Hey ive got a dell precision T3400 with 375 watt of Dell power supply im looking to upgrade my power supply because i have a nvidia galaxy geforce GT 740 card and the minimum requirment of psu for it was 400 everything worked great before but then the sudden texture pop up increase and lag also in all my games ruined it for me so i was wondering if u guys could recommend me a good psu which can solve this problem and would fit in my cpu itll be really appreciated thanks