Latest GPU drivers? Are you sure the PSU isn't faulty and not supplying enough power? ( i have no idea how to tell you how to diagnose a PSU). If you have the latest drivers and 100% sure the PSU isn't faulty, replace the card.
I thought it was a BIOS problem, so I installed the latest one just a few minutes ago. However, the problem still exists. I'm 100% sure that when i just use the computer without my graphics card, it runs smoothly. But when i plug in the card, the problem of freezing starts again. The Nvidia driver I have is 331.40 Beta driver, but even with the official 327.23, it same problem still persists.
My PSU is brand new, like a few weeks old, so I can't tell if its faulty.