Thermaltake Toughpower XT 775w

7.5 Overall Score

5 Year Warranty, Modular Cabling, 80 Plus Bronze Efficiency Rating, Good Voltage Regulation and Ripple Characteristics, Reasonable Price

Sleeving Does not extend into the PSU casing, Some Teapo Brand Taiwanese Capacitors


As always, testing is performed with XCPU’s SunMoon SM-5500ATE PC test load. This complex and rather expensive piece of equipment is designed and built to stress and test computer power supplies. As such, it is the ideal tool for doing load testing. Coupled with a low-bandwidth PC based oscilloscope, the setup makes for very easy and accurate power supply testing.


Testing consists of four main tests, and two crossload tests. The four main tests are meant to simulate a normal computing environment, where each test is an increment of 25% of the power supplies’ rated capacity. (25%, 50%, 75%, 100%) The two crossload tests are meant to test the ability of the power supply to operate in uncommon situations. The first test draws a lot from the 3.3v and 5v rails, while pulling a miniscule 1A from the 12v rail. The other crossload test is a large load on the 12v rail, and only 1A on both 3.3v and 5v rails. Older systems (Pentium II/III) use a lot of 3.3v and 5v power, and modern systems use a lot of 12v power, so these crossload tests help to demonstrate that the PSU can handle anything thrown at it.


The temperature in the room was kept at a constant 70F (21C) during the tests.


First, let’s take a look at the specifications for the PSU as shown by Thermaltake:



The Thermaltake Toughpower XT 775w has one 12v rail, with a maximum capacity of 64A or 768w. Both the 3.3v and 5v rails are rated at 25A, with a maximum load between the two of 150w. Obviously the total continuous power output is 775w.


Let’s see how she fares on the Sunmoon:



All of these numbers are simply excellent! Voltage regulation is WELL within ATX specifications, even under the harsh conditions supplied in the crossloading tests. The 12v rail is especially impressive, staying within 1% of 12v. Also, note the very high efficiency in all tests. Staying above 80% on both crossloading tests is no easy task. The efficiency on this PSU has justified and surpassed it’s 80 Plus Bronze rating. In fact, according to our testing, the unit would only have missed a 80 Plus Silver rating by a less than one percent on test 4.


Overall, this PSU has done wonderfully as far as voltage regulation is concerned.


Let’s move on to the ripple testing:


Test 1- 3.3v 5v 12v


Test 2- 3.3v 5v 12v


Test 3- 3.3v 5v 12v


Test 4- 3.3v 5v 12v


Test CL1- 3.3v 5v 12v


Test CL2- 3.3v 5v 12v


Nothing out of the ordinary here. The ripple slowly increases as the load increases, which is to be expected. The 3.3v and 5v ripple are very low in most of these tests, which is good. The 12v rail however isn’t perfect. The ripple gets up to a level of just above 40mV, which considering that the ATX specification is 120mV, is quite acceptable. Many of today’s best models can do somewhat better than this, but 40mV is nothing to worry about at all.

Note: Specification states that the maximum ripple on the 12v rails is 120mV, and the 3.3v and 5v rails are 50mV.

ADDENDUM: Just for fun, we left the Thermaltake Toughpower XT 775w unit on our test bench running at well over it’s rated specs- near 870w DC load- for about 30 minutes. It ran just fine, with voltages and ripple well within ATX specifications. The fan did spin up to maximum speed, however.


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