Nice thread, but you should have reserve few upper post. Your guides all sprawling between some.

Tell mods to clean up the thread.... 

cheh...maybe u shouldn't write comment & advise are welcome lo.Simply wan to delete post    

1st time doing this thread ma....     

7. The efficiency
...
Efficiency is a measure of how much of the power a PSU draws from the wall actually reaches the computer. Thus if a PSU is 80% efficient, and is drawing 375W from the wall, only 300W will reach the computer, and the rest will be given off as heat.

the above part, it's actually the other way around. it's not wrong at all because it really is about % of power draw reaching the computer.

i would have put it .....

If a computer drains 400w, then an 80% efficiency PSU would theoretically draw 500w from the wall.

because it's from the components, telling the PSU what they need, and the PSU then draw from the wall.

anyway, nice thread pinned.

...from the wall.be given off as heat.

UPDATE for your FIRST POST

#1 - TX650 V2 Outdated. Now it's called TX650M. Previous batch of TX650M was still made by Seasonic. Now they are no longer Seasonic OEM but AFAIK according to my pro-PSU partner. Basically just change everything V2 to M.

#2 - When calculating for power draw, please allocate more headroom that you need. Leave about 30-40% headroom (so that the PSU runs at about 50-60% load). Usually PSU can only achieve higher efficiency rating at over 50% load (if not mistaken). This also keep the PSU temperature down and keep everything in its IDEAL performance.

1. Really? Wasn't that M=made by CWT, v2=made by Seasonic meh? 
2. Noted.  Thanks. 

I believe M was still made by Seasonic until recently. The M packaging and some internal stuff seems to have changed. But hey, the M now shuts off its fan under light load, did not notice until today where we tried the PSU on a bench table with the fan facing upwards

Efficiency:
I see something missing here.

You're right.... It seems like the v2 has been discontinued... But it seems like it's made by CWT...
There are a lot of TX M series...   There's actually another variant of the TX M, made by HiPro, without 80+ certification.

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Added on December 10, 2012, 11:19 pm
Already fixed that part. 

Understanding multi-rail power supplies' 12V rail's maximum power capacity:

For multi-rail power supplies, the ampere stated for each 12V rail is their maximum current capacity, unless the stated ampere rating is not its maximum current threshold. For example, if each 12V rail in a multi-rail power supply has a rating of 16A, it means the maximum power it will be able to carry would be 192W ( again, considering if the stated ampere rating is the maximum for the rail ). It does not mean that the rail will supply up to 192W . If a multi-rail's power supply's 12V line has only 500W to spare to all the 12V rails connected to it, then they will have to ration the given power. The same applies for the 3.3V and the 5V line.

I believe that "lost as heat" would be a better term.

Anyway, I find that the explanation on the 12V rail maximum power supply part is rather indirect. It would probably be much nicer this way :
Anyway, you may also want to label the single rails and multi-rail power supplies properly as you just jumped into telling people how to read the current reading of this 12V rail and that 12V rail.

I own a Huntkey APFC 7000(RM225), brought it 2 years ago, I remember Huntkey PSU was hot selling product at Garage Sales. Now people try to avoid this bad due to high failure rate according to reviews.

I need some sellers here to clarify, does this brand really that bad ?