Thermaltake ToughPower XT 775w PSU Review
Published: 10th May 2010 | Source: Thermaltake | Price: £87 |
Simulated Load Results (Graphs)
As per usual I'm going to be conducting the testing of the Thermaltake ToughPower XT 775w 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.
OK, so starting with the +3.3v rail we can see that Thermaltake have set the idle voltage quite close to the +3.3v baseline. This is normally great if the PSU has rock solid regulation, but unfortunately in the case of the XT, the voltages dip a fair bit through the testing ending up at 3.21v by test 4. Don't get me wrong though, this result is by no means 'bad' - it's just not the leader of the pack either.
The +5v rail also takes a similar hit in voltage between test 1-4, but in this case Thermaltake have set the idle voltage a little higher, adding some cushioning for when the load is increased. The cross-load and max-load results are actually extremely good with little signs of the PSU struggling to balance an uneven load or cope with running outside its rated spec.
And here we have the star of the show, the +12v rail. That rail is so solid that Vin Diesel would be shaking in his boots. Seriously, a drop from 12.10v to 11.96v is nothing at all and once again the cross-load and max-load results are also pretty awesome. Oh and in case you've been wondering: Yes, the XT 775w did manage to hold a whopping 990w load without breaking a sweat!
Finally it's the tree hugging bit. Thermaltake have had the XT 775w certified as an 80Plus Bronze unit which essentially means it must be 82% efficient at 155w / 775w loads, and 85% efficient at 387w. As we can see, that's absolutely no problem for the XT with ~88% efficiency being exhibited throughout most of the tests apart from cross-load test TX1 (that 80Plus don't test) where it dropped to just over 80%.
If you're interested in how the XT performed under the oscilloscope. Read on....