Got a pre-binned Processor5 ghz chip from overclockersuk, can get a stable 4.8ghz MAX at 1.4v, cant get a stable 5ghz, tried 1.3 - 1.45v, the higher the voltage the more 'stable' it gets, but still bluescreens and crashes when stress testing, using cinebench,passmark,prime95, intel extreme, etc to run these tests btw. have spoken to overclockers on the phone and they keep recommending 1.375v but this is actually worse than when I'm tinkering. I've got a corsair h115i watercooler with x2 Noctua NF-A14 140mm industrialPPC-3000PWM Cooler fans, I've re-applied thermal grizzly paste multiple times, I'm seriously getting frustrated now spending £150 extra for a not guaranteed 5ghz chip. https://www.overclockers.co.uk/inte...a1151-pre-binned-processor-oem-cp-003-oe.html Recommended settings from product page via overclockers " Settings for 5.0GHz: - Vcore 1.32-1.39v load typically 1.35v needed at most. - VCCSA 1.05 for 3200mhz mems Upto 1.25 for DDR4000mhz + - VCCIO 1.0 for 3200mhz mems. upto 1.25 For DDR4000mhz + "