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Old 06-09-2009, 10:06 AM   #1
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Default Akasa Paxpower 500 W Power Supply Review

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Title: Akasa Paxpower 500 W Power Supply Review
URL: http://www.hardwaresecrets.com/article/731

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"Paxpower 500 W (also known as Powerpax 500 W or AK-P050FG7) is a mainstream power supply from Akasa, featuring active PFC and a 120-mm fan. Since this was the first product we've reviewed from this br..."

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Old 06-09-2009, 09:03 PM   #2
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Quote:
Originally Posted by Gabe View Post
For our math we have to consider the part with the lower current limit, 20 A in our case. Applying the above formula gives us a maximum theoretical current of 29 A or 343 W for the +12 V output.
It's limited on the freewheeling diode. In this case, 30A/(1-0.3)=42.9A. The rectifying diode conduct current in 30% of the period so at 50A output (D=0.3) the average forward current of this component is 15A, still lower than its rated capacity.

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On the other hand, we could only extract 500 W from it after we removed the second ATX12V connector from the +12V2 input from our load tester. With both connectors installed there – i.e. using the EPS12V connector – the power supply wouldn’t turn on.
I've come across the same problem with a couple of multi-rail units. The problem is, if two connectors on different rails are connected to the same load, sometimes OCP is triggered far lower than its actual trip-point. I'll study this later.

Last edited by Travis; 06-09-2009 at 09:12 PM.
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Old 06-10-2009, 08:10 AM   #3
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Thanks Travis for your comments...
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Old 06-24-2009, 12:34 PM   #4
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The results from this review were updated today to reflect AC power and efficiency measured by our new precision power meter. Because of the new results we REMOVED the award we previously gave to this power supply and moved it to our "not recommended" category due to its low efficiency (it can only deliver above 80% efficiency if you pull between 200 W and 300 W).
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