Articles: Cases/PSU

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Cooler Master RS-500-ASAB, RS-600-ASAB and RS-700-ASAB

These three PSUs from Cooler Master all hail from the recently released GX-Lite series which is meant to be functional, yet also affordable.

The 500W model doesn’t fit into the wattage range designated in the Introduction, but it just goes together with its senior cousins.

The PSUs are shipped in small boxes with individual design.

The overall design style is uniform, yet each model has an individual color.

There’s a bare minimum of accessories inside: a user manual, a mains cord, and some mounting screws.

Exterior Design

The PSUs look simpler even than the RS-400-PSAP model from the Elite Power series which we criticized for overstating its real specs and offering a limited selection of connectors. The fan has a punched-out grid. The cables are not sleeved. The thin steel of the case is unpainted.

It’s quite a surprise to see an On/Off switch on the back panel, considering such harsh cost-cutting measures.

Circuit Design

The interior design of the two lower-wattage models is almost identical (the 500W and 600W models are shown in the top and bottom photos, respectively):

These are typical entry-level solutions without dedicated voltage regulation.

The single feature these PSUs can sport in terms of circuit design is active power factor correction.

The 500W and 600W models employ a CM6805BSX chip as a PWM & PFC controller. The chip can be found between the input capacitor and the front panel of the case.

Overall, the design looks outdated and primitive compared to the other PSUs in this review.

The senior model is more interesting, though.

It is obviously based on a different platform. The PCB wiring and the component layout differ.

A third choke is added in the output circuitry area, which means that this PSU, just like the Chieftec CTG-650C, supports dedicated voltage regulation based on magnetic amplifiers. Its output power is higher than the Chieftec’s (by almost 20% on the main +12V rail, which is a considerable difference) whereas its price is a little bit lower.

It is rather odd that the dedicated voltage regulation is not advertized on the manufacturer’s website while the interior design is only illustrated with photos of the junior models.

Each of the three Cooler Master PSUs features Teapo capacitors which are rated for an operating temperature up to 105°C (at the output) and 85°C (at the input).

The actual maker of each PSU is ATNG, a brand we’ve never encountered before. Judging by the specs, Cooler Master’s products are additionally improved compared to their basic versions from ATNG.

Cables and Connectors

The RS-500-ASAB and the RS-600-ASAB are equipped with the following cables and connectors:

  • One mainboard cable with a 20+4-pin connector (52 cm)
  • One CPU cable with a 4+4-pin connector (64 cm)
  • One graphics card cable with two 6+2-pin connectors (52+10 cm)
  • One cable with two PATA power connectors and a floppy-drive plug (48+10 cm)
  • Two cables with three SATA power connectors on each (49+11+10 cm)

The RS-700-ASAB model additionally has one more graphics card cable with two 6+2-pin connectors and one more CPU cable with a 4+4-pin connector.

The selection of cables and connectors is quite sufficient. However, the cables are very thin (20AWG compared to the standard 16AWG section) and are not sleeved. The connectors of the CPU and mainboard power cables are not easy to deal with because their parts do not hold tight together.

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