I bought some PCIe x16 Extender Cables, initially just to improve my cooling situation and then later perhaps to add a fourth card to my Intel based ASUS P6X58D-E motherboard. I spent hours building an aluminum frame and finally setup everything. I tried several times to get the system working but it was unstable. It would run for a couple minutes then hang, even before starting any poclbm processes. None of the PCIe cables were touching each other.

I put everything back the way it was (without the cables) and everything was back to normal. I do overclock my cards, but don't overvolt them. I did not try to lower the clock speeds because that would defeat the purpose. I'm writing this not to complain, the cables were top quality as far as I could tell, but to warn others that it's not a "slam dunk". You may run into issues like I did.

I have a second miner with AMD 890FXA-GD70 motherboard where the cards have a comfortable spacing (air gap) already, without the need for cables.

Is there anything I should have tried before I gave up?