Cooler Master GX III 1250W ATX v3.0 PSU Review

Box & Bundle

The box generally provides good protection, thanks to its sturdy construction and foam material at its internals. On its front side, besides the PSU’s photo and model number, you also get the ATX v3.0 and PCIe 5.0 badges, which look outdated since newer revisions exist. Around the back, you will find more technical details.

Product Photos

The design makes it stand out from the crowd, but I disapprove of the restricted fan grille, which affects airflow and thus requires higher fan speeds. With a less restricted fan grille, noise output could be lower. The modular socket has thirteen (13x) sockets to smoothly deliver the PSU’s full power.

Cables

Modular Cables
Description Cable Count Connector Count (Total) Gauge In Cable Capacitors
ATX with 20+4 pin connector (610mm) 1 1 18-22AWG No
4+4 pin EPS12V (600mm) 1 1 18AWG No
8-pin EPS12V (600mm) 1 1 18AWG No
6+2 pin PCIe (550mm) 3 3 16-18AWG No
12+4 pin PCIe (650mm) (600W) 1 1 16-28AWG No
SATA (500mm+120mm+120mm+120mm) 3 12 18AWG No
4-pin Molex (500mm+120mm+120mm+120mm) 1 4 18AWG No
AC Power Cord (1360mm) – C13 coupler 1 1 18AWG

The EPS cables should be longer than the ATX, with at least 650 mm in length. The gauges ideally should be thicker at 16 AWG on the ATX and EPS cables for lower voltage drops at high loads since this is a high-capacity PSU.

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3 thoughts on “Cooler Master GX III 1250W ATX v3.0 PSU Review

  1. I believe the images are not for this PSU in page 3, and instead are from the SeaSonic series. Notice the AC mains connector is using a different connector than the one in Page 2. Also, there is no “purple” anodized heatsinks, everything’s just black. Refer to the GX III 1050W review to see how it should look. Please fix this problem, thank you.

      1. Excellent! Checking the review gallery now.

        Also a big thanks for your exact component part number listings on page 2 of each variant of this PSU’s family (1250W, 1050W, 850W, 750W), it helped me a great lot to decide exactly which one of them to consider buying. Shame that Cooler Master doesn’t publish this information, but I always prefer to actually do a comparison between the internal components before considering to purchase a product, so as your review are an excellent source of information, thank you!

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