gpu usage problem with msi gtx 660 (non ti)

[msiuser]

I just bought this card about 2 weeks ago and it has this weard problem.
Some times the card stops working middle of game or just when using internet browser. its like 2 secs black screen and fps in game 100->15.
i have installed newest driver version and the problem just grew with it so im using the older version atm. i tried google and there was suggestions to update bios but im not really an expert with computers. Should i just return / change it to radeon?
gpu usage gets 99 and then the card crashes for a little while. i added auto fan speed so the card wont go over 50 degrees

Specs:
intel i5 2320 cpu 3.00GHz
6GB ram
Msi gtx 660 Twin Frozr III
pci-e 2.0 motherboard or what is it called
silverstone 600w

its factory made pc and it had gt 545 card before had no problem with that card

 

[msiuser]

k

yeah im using the older v.306 and it works better than the new update but it still crashes on some points.
Yeah im not pro with overclocking but i have turbo boost in cpu so it can go up to 3.30GHz

 

[msiuser]

if you mean power supply i have have 650w and this cards min requirement is 450w i bealive

 

[msiuser]

its silverstone 600w little mistake there
and model number: SST-ST60F-ES

 

[msiuser]

the card is factory overclocked so i cant change that and the card also crashes sometimes in like 30 degrees

 

[msiuser]

well im not good with this stuff and if you need to update bios you need to flash them?
my current bios version is 80.06.28.00.39

 

[msiuser]

well my motherboard is made by foxconn and model 2ABF
BIOS: Brand: AMI
Version 7.13
its market pc so.. i just upgraded from gt 545 and added more powerful power supply

 

[msiuser]

and when im trying to start flashing the bios, i cant open the file it just says this application cannot be started because it not compatible with 64 bit windows-version

 

[msiuser]

well i know that its not a pro or meant for gaming type motherboard because this pc witch i bought was 600 euros and that like average or below it on market pc's but they said in the store where i bought the new graphics card that if it has pci-e it will work just fine