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

Test Rig:

Intel Q6600 Core 2 Quad @ 3.2gHz
Asus P5K Deluxe Wifi-AP
Buffalo Firestix PC2-8000 2 gig kit
Zotec geForce 8600GTS
OCZ Vendetta CPU cooler
Zalman VF-1000 GPU cooler
SilverStone KL-01 case

As with all PSUs, mount the power supply and plug everything in. Though there is some flex between the connector and filter on the PCI-E cables, you may have a little trouble plugging in a particularly long video card. All of the connectors felt good while connecting, I particularly liked the SATA connector. Sometimes you wonder if they are plugged in well, but this one had a really nice feel.

Plug the power cord into the PSU, switch the I/O switch on, and power up the rig.

During my testing, I checked voltages on both the +5v and +12v. I ran a multitude of applications to have as much of the hardware in my rig running at one time and ran ATITool to crank up my video card in 3D. The +5v remained at 4.8v the entire time but the +12v gave me a little concern.

At idle, the Shark was at 11.91v, which is within but near the limits of the 10% allowed variance in the PC PSU industry. But during my testing, no matter what I threw at it, the Shark maintained the 11.91v. Not having an SLI rig available, I wasn't able to check the performance using a second video card.

During the entire testing, the fans ran at slow speed, and the PSU was pretty much silent. A couple of hours later, while I had only small applications open, I noticed my rig had gotten a little louder. The Shark had gotten warm enough for the fans to spin up. It wasn't terribly loud, but enough for me to notice with my otherwise silent rig. They slowed down after maybe 10 minutes, but not quite to silent running.

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