Cooler Master Silent Pro Gold 450W and 550W preview

A couple of months ago, Cooler Master introduced two new products in its Silent Pro Gold power supply series. We tested both of them, with capacities of 450W and 550W.

With the new Silent Pro Gold power supplies, Cooler Master wants to offer efficient 80 Plus Gold PSUs for an affordable price. The 450W model costs £50 and the 550W model costs £60. That makes the 550W model cheaper than most other 450W of 500W Gold power supplies on the market.

The two Silent Pro Gold PSUs appear to be based on FSP Aurum models and likely come from the Fortron factory. Both have a single rail design, where the 450W model can supply up to 35A on the 12V cables, and the 550W model up to 42A. That means that both power supplies can supply most of their capacity on the 12V rail. On the 5V and 3.3V rails they supply up to 24A.

The number of connectors is identical on both: 3x molex, 1x floppy, 6x SATA and 2x 6/8-pin PEG. While they're not modular, which you can't expect in this price range, all the cables are sleeved.

The power supplies have 12cm fans, and how fast they spin depends on the load. There's no power switch, and they weigh 1.5kg.

The design is modest but sleek, fine for this segment. How they perform is much more important, so let's get to that.

For testing power supplies we utilise professional Stratron load generators, which allows us to put a load of up to 1,600W on PSUs in our test lab. Each PSU we test in increments of 100W up to the maximum load. At each step we measure voltages on the different lines. The closer those measurements are to the official values of 3.3V, 5V and 12V, the better. More than a five per cent deviation is good. You can read rest of the Cooler Master Silent Pro Gold 450W and 550W preview on