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How do I know if the voltage has been changed?

Hey guys,

I just saw an AD on craigslist for an GTX 590, seems to be in good condition and everything.

But I read in another website that if you change the voltage of the card, you void the warranty.
How can I check (before buying) if the voltage on the card has been changed before?

And also, what are good stress tests for the card? Nothing overnight please, just a 10~15 min thing that I can check if it's working 100% as it should!

Thank you!!
2 answers Last reply Best Answer
More about voltage changed
  1. Best answer
    With this you can test the gpu. http://www.ozone3d.net/benchmarks/fur/ download, instal and run.
    With this you can see voltage, temperature and almost everything about your video card http://www.techpowerup.com/gpuz/
  2. Best answer selected by tutstuts.
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