You just need to know what uF caps you will use... most common for output are solid caps 820uF 2.5v, for 12v from 1000-3300uF 16v electrolytic caps...
When you solder them on you have to be careful you don't solder em the wrong way round... watch for + and -
Actually reversing the "phase" of the cap can increase filtering or capacitance depending on how its put in-line with existing caps.
From what I remember:
Adding caps in series [alternating +/-] = increased power filtering potential
Adding caps in parallel [keeing +/- like-for-like] = increased current potential
**Various GPU's need combinations of both of the above.. some only one of the other .. mostly depending on the power phase design and cap choice/layout on the PCB.