7770

my sapphire hd 7770 hangs sometimes while playing games....i had purchased it in april,13 is it under warranty? whom to contact for rma? is there any chance of getting better replacement gpu than 7770?

Hi guys, thinking of this upgrades to my PC. Sapphire HD 7770 1 ghz GDDR5 Seagate Barracuda 1 TB Internal HDD Choosing PSU as, Coolmaster Thunder 450 W. My question is, can this PSU handle those GPU and HDD..? Am now running on AMD Athlon X4 645 3.10 GHZ, 4 GB ddr3 memory, Asus M4A88T-M LE...

My system specs are as follows: CPU : Intel Core i5 760 GPU ( Current ) : NVIDIA GeForce 8600 GT GPU ( Until very recently) : HD 5670 PSU : Zebronics 500W (I can post a picture of the side of the PSU if needed) Motherboard : intel DH55TC RAM : 4Gb DDR3 OS : Windows 8 Pro...