Seems the PSU is the cause to my computer switch off, after reading this review:
"This PSU advertises 650watts with 36amps down the 12v rail.
In this case there are 2 x 12v rails each one "apparently" delivering 18amps each.
Having installed this PSU in my own machine, i soon found that the computer instantly powered off as soon as any stress was put on it ( ie: by starting a game with the video card pulling power ).
Upon further inspection with a voltmeter i found that not only was this so called 650w PSU not delivering the promised 36 amps, but each rail was delivering a staggering 11 amps each.... for a total of 22amps.
This is incredibly weak for a 650w PSU and is the kind of output i would expect from a good 300w supply.
In short, if you require a PSU for any kind of gaming at all, this is NOT the PSU you want and is a waste of money.
A good quality 550w will produce 40+ amps and would be a much better idea.
NOT worth it!"
Could some please say what PSU wattage i need minimum for my rig as i want to spend the least but get the best.
MSI GTX n760
FX-8320
Gigabyte AMD 78LMT-USB3 (on its way)