After a failed m/b and a bad summer I've decided to return to overclocking my r5 1600. I got my Vengeance B3200C16 RAM to 2933 and 14-14-14-15-35 and it was perfectly stable. I took the 1600 to 3.8 at 1.35v and it was perfectly stable. Getting cocky, today I upped that to 4.0 at the same voltage, expecting some instability that I'd have to fiddle with. What I got was no message to the screen. At all, not even to play with the UEFI settings. I've had to reset the CMOS, losing all my settings and I'm a bit bummed out. Not sure why I couldn't get anything at all at the moment. Is my power supply flaky? Shouldn't be, it was new this year - a EVGA NEX650G. It's not the graphics card - an MSI GTX 970 - as I checked with another card and had the same result, plus it worked perfectly before the cpu change and after the CMOS reset. Have I jsut lost the silicon lottery and the processor will not do anything at all at that speed? Can anyone give me any ideas?