Thermaltake Toughpower Grand 1200W - Testing the Grand 1200W

Article Index
Thermaltake Toughpower Grand 1200W
Closer Look, Features and Specs
Cables and Test Setup
Inside the 1200W Grand
Testing the Grand 1200W

Testing - 24W, 380W & 1156W: 

We initially plugged the PSU into an EZ PSU Tester 3 in order to power it on for our "idle" measurements.  As noticed below, the voltage rails were fairly stable with no load, but these aren't necessarily indicative of overall load performance.  According to our Kill-a-Watt, the power draw was 24W.  I was surprised that without any load at all, the PSU draws that much power.  No doubt it is due to the large fan, lighted switch and flashy LED logo on the rear of the unit.  We thought these results would be interesting to include and compare with other power supplies to see how they manage a non-load situation, and how much power the PSU itself will draw.





As I expected with I was given the opportunity to look at this high-end 80PLUS Gold PSU, no matter what type of load I put on it, the voltage rails stayed fairly clean and the noise remained within ATX specification limits.  As you can see by clicking the images above, with a moderate load we captured a 34mv ripple & noise measurement on the 3.3v rail, again - 34mv on the 5v rail and 68mv on the 12v1 line while the 12v2 line was a bit "noisier" at 80mV.  This isn't as clean as some, but as ATX specifications state 50mv is allowable on the 3.3v and 5.0v rails while 120mv is acceptable on the 12v rails - this is still well within specs.  Even with a heavy load the Thermaltake Toughpower Grand 1200W PSU stayed within specifications on the rails.  The 5v line maxed out at 38mv while the 3.3v line remained acceptable at 40mv.  The +/- 12v lines wandered a bit, but stayed under 120mv and this is still within specifications - but a good 20%.  This is a pretty solid result - even with a massive 1156W load.  

Instead of taking a ton of pictures of each voltage line under different load, we've graphed the results below.



The voltage is very solid with the Thermaltake Grand 1200W unit, and as is the case with most powersupplies, it tends to be a bit on the high side. The biggest drop in voltage when a load is applied to any of the rails is 0.4v.  On the 3.3v line we see a drop of a mere 0.05v - almost perfect, and on the 5v rail we see a drop of 0.08v - a very solid result.  The +12v1 rail drops 0.4v, but it still remains slightly above 12v at 12.1v and is very stable.  The heavier 12v2 rail drops 0.2v - even with a huge load applied and bottoms out at 12.3v.  The -12v rail drops 0.2v, but the 12v rails are allowed to fluctuate an incredible 1.2v and still stay within ATX specifications.  Thankfully, they are much more solid than that. 


The Thermaltake Toughpower Grand 1200W Power Supply is in the top dog over in the Toughpower Grand series from Thermaltake but has some bigger siblings to try and live up to.  Thermaltake has a 1275W 80Plus Platinum unit that outperforms this one, as well as a massive 1500W 80Plus Silver unit.  That being said, I don't know how you'd push this unit to the bleeding edge - even with a few new Radeon 7970 cards in your system.  Our test system included a pair of Radeon 4870, an Intel Core i7 2500K CPU, several hard drives and more and it handled it easily.  In order to make the power supply sweat, we plugged it into a heavy 12v load and watched the power draw climb.  It pushes out a lot of watts through both +12v lines and proves to be solid, stable and it runs quite cool.  The hottest internal component reached 52°C when testing in our office with an ambient of 25°C.  It handled everything we threw at it without stumbling, stuttering or any undue concern.

There really isn't much of a downside to this PSU.  It is nice and quiet.  It earns its "Gold" rating by being at least 90% efficient and is a great power supply that certainly deserves some consideration.



  • Low electrical noise
  • Math specs it out over 1500W - so should handle load
  • Great physical design and looks
  • Lots of peripheral and SATA connectors
  • Stable under massive load 
  • 14cm fan is very quiet and cools well
  • Standard size should work in almost every system.


  • Will set you back ~$300
  • Power lines not as clean as other Thermaltake PSUs we've tested




Thermaltake has a rock-solid, well designed PSU on their hands with the 1200W Toughpower Grand series PSU and it weighs in with a "Silver" award here at BCCHardware for performance and overall quality. 

If you have any questions or comments, please post them in the forum at the "Comments" link below.