Deepcool PX1200G ATX 3.0 PSU review

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Deepcool PX1200G (ATX 3.0 compatible) power supply

Today, we’re putting the new Deepcool PX1200G - a 1200W power supply on our test bench. It is the first ATX 3.0 compatible unit from that company that we looked at. Deepcool PX1200G is a fully modular PSU; even though the motherboard connectors are not permanently attached to the housing, you still must use most of them. Nearly all cases have a power supply shroud now (at least ATX-sized ones do), so the unit and the cables (with ribbon design for enthusiasts) will be hidden in most scenarios. There are two color variants, as white is available, besides the tested black color. As for the wattage options, you can find the following:

  • 1200 W (which we’re checking)
  • 1000 W
  • 850 W

Deepcool PX1200G has ATX 3.0 and PCIe Gen 5.0 compatibility. What does it mean in practice? Mainly, it’s the implementation of the PCI-Express 5.0 generation’s power connector. These new power supplies carry the latest 12VHPWR power connector designed to deliver up to 600W of raw, unhindered power to the graphics card. Compared to ATX 2.X, which supports high load peaks but does not define a maximum above the nominal power of the power supply, ATX 3.0 represents clear target values - specifically, the PCIe connection for the graphics card must allow load changes of up to three times the power consumption. Additionally, all PX series models/wattage offer three “traditional” PCIe 6+2 connectors for complete compatibility with the graphics card. 


Under the hood, we have CWT’s (well-known for its quality and reliability) CSZ platform (the same as in the Montech Titan Gold) – which offers ATX 3.0 compatibility and good performance. Deepcool PX1200G 1200W is an ATX power supply with a semi-passive mode. This time, it’s a 1200 Watt model (in black) with an 80 PLUS® Gold certificate, meaning it’s 90% efficient at 50% load @ 115 V and 92% efficient @ 230 V. It is crucial because less consumed energy goes to waste (at least not in a significant amount), and that should affect your energy bill. It is essential in these wicked times, where energy prices skyrocketed and won’t become cheaper. Speaking of the fan – it’s 135 mm with PWM control that allows lower noise and keeps thermals in check. It’s possible to turn off the fanless mode. The PX-G boasts a dual 105C Japanese main capacitor topology, enabling the power supply to maintain a hold-up time of ≥16ms under full load. Despite its powerful capabilities, the PX-G maintains a compact size, measuring just 160mm.


The 1200 Watts available in the reviewed unit should be enough for most users; even an i9 13900K combined with the Geforce RTX 4090 shouldn’t be a problem. Deepcool PX1200G is built with 100% Japanese capacitors and other premium components to achieve 80 Plus Gold Certification; thus, it enhances reliability and durability. The unit is compact, measuring 160 mm x 150 mm x 85 mm. A 10-year warranty backs Deepcool PX1200G. The MSRP is 239.99 USD. Okay, let’s check out this PSU from Deepcool, shall we?  

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