Games keep crashing but the PC doesn't, PSU issue?

First of all, my rig : Gigabyte GTX 670 @ 136x MHz core, i5-3570K @ 4.3 GHz, Asrock Z77 Pro3, Asus Xonar DX,Corsair Carbide 400R with the 3 stock fans, Cooler Master Hyper 412S with one fan, a few USB devices, Seagate Green 7200rpm HDD, Samsung 830 128GB SSD.
My PSU : Antec Earthwatts 500W 80+ Bronze
I experience very annoying PSU coil whine in all my games, but that's not my main issue. A lot of them crash after a few minutes or a few hours, even the ones that shouldn' t require that much power (Dirt 3...), but my PC doesn't, and I wonder if the issue is a lack of PSU power or not. I don't really have the money to get a new PSU right now and I can't RMA it anymore since I've bought it over 2 years ago.
Thanks for your help.
2 answers Last reply
More about games crashing doesn issue
  1. What video card were you using with your PSU before you got the 670, and did it crash on games with the other card?
  2. An HD 5850 with a Phenom II *4 965 BE without sound card nor SSD, I don't think the new rig uses a lot more power right? I think some games crashed too, but not as often.
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