Cooler Master Real Power RS-450-ACLY Power Supply

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The RS-450-ACLY follows the familiar design used by most 120mm fan PSUs. A nicely open honeycomb pattern grill covers most of the exhaust side, which sports a power switch and the AC input socket. Because it has auto-range input , no 110/220 VAC switch is needed. A blue LED fan is used.

Blue light... presumably to illuminate the interior of a windowed case.

There are no vents at all other than the exhaust grill.

The cover is fitted very tightly, suggesting high mechanical integrity. The interior is quite packed, with fairly small heatsinks. An interesting feature is a piece of black plastic wedged between the heatsinks, behind the center yellow-topped transformer. It seems to be there to act as a 90 degree angle deflector for airflow to be directed towards the transformer and the exhaust grill. It suggests that there must be a significant degree of back pressure for the fan airflow -- i.e., it bounces back towards the fan, reducing effective airflow and increasing turbulence.

Packed interior.

Photo edited heavily to show airflow deflector behind transformer.

The fan is a Cooler Master brand dual ball-bearing, rated at 0.38A. This suggests high speed capability and noise.

Cables and Connectors

There are a total of seven quite long cable sets.

  • 23" sleeved cable for main 24-pin ATX connector (24-to-20 pin adapter adds 6")
  • 23" cable for dual 12V connector
  • 2 x 34" cable with two 4-pin IDE drive connectors and one floppy drive power connector
  • 34" cable with three 4-pin IDE drive connectors
  • 31" cable with two SATA drive connectors
  • 30" long cable for front panel power meter (+ 6" lead on power meter)
  • As in the Nexus NX4090, they have done away with the 3.3V line / connector, which is useless for 99.9% of users.

The longest cable is almost a yard.

The familiar 4-pin plugs have been replaced by a blue colored version with side tabs that make removing the plug much easier. Instead of the usual rocking side-to-side that's often necessary and totally awkward in tight spots after drives are installed, you only have to squeeze on both sides, and the tabs push against the mating connector to loosen off the plug. It works well.

Much easier to unplug: Just squeeze the sides.

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