Is there a problem with the RM850 when used with R290X graphics cards?

I am having a problem with my new Radeon R290X graphics card - basically every game I run for more than 5mins gives a black screen and the GPU fan switches to full speed until I switch off the PC. Looking on Google there are several other people having this problem and they all seem to have one thing in common - they are all running RM750 and RM850 power supplies.



Is there any reason for this or is it just a coincidence? I have sent the R290X for replacement but they found no faults.