Sigma Shark SP-635 635 Watt Power Supply
Author: Frank Stroupe
Editor: Shawn Knight
Date: 12-14-2007
Provided by: Sigma Products

When someone makes a forum signature block with their rig's specs in it, or tells their rig's specs in a post, they usually leave out the PSU. Those of us that help people troubleshoot their PC problems often have to beg to find out what brand of power supply someone has to help try to figure out what is wrong. And very often, their problem is a marginal or too small power supply, because far too often, that is where corners are cut.

I mean, what is a power supply? A rectangular box with electrical stuff in it and wires coming from it (I do understand what the stuff inside does, but I know that most don't). The box may be steel or aluminum; painted, plated, or anodized. The wires may be sleeved or not, modular or not. There will be a fan or two, they may have LEDs, or not.

I guess that's why I found it rather refreshing to review the Sigma Shark. No, it isn't some kind of radical departure from the basic power supply, but it is a little different.

The Shark comes in this box, that at first glance is not impressive, until you look at it for a minute, and realize that the graphics are pretty cool, a photo of the bottom of the PSU.

There are two models of the Shark, the SP-585 and this one, the SP-635. The differences between the two are 50 watts, and the SP-585 is silver. This one is black anodized.


Type: ATX12V
Maximum Power: 635W
Fans: 2 x 80mm Blue LED fans
Main Connector: 20+4Pin
+12V Rails: 2
PCI-E Connectors: 2 x 6Pin
NVIDIA SLI Support: Yes
Modular Cabling Support: No
Efficiency: Up to 80%
Over Voltage Protection: Yes
Input Voltage: 100 - 240 V
Input Frequency Range: 50/60 Hz
Input Current: 10A
Output : +3.3V@30A,+5V@38A,+12V1@20A,+12V2@20A,-12V@0.5A, +5VSB@2.5A
MTBF: >80,000 Hours
Approvals: UL, CUL, FCC, TUV, CE, C-tick, CCC, CB


Connectors: 1 x Main connector (20+4Pin)
1 x 12V(4/8Pin)
8 x peripheral
4 x SATA
2 x Floppy
2 x PCI-E (6-pin)
Dual 12V output circuits provide added system stability
Dual 80mm silent blue led fan
Durable ALUMINUM chassis
High grade black mesh wrapped cabling

The 635 watt Shark isn't SLI certified by nVidia, but it is set up with a pair of 6-pin PCI-E connectors, and having a pair of +12v rails at 20A each exceeds nVidia's requirements for a “High End SLI PC Configuration”. There are none of the new 8-pin PCI-E connectors on the Shark, so keep that in mind if your rig requires them.

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