Hello fellow overclockers. So, my 9900K has been working fine for over a year and is overclocked to 5Ghz Core and 4.7 Ring and it always boosted to the max overclocked speed as indicated in HWInfo under the core effective clock reading. I noticed recently when doing a few benchmarks with Cinebench that it now only get up to 4950mhz. I've tried to narrow it down to what could suddenly be affecting this, but I'm at a loss. I've literally stopped every piece of software and retested and intermittently it does start to function at 5Ghz at times.