Silver Power SP-SS750M 750w Review
Published: 27th May 2010 | Source: Silver Power | Price: £94.58 |
Simulated Load Results (Graphs)
As per usual I'm going to be conducting the testing of the Silver Power 750w on OC3D's trusty SunMoon SM-268+ DC load tester. This equipment is capable of placing a user specified load on all of the PSU's rails (+3.3v, +5v, +12v, -12v, +5vSB) up to a maximum load of 1680w. Ambient temperature will also be maintained at Sahara-like temperatures of 50°C (±5%) with all results being recorded using a Fluke Digital Multimeter and Thermometer.
For those of you not familiar with the layout of our relatively new graphs, the highest and lowest values on the Y-axis (voltage) represent the maximum and minimum voltages allowed by ATX specifications. If the results should fall outside the graph at any time, then that's an instant FAIL. However, merely staying inside these boundaries does not necessarily indicate a good PSU. In order to display truly great voltage regulation, a PSU must stick as closely as possible to the thick white horizontal line (ideal voltage) as possible.
You will also notice that the graph is split into three sections as depicted by the Green, Amber and Red backgrounds. These indicate normal usage (green), heavily uneven load distribution (amber) and overloading of the PSU (red). For the most part all we need to worry about is how it performs in the green section, but good performance in the other sections will undoubtedly earn the PSU extra brownie points.
Both the +3.3v and +5v rail voltages start a little on the high side in the first of the tests at 3.41v and 5.16v respectively. Normally this would be an early warning that the output voltage is likely to dip significantly as load is applied and that the manufacturer has set the voltages higher to counteract this. However, in the case of the Silver Power 750w this couldn't be further from the truth. Those lines are about the straightest lines I've ever encountered from any PSU, and if Silver Power were to drop the idle voltages just a tad, the results could have easily been sitting proud with the white line. Even when a wonky cross-load is placed on the rails there is very little effect. Simply awesome.
The +12v rail tells a similar story with a rather high idle voltage and only a minor droop in voltages as increasing load is applied. Once again the PSU is totally unfazed by cross-loads on either the +3.3v & 5v or +12v rails and even the max load results where the PSU is pushed to a whopping 930w the output voltage doesn't drop below 12.06v. Oh and yes, you heard that right....the Silver Power can put out almost 200w more than its rated 750w output.
As seen back on the introduction and packaging pages, the Silver Power 750w is 80PLUS Silver certified. This guarantees that the PSU will have an efficiency level of 85% at 150w and 750w loads along with 89% efficiency at 375w. As we can see from the graph above the unit has absolutely no trouble meeting these targets, consistently delivering between 89-90% efficiency. Of course, we need to bear in mind that those running from 120v mains (N.America / Japan) will see slightly lower results than these due to our 240v mains setup. But even with a 1-2% drop in efficiency the Silver Power unit should still have no problems living up to its certifications.