Test setup

Generally speaking the there are three different tests. First of all Plug Load Solutions goes for 20 percent load on the power supply. At this point they measure input and output power and calculate the efficiency as a result. Furthermore they monitor the different voltages - +12V, -12V, 3.3V, 5V and 5Vsb. With these values taken one can see whether the power supply complies with a five or a ten percent deviation standard. After that they do also keep an eye on power factor correction, concerning which 1 is the ideal value.

In case somebody is looking for further information on how 80Plus.org conducts it tests, then we can recommend the following PDF.

Performance values at 20 percent load

Performance values at 50 percent load

Performance values at 100 percent load

Average Values

Input/Output Power and Efficiency

Conclusion

With the Silencer MK III 750 Watt, OCZ presents a very good and solid power supply. 91.30 Percent efficiency at 50 Percent load is a very good value and as a result thermal dissipation power is low. This implicates a noise level which is low too because there isn't much heat to be removed by a fan. Once put in silent mode the fan is being turned off as long as the load stays below 50 percent, which is remarkable. Always practical is a cable management and furthermore we like the number of integrated cables. There really is enough in the delivery to make any enthusiast happy.

A cable management is always a good thing because of the simple reason that it allows users to only connect cables they really need. Therefore a system can be wired as neatly as possible. Unfrotunately OCZ chose to equip this PSU with male connectors on the PSUs side. This means that if you were to forget to put the plastic caps back on the connectors you can easily shorten the PSU.
With four molex connectors and twelve SATA connectors it shouldn't be a problem to wire a high-end system. Also the fact that you can natively connect a two-way-SLI/Crossfire setup shows the Silencer MK III's preferred field of application. There is even plenty of power left to overclock a setup which uses three cards.

If we look at the performance values, the OCZ Silencer MK III 750 Watt shows very good stability under load conditions. If we look at average deviations, we see that the results at 3.3 Volt and 5 Volt with 20 and 50 percent load deaviate a bit more than other PSUs in our list. Never the less there is nothing to worry about since the values are still perfectly within the ATX specs. Convincing that's what the efficiency is.