Zippy Emacs PSL-6850P G1 850w PSU


Load Testing

In order for the results from all current and future PSU reviews to remain fair and comparable, Overclock3D uses a custom built Power Supply load stress tester. The tester will be placing the following loads on each of the PSL-6850P's rails:

+3.3v - 20a Load
+5.0v - 20a Load
+12v - 60a Load

The results are collected from a Mastech MAS-345 Multimeter which logs its readings via RS232 to a PC.

Zippy Emacs G1 850w +3.3v Zippy Emacs G1 850w +5.0v

Zippy Emacs G1 850w +12v

All rails on the PSL-6850P remained well within ATX specifications throughout the testing. The +3.3v and +5v showed the least fluctuation of between 0.01v-0.04v, with the +12v rail suffering from slightly more fluctuation but still performing reasonably well considering the load it was placed under.

Efficiency Testing

Efficiency tests are performed by measuring the wattage consumed by the power supply at the mains against the power (in watts) consumed by the OC3D power supply stress tester. These results may not be 100% accurate, but have proven to be extremely close to results obtained from professional equipment.

Zippy Emacs G1 850w Efficiency

The PSL-6850P was placed under a load of 886 watts. This counts for a total of 104% of the power supplies rated output. At this load, the power supply required 1042 watts from the mains. Therefore the efficiency of this power supply can be found by a simple equation: (886 / 1042) * 100, which works out to be an efficiency rating of 85.0%.

Noise Testing

Possibly the hardest part of any PSU review is summarising the level of noise given out by the unit. The threshold for what is considered 'noisy' varies from person to person and therefore what I may consider a quiet unit, another person may consider extremely loud. A common way to resolve this issue is to use a dBA meter to measure the units noise level, however this doesn't take into account the pitch (type) of noise emitted and whether it is likely to irritate end users.

For this reason OC3D records all power supplies at idle and load in wav format for you to make your own informed decisions. All recordings are taken at 30cm away from the PSU and outside of a PC case. You will need to remember that noise levels will be reduced by varying amounts once the PSU has been installed inside your PC enclosure.

Idle Recording - Download
Load Recording - Download

After finding out that the PSL-6850P was cooled by two 44dba+ fans, I must admit thinking that this was going to be one very loud PSU indeed. However, it would seem that Zippy have done a good job of controlling the fan speeds at idle and under medium load with the unit sounding significantly quieter than I was expecting.

At full load, the fan speed slowly increased to counteract the extra heat being produced by the unit. This in turn increased the noise output of the unit significantly making it rather loud - as you will be able to hear from the recordings above.

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Most Recent Comments

14-11-2006, 14:05:41

Mixed feelings with this one tbh. Unsure if I really like it or not :|Quote

14-11-2006, 14:32:39

simon d
I was thinking about this PSU, but I will wait until the new ATI DX10 card come out first and quad cores. I was hoping for 4x PCI-E connectors.Quote

14-11-2006, 14:46:02

Originally Posted by name='simon d'
I was thinking about this PSU, but I will wait until the new ATI DX10 card come out first and quad cores. I was hoping for 4x PCI-E connectors.
On looking at Zippy's site today it does look like they have a version of this PSU with 4xPCIE actually. I'll find out what the deal is.Quote

14-11-2006, 20:15:04


14-11-2006, 20:39:44

Looks to be a good solid PSU despite it's minor placement/cooling flaws.Quote

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