I've had this happen back in on a modular 1100 watt psu on my 8800 Ultra.. The system was unstable at high graphics load, and it took me a long time to find the

I've had this happen back in on a modular 1100 watt psu on my 8800 Ultra.. The system was unstable at high graphics load, and it took me a long time to find the fault, the PCI-E power connector was high-resistance at the PSU end, the connector was totally melted when I found it, the instability was due to the gfx card browning out from insufficient power supply due to the high connector resistance.