You are in the same boat as meMy 9900k is stable at 5ghz 1.26v but can't do 5.1ghz @ 1.3v![]()

Here is also my Cinebench run with CPU at 5.0ghz, memory at 4000mhz and cache at 4.3ghz. Will be working on ocing the memory a little if possible and taking the cache up a little more if possible over next few days when i have time. Might also see if i can get a few cores to 5.1ghz at 1.3v. See if i can get over 2200 points.
Overall very happy with the chip, very quick.