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PSUs
While a new CPU or graphics card could make a noticeable difference to which games and applications you can run on your PC, without a stable supply of power, all the costly upgrades you've made to your PC won't be worth a bean.
Corsair TX750W
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Verdict: Keenly priced and efficient, but the fan is noisy at full load.
Unlike the other two Corsair PSUs in this Labs test, the TX750W has integrated captive cables.
Captive cables make it harder to build a neat and tidy PC, but they're cheaper to produce and slightly more energy-efficient than modular cables. As a result, the TX750W is nearly £10 cheaper than the modular-cabled HX620W.
Like several other manufacturers, Corsair has dropped the trend of dividing the 12V power into multiple rails in its latest PSUs, and as a result, the TX750W has a single 12V rail rated up to a hefty 60A. Obviously, no single component needs this much power, but having all the 12V power delivered on a single rail is more energy-efficient than splitting it across several rails. In addition, it means that there's no chance of a particularly power-hungry component not receiving enough power, as may happen with a PSU that has multiple low-wattage 12V rails.
Combined with the other rails, this means that the TX750W is rated to deliver up to 750W at 50ûC, 10ûC higher than most other PSUs. A temperature-controlled 140mm fan cools the inner workings of the TX750W, and is quiet at 50 per cent load but noisy at full load.
The TX750W was able to produce its full 750W rating with stable voltages from all its rails. It's also very efficient at full load, averaging 84 per cent, requiring 891W from the mains to produce 750W.
However, the TX750W is let down by its inclusion of the noisy fan, as otherwise it would have been a very tempting proposition due to its high efficiency and low cost.
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