Mushkin XP-650 power supply

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Aug 1, 2006 by Mike Chin with Devon Cooke

XP-650 Enhanced Power Supply
Mushkin, Inc.
Market: ~US$190
MRSP: US$229

Mushkin is not the first memory brand to introduce a power supply line in recent years. In the Power section of SPCR, there are several reviews of PSUs from OCZ, previously a memory and heatsink specialist, and in the lab today, we also have an early production sample power supply from Corsair awaiting our attention. For whatever reasons, the retail power supply sector continues to attract new players.

Most of these new players don't actually make the power supplies. The products are made for them by original equipment or original design manufacturers (OEM / ODM) — Fortron-Source, Seasonic and Topower being among the most active of these. This does not necessarily detract or add to the final product. With suitable engineering targets and good quality manufacturing, OEM/ODM products can be very usable for PC silencers. Take for example, the Silverstone ST30F, the Silentmaxx Fanless MX460-PFL01, the Nexus 4090, and the Zalman ZM460-APS: None were made by the branded company and we found all of them suitably quiet, efficient and stable enough to be worthy of recommendation.

The XP-650 is one of two power supply models offered by Mushkin. It is a dual 80mm fan model. The other model, HP-550, is slightly lower-powered and uses a 120mm fan.


If you like to judge a book by its cover, what about its sleeve? The retail power supply's equivalent of a book sleeve — where the cover art, exciting synopsis and complimentary review snippets are positioned — is its box. The Mushkin's retail box is subtle, classy, and clean. It speaks of class.

A substantial classy box.

The contents of the box are well packaged and protected, and immaculately presented.

The box contains the power supply, a user's manual, power cord, cable ties, and a box of output cables.


Feature Highlights of the Mushkin XP-650 (directly from Mushkin's web site and the manual)
FEATURE & BRIEF (quoted verbatim) OUR COMMENT
Advanced Thermal & Acoustic Design Automatically varies the PSU fan speed depending on the system load and temperature, allowing for the most stable and quiet computing environment no matter what programs are running.
Sounds good but thermal fan control is pretty standard these days.
QuadRail Provides four independent +12V rails for balanced power distribution If two is good then four is twice as good? But then the next feature suggests...
RailFusion Responds to increased loads by automatically combining the +12V rails, providing ample power for mulit-GPU systems... this feature combines the rails to avoid overcurrent shutdown. The green LED on the back of the unit will illuminate when RailFusion is active.
...maybe this is railconfusion? Is the green LED in lieu of overcurrent protection shutdown? It also exceeds the 240VA "safety" limit per line referred to by Intel in its ATX12V spec.
Power Conditioning Provides ultra-low ripple (1%) and superior voltage regulation (1%) under all load levels
This sounds good, but power conditioning seems like the wrong term for it.
VersaPlug Allows for an organized case and improves airflow by using only the required cables. Compatible with ATX, ATX12V, EPS, and BTX standards (20/24-pin ATX, 4/8-pin +12V). Includes two PCIe cables for multi-GPU systems and eight SATA power connectors.
Applies to most PSUs with detachable output cables.
Features NOT Highlighted by Mushkin but noted by us
Protections: Over Voltage Protection, Under Voltage Protection, Over Current Protection, Under Current Protection, Short Circuit Protection, Over Temperature Protection.
Very good.
EMI & Safety Approvals: EN, FCC, CISPR22, CE, T-V,UL, CSA, CB, NEMKO. SWEMKO, DEMKO, FIMKO The more the merrier.
Full rated power under 0-50°C temperature, 20%~80% humity ambient conditions. Very good.
Acoustic Details (from the manual): 22-24 dBA, 490~550rpm up to 60% load; 27-30 dBA, 1590-1830rpm under full load. Sounds good, but data about test conditions is incomplete: No measurement distance or ambient temperature given.
No PFC? Probably, or passive PFC at best. There is an AC line voltage switch. We'd expect Active PFC at this price.
Efficiency: >70%~73% at full load. Oooh, this looks like a throwback to 2002...

Compliance with....
ATX12V v2.2?

Compliance with these standards is not claimed, but there is a reference in the manual about the 4x12V connector being there for EPS12V, along with the 24-pin ATX plug for v2.2. An oddity is the -5V line, which disappeared from the ATX12V spec many versions ago.


AC Input
125VAC-10A-60Hz or -230VAC-5A-60Hz
DC Output
Maximum Output Current

Maximum Combined

528W (44A)

The individual 12V line ratings would add up to a whopping 80A, but the combined 12V spec says it's only good to 44A. Even if you had 170W power draw on the +5V and +3.3V lines (thought it's highly unlikely that any modern system would reach even half that power draw on those lines), there would still be 460W on the 12V line(s), which is quite a bit. With the so-called "RailFusion" feature, all of this power would be available to any component running of a 12V line.

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