I'm pretty satisfied with the testing, the Tuniq Potency 550 experienced a mere .08% voltage drop with a decent gaming card, less with a pair of mainstream cards in CrossFire. I'm sure that I would have experienced much more drop with a real power eater like a 9800GTX, but this isn't a power supply that I'd consider with an upper-end video card. 550 Watts in my opinion is nominal for a gaming rig, but it was more than sufficient with the test rig.

The Sunbeamtech Tuniq Potency 550 power supply should definitely be a consideration for a Phenom rig with a mainstream or lower sized gaming card. I didn't try it with my Intel rigs, mainly because they are set up with a little more stuff and larger video cards than I would feel comfortable with a 550 watt psu.

I found little not to like about the Potency 550. The heatsinks on the rails left a little to be desired, but seemed to have no affect on performance. Two 4-pin Molex connectors and two SATA connectors per cable may not be enough for some people.

I haven't yet mentioned the real magic of the Tuniq Potency 550. It runs $79.99 at my favorite online retailer. They even currently have a $25 MIR on it. Definitely worth a serious look for that budget rig.

The Sunbeamtech Tuniq Potency 550 power supply earns the OCIA.net Seal of Approval.

Pros:

Experienced a max of .08% voltage drop in testing.
80Plus Efficiency
Incredible price

Cons:

Heatsinks could be nicer, but didn't appear to affect the performance
Some may find a lack of Molex and SATA connectors