I have a P8Z77-V Deluxe with a 2550K that has been running happily at 4.8Mhz for months. Unfortunately I "twiddled" a few setting in my UEFI based on reading the Asus ROG Overclocking Guide. Now it won't run over 47 even if I set the ratio to 48 or 49. Has anybody else experienced this ratio limit? It runs under load with this limitation but won't clock up under load.
I looked for a thread but came up with no answers.
Any help would be appreciated. I am more interested in knowing why this is happening than getting a couple more Mhz.