Corsair TX750W PSU

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The Corsair PSU has a single 60 Amp +12V rail which means regardless of what cables you use it will always provide the full capacity of the unit. While there was a time when more rails was thought to be better because it distributed the load, now we find ourselves with better engineering and components that can successfully make a solid single rail unit.

We've come full circle and more companies are cottoning onto this as the general level of engineering improves at the same time as high quality component prices come down. Some still claim it's more dangerous – if a very high current rail "pops" that's one hell of a bang, but the likelihood is so small and, as long as you buy a unit from a reputable supplier, it's designed and tested to withstand heavy stress prior to being shipped.

In this respect, we believe Corsair's design is better because it has this single +12V rail. However, because the load machine is limited to 300W per channel, we had to split this single rail between two or three loading channels since a 60A 12V rail should handle a maximum load of 720W.

During testing we found the (unmodified) Corsair TX750W remained cool to touch throughout the load levels, but did get noisy at high load. While it was definitely quieter than the PC Power & Cooling Silencer 750W, we feel that the airflow design could be improved significantly.

At 50 percent load the unit is very quiet and very tolerable, and even at 75 percent load when the fan noise increases a little, it's still quite quiet. However, the faster the fan goes the more air is pushed back out because of the poor internal design. The air coming out the honeycomb back of the unit is of low flow and quite warm in comparison.


That's some insanely high efficiency at 50 percent load! We obviously double checked and it was certainly genuine, but nearly 89 percent is unheard of. The normal operating value of a PSU is typically around the 50 percent mark, so this is certainly the right place to have optimum efficiency. Even then, it's not as if the efficiency drops as you increase the load as it still maintains a massive ~85 percent plus and keeps all its voltages green.

Apart from the fan noise and airflow, we can't fault this unit because it exceeds expectations on all accounts: it delivers an even better result than the PC Power & Cooling Silencer 750W PSU.