I have OEM system from fujitsu (i3-2120 , 7.2k hdd , 4x2gb ddr3 , 250 watt PSU) which i want to upgrade with 1050 2gb. I am scared of my psu.Psu is 250w from fujitsu 18pin connector. I calculate psu volatge which i need and that was about 240 watt . Will my pc handle 1050? please help!