PC 2 threw a 'wobbly' yesterday. It has a clean, minimum win 10 pro on ssd, 2 x 1070 GTX non SLI, i7 4770K and was producing about 2.5 ppd keeping my room warm. Suddenly I'm down to 500,000 ppd with the GPU's at approx 20% utilisation each according to HWMonitor. Here's the curious thing: If I remove a slot, the remaining gpu goes back up to 100% and 1.25m ppd. Doesn't matter which card is working which suggests it's not a blown gpu. I don't have any cpu slots running. I've run sfc /scannow on the win installation - no issues. Nvidia driver 432.00 and FAH client control 7.6.21. Is it a psu issue? Any other possibilities? Thanks in advance PS it means Dave Goodchild is going to catch me even sooner!