost like somebody forgot to solder in the capacitors! At this point we actually uplugged the Cougar from the testing equipment and tried a different PSU in there to make sure that there wasn't an issue with our load tester. There wasn't.
The strange thing is that most of the high ripple output is attributed entirely to infrequent spikes. Sometimes they would only be as high as 100mV while other times they would go completely off the chart and hit closer to 300mV. If it wasn't for this the average ripple of the 1000CM could actually be quite reasonable.