Hmmm.... The PSU must be old... HD4670 is one the low power consum9ing card which just takes 8W when idle and around 50W on full load... But its not good to use it with a ald 250 W PSU... Better get a Cooler Master 390W@1.8K... Or i think the zebronics pro 350W@1.5K is also pretty much enough... Not sure about the reliabilty of cheaper brands like VIP...