Yesterday I installed GTX 660 (replaced GT 220) and I tried my games without changing settings and FPS dropped drastically.
So is it PSU fault? Technically GTX 660 needs 450W as manufacturer states.
Or maybe it's CPU and MOBO incompatible/to weak for GPU?
P.S. I'm planning to buy MOBO - MSI H87 G41 PC Mate; CPU - i5 4440 to replace my current.
P.S.S. I have uninstalled my old video drivers through Display Driver uninstaller through safe mode and installed fresh ones.
V1 and V2 are artificial UL safety boundaries. But 18a. +18a does not necessarily indicate you have 36a, but likely less. Unfortunately your psu does not give any indication of what the total capacity might be.
The fact that the lesser voltages like +5v and +3.3v show high amperage values tells me that this is an older psu that does not deliver +12v amps where today's cpu and gpu units need it.
Can you borrow a good psu and test with it?
I would hate to tell you the psu is the cause when it really might not be.
Or, at least buy a unit from a place where a return will not cost you much.