Output capacity vs max output capacity?

[Stas823]

Hello
Could someone explain to me the diffirence between the two, it seems fairly straight forward however as i found out this 650w unit
http://www.coolermaster.co.uk/product.php?product_id=6691 has max output of 780w however it is a 650w unit which seems pretty strange to me.

Thanks, also why is there no power supply sub forum (its probably the most said thing when it comes to PC failures).

 

[Stas823]

I find it interesting that they didnt market it at 750w as by the looks of it, it can produce, and dont a lot of PSU sellers rate their supplies at the max output?

 

[Stas823]

It's rated at the output of the 12v rail at that's where most power is drawn.

Thanks, shouldnt they rate it as a whole unit rather than a single 12v rail?