I managed to get a system with 5x470 running oc on a 750w power supply, on -i 8. Its been running nonstop for 24h, so dont say that v9 has stability issues. If you know how to control the spikes, you will have a stable system, even on a low power psu like mine.
"If you know how to control the spikes" <-- Thank you for confirming exactly what everyone has been saying all along, there are power spikes.
If you read back, you'll see that it was I who discovered the spikes...
Back on track, it is not a miner issue that the power spikes, the software can only control hardware within hardware specs. Only software that has the ability to over/under clock and over/under volt can fuck with hardware, any other software without these functions won't be able to do anything.
If a regular software can push hardware beyond its limits, it is because of the manufacturer, he didn't properly test his equipment before releasing, and didn't foresee this kind of usage. So, now we shall know which PSU are really quality-built, also which video cards are quality-built (some spike more than others, even though they are the same brand and model; this might also have something to do with ASIC quality).