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I sit here quite hours and looking for differences for my old Seasonic SS330-GB and look the pictures for a SS380 and a Corsair VX450W. But the only differenz i can find is the capacitor, that seem to be more bigger in the VX450.
So here is the idea, replace the org. capacitor ( org. 180µF ) to a bigger one 250-280 for example and get more output Power on all rails?

That's a very bad idea. Never open a PSU. You could be killed by messing with what's in there. Modding a PSU is also an incredibly bad idea. You are more likely to burn out your whole system than get some performance increase.

After a few hours being disconnected a PSU should be fully discharged. Safe to poke around and have fun with, they are interesting little creatures, but I'd never electrically MOD one.

I know i still dont get more mh/s with tuning that thing.  ;D
Not every thing belongs to performance, i'm looking to improve my old but good 80+ atx2.2 psu.
Replacing a capacitor is not that heavy thing, just want to know does it belongs to the size of the capacitor?

If you cannot read and explain the schematic diagram of the device you are modifying you are just guessing. Why would increasing the capacitance of the component in question change anything?

A bigger cap is most likely not going to net you more capacity. The power output capacity on a modern day SMPS is limited by the MOSFETs.

http://666kb.com/i/c3k1bq28bz7sevt30.jpghttp://666kb.com/i/c3k1cbc70yln9vf24.jpg
So here is the competition. I count same numbers of mosfet. Can be there a little more bigger than my psu (under).
But here you see clearly the much more bigger capacitor.

The capacitors have no bearing on output power or capacity if the rest of the components are the same. FWIW, the smaller one appears to be a 180μF cap. I can't tell for sure, but it looks like it is rated for 400 volts, which would mean that it is likely used in the secondary stage of the PSU, not the output stage. (Could be wrong about that.) Although the number of MOSFETs may be the same, it is possible to get different ratings in the same package size.

mosfets are silicon devices.

It is like looking at a Pentium II and a Core i-7 saying they look the same thus must have roughly the same amount of performance.

How can you tell if the PCB is identical without a schematic?
Looking at the 2 pics the two PCB's are dissimilar. In both pics, compare the printing on the left side just above the Caps you want to change. One says 10/15x5 while the other states blah/25x4. I haven't seen the specs for your PSU's but this may indicate # of rails and the amperage available to each rail.

I just don't think it is worth the man hours of staring at it trying to find a difference and possibly replacing one part that may or may not do anything.

If you need more power then get a bigger PSU.  I never get too attached to my hardware, there is always something better out there. ;D

I also imagine the control circuitry would need to replaced. Even if it were possible, I cant imagine it being worth he hassle and risk.

The two pcb are identic.  ;)
But i say allready, the mosfet on the Corsair seem to be bigger.
But at all, i find out that my soldering iron is broken.  :'(

...luckily for you since you really shouldn't mess with that PSU of yours.

It's mostly the bridge rectifiers and power mosfets one needs to worry about in a PSU.
You won't find any obvious differences between these because they come in industry standard packages (e.g. TO-220 (http://en.wikipedia.org/wiki/TO-220)).
You need to study the datasheets to learn the exact specifications.
The fact that you're not even aware of this is proof positive that you shouldn't think of tampering with the PSU.

BTW, capacitors are merely used for filtering and ripple suppression.
Replacing that "grain silo" will not increase the output power.

thx.