hi .one more last advice. just build a new rig with asrockz77 extreme4+core i5 3570k+8gbram+have 2 hard disk and gigabyte gtx660+ nzxt beta evo cabinet. now i have decided for corsair tx650 psu (i think it will be enough with overclocking if no then please suggest the right wattage) but the guy at store is offering me hx650 , the price difference is 15% so first of all is my wattage is correct or should go for higher wattage( i will overlock cpu+gpu but dont sli). and is hx series worth 15% premium over tx series. thanks
Yes it's enough the HX is better quality but TX is reliable so if you rather get the cheaper one nothing wrong with that bro it will work.