There are times when being a hardware reviewer offers some odd ways to enjoy yourself, such as the chance to pick up a brand new $800 GTX590 and try to make it explode.  That was how [H]ard|OCP spent a bit of time recently, fully investigating the claims that the NVIDIA Forceware 267.52 had faulty power management programming that would let the voltage on an overclocked card hit 1.2V or so and release the magic smoke from various parts of the graphics card.  Not only is this true, it is important because that driver version is on many retail disks, so those overclocking their cards with the disk provided by their manufacturer could end up with dead cards.  The good news is that you do not have to worry about that if you use up to date drivers and [H]ard|OCP shows in the review that there really is not much performance benefit to overvolting the GTX590 anyways.

Do GTX590s really explode? - General Tech 2 

"We take the new ASUS GeForce GTX 590 and overclock the crap out of it! What are all these exploding GTX 590 cards about? We will find out just what happens when you crank it up with proper power management working on the GTX 590. We compare performance at stock clocks, overclocked, and against a 6990."

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