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Feature Highlights of the Cooler Master Real Power
550 RS-550-ACLY
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| FEATURE & BRIEF |
COMMENT |
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Compliance with the newest Intel standard ATX12V v2.01 and
the newest SSI standard EPS12V v2.1
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No longer the newest of
either standard, but changes to the newer revisions are minor. |
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Super silent operation with intelligent fan speed control (<23dBA)
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We measured the 450W
model at 23 dBA/1m. Can the 550W match this number? |
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Power consumption management by human computer interface (HCI)
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I'd call it monitoring,
not management. Use Cool 'n' Quiet if you really want power management. |
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PCIe connector satisfy high end graphic card requirement
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Almost mandatory on power
supplies of this size. |
Support +12V1, +12V2
and + 12V3 outputs for higher power usage
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In compliance with the
EPS12V requirements. |
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Green power design to meet energy star and blue angel requirement
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A guaranteed maximum
power draw in standby, but these certifications do not address efficiency
at idle or load. |
| More than 75% efficiency
at typical load operation |
A conservative claim.
Most modern PSUs can do better than this, including Cooler Master's 450W
version. |
| Higher reliability (MTBF
> 400,000 hours) |
Eight times the EPS12V
recommended MTBF. |
| OVP / OCP / OTP / OLP
/ Short / Full protection |
All the usuals plus over
temperature protection. |
| Active power factor correction
(PF > 0.99) |
Required by EPS12V, but
uncommon on ATX12V power supplies. |
| Real power capacity
satisfy high-end system operation |
More than enough room
for any desktop system. |
The Real Power is aptly named: It is rated more realistically — make
that honestly — than most other power supplies on the market.
Both the peak and the continuous output capacities are specified. The majority
of power supplies list only their peak capacity, but cannot deliver their rated
capacity indefinitely.
The peak ratings of the Real Power are in line with the ratings of other power
supplies of this capacity: 30A apiece on the +3.3V and +5V rails and close to
20A on each of the +12V rails. In fact, the additional +12V3 rail puts the combined
+12V rating at a whopping (and completely unnecessary) 48A. If the Real Power
was rated in the way that most other power supplies are rated, it would be sold
as a 650W power supply. However, Cooler Master's decision to rate it properly
drops its capacity down to "only" 550W.
The more reasonable continuous ratings put the combined +12V amperage at 30A,
which is still a very hefty rating. It is almost impossible to think of a combination
of components that actually requires this amount of power.
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SPECIFICATIONS: Cooler Master Real Power 550 RS-550-ACLY
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AC Input
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90-264V @ 47-63 Hz
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DC Output
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+3.3V
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+5V
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+12V1
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+12V2
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+12V3
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-12V
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+5VSB
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Peak Output Current
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30A
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30A
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18A
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20A
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10A
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–
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2.5A
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Continuous Output Current
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20A
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25A |
12A
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12A
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6A
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1.0A
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2.0A
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Continuous Output Capacity
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191W
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360W
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12W
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10W
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550W
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Peak Output Capacity
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650W
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The trio of +12V rails are specified by the EPS12V form factor, and deserve
a little explanation for those who are only familiar with ATX12V. Like ATX12V,
the CPU is isolated from the rest of the system on its own +12V rail (+12V1).
In addition, the motherboard and workstation connector (+12V2) are separated
from the rest of the peripherals (+12V3), which usually means the drives. This
allows a large number of drives to be spun up simultaneously without starving
either the CPU(s) or a powerful video card for power.
It's not entirely clear how this three-rail EPS12V design is adapted to meet
the ATX12V specifications. Neither the 4-pin Auxiliary ATX connector nor the
PCIe connector are a part of EPS12V, so the specific rails for these connectors
are unknown. However, so long as these connectors are kept on separate rails
there should be no problems. The most logical and most likely configuration
would be to put the Auxiliary ATX connector on +12V1 and the PCIe connector
on +12V2. This would keep the two connectors isolated from each other while
still keeping the weaker +12V3 line free to power any drives.
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