what more do i need to buy

[j and k]

i have a dual monitor setup of
two monitors acer 1366*768res
2gb zotak nvidia graphic card
8gb ram
1tb hdd
amd athlon 3.4ghz 2mb cashe processor
usb 3.0 card
two ups of power microteck 1kv twin guard beetel 700 saviour
and one of the monitor is powered by cpu via usb my system is restarting itself and videos are flickering in duplicate displays my smps is 450 watts zebronics 4 years old

 

[Icaraeus]

How often does it restart itself? If it's doing this continuously then you may have a problem with power supply.