not all 500watt psus are the same. It all depends on the amps on the rails. I don't know what the requirements are for the gtx260, but it should be on the nvidia web site.
the gtx 260 requires 36A on the rails but my psu is rated at 18A and 16A and thats with one of the power connectors using the molex adapter and its running my Core 216 just fine. nothing is running hot or freezing up. i dont smell anything but get a good brand like rosewill or corsair ect.
You are about to answer a thread that has been inactive for more than 6 months. If you still wish to proceed, please ensure that your posting is original and does not duplicate or overlap any prior responses to this thread.