I suffered for ages with a similar problem with a GTX280 OC.I had a 500 Watt power supply that I thought was good enough.
I had the card replaced because I thought it was faulty,closely followed by a new motherboard and various other bits but nothing cured it.
In the end I gave up and bought a new gaming rig. I gave my old PC to a friend who builds PC's.He immediately fitted a 700 Watt power supply and it's never missed a beat since.
The BFG GTX 280 OC I had was a power hungry beast,not sure if the 260 is as well.
This is what it consumes....
Quote:
- PC in Idle = 155 Watt
- PC 100% usage (wattage gaming Peak) = 365 Watt
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So you can see that a 500 watt PSU is going to struggle I think.