Articles: Cases/PSU

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Unfortunately, the CMPSU-750TX had some problems in the UPS compatibility test. Together with an APC SmartUPS SC 620 it worked at loads up to 365W (from the mains) and 350W (from the batteries). This result would be good if it were not for one thing: when the load was higher than these values, the UPS didn’t just report overload but shut down instantly.

The PSU worked normally at full load.

The high-frequency output voltage ripple is within the norm. No low-frequency pulsation was observed in this test.

The cross-load diagram looks very good: the PSU copes easily with every load balance. The +12V voltage never deflects more than 2% from the nominal value. That’s dedicated voltage regulation for you!

Alas, this PSU proved to be rather noisy. The fan is never slower than 1100rpm but it is audible even at that speed in a quiet PC. The fan speed grows up linearly at loads above 350W, reaching 2000rpm at the maximum. The CMPSU-750TX seems to be average in terms of noisiness. It will satisfy most users, but won’t be liked by people who prefer silent computers.

The efficiency and power factors are all right, reaching 85% and 98%, respectively.

So, the Corsair CMPSU-750TX can be recommended for owners of very advanced PC configurations, for example those that include two graphics cards, but with two limitations: if you plan to use an UPS, you should select the latter with a higher wattage rating than actually necessary. And second, this PSU may not suit people who have a quiet PC. Otherwise, this is a good model with high wattage, superb stability of the output voltages, and a rich selection of connectors.

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