Andrew
Posts: 1986
Joined: 2/4/2003
From: Murray, KY,
Status: online
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I think I would go with this SPARKLE, also from NewEgg.
Power supply ratings represent the total maximum output for all voltages. However, many manufacturers fail to point out that while the 3.3v rail and 5v rail may have a substantial current rating, the combined output will be much less. If you check the ratings label on the Eagle Tech supply, it lists the 3.3v@30A and 5v@35 -- theoretically 274 watts. But when both rails have a load, the maximum combined output is 170 watts. Total combined output on the 3.3v, 5v, 12v1 and 12v2 rails is 370 watts.
It is true that the more highly rated PS's can produce more current at each voltage, but total wattage may not always be the best measure. Secondly, I must confess that I'm skeptical of any manufacturer that claims a 500 watt rating for a $20 PS. I once bought a 450W supply for $14 just to see how it matched up with other supplies. The INTEL Design Guide recommends 18 AWG for the primary power rails -- this particular supply used 22 AWG throughout.
I have used a lot of Sparkle supplies in my work with good results. The supply I've linked is a 350W ATX 12v, ie. a single 12v rail rated at 16A. The Eagle Tech is an ATX 12v2 -- 2 12v rails with different current ratings, both less than the Sparkle. Although $5.00 more for fewer watts, I think Sparkle tends to be a little more realistic in how their supplies are rated.
However, YMMV
andrew
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the "other" andrew
I'm not older than dirt, but I can remember when it was patent pending
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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> Is this PC power supply OK. Pictures 
Is this PC power supply OK. Pictures - 
You can probably expect to get 10 to 12A continuous at around 12.1 or 12.2 v. I caution folks to remember that these PSU's are being used well outside their design environments and the performance is not always predictable, expecially WRT the sensitivity of the overload circuitry. High current demands that trip some supplies will not bother others -- I think this supply will manage most charging needs, but until the rubber meets the road, you cannot always predict how well it will work.