Well ive started using risers in 2013 and if they are broken or dead just swap them thats all its like only 4$ in 6-12 Months. My Rig run also efficient 180 Mhs at 690 Watt fans goes on only if it reaches 50°C and runs for some seconds. I had close builds and it was suck it was very hot and very very loud you cant have it at home.. In sommer cooling system at 100% all the time and you also need to downgrade them because of overheat and -10 Mhs pro rigs kind of lot of moneys and they still runing at 75°C. Risers from 008C version are good they got 25V capacitors and can hold Vega64 easy without spikes. Well, its only my expierence.