That looks to me like another Fortron, but actually not a bad deal, assumin those specs are real. Personally, I'd risk it for that one.
So you don't get the specs? OK, here goes, real simple (my father was an elctrician for many years, so I can't say tha has nothing to do wit it
):
Your components use three voltags, +12v, +5v and +3.3v. The -12v and -5v lines are being phased out, as nothing has used the in the last decade or so. Most PSUs piggy-back the voltages, so you go from the 12 to 5 to 3.3.
Due to this, when the 5v line pulls too much the 3.3v line suffers, and vice versa.
A good 300w PSU will ave at least 23A on the 3.3, 20A on the 5v line. Good ones more. The 12v is what increase the most in higher-wattage supplies, as drives tend to hog that pretty good.
On a side note, Antec's TruePower supplies don't do this mess, and have dedicated rails, so as long as the toal pull of all three don't add up to more than its rating, it is fine.
The big thing here is that you will often find cheap suplies rated very high, but with actual, or near-actual specs of a 300w PSU, but it can pull 500w for 1 second, so is rated as such. Good brands, like Fortron, Sparkle, Enhance, etc. rate their PSUs somewhat conservatively. Enermax PSUs and Antec's TruePower tend to be rated at their nominal outputs. Crappy brands rate them much higher.
Think of it lik a horsepower vs. foot-pounds thing. You can get a 200 horsepower engine no sweat, but the torque will tell more of the real story.
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