Originally Posted by enthusiastdre
Ugh my brand-new 9900k needs 1.325V @ 4.9GHz (with -50% LLC on an EVGA Z370 Classified K + NZXT X62 280mm AIO) just to complete a single CB15 run. This isn't even CB20 or anything more intensive. It requires 1.4V to hit 5.0GHz.
I haven't read through all the thread pages here, but this has got to be one of the worst performing 9900k's out there. Of course, Newegg doesn't permit returns for opened items. Super disappointing, especially considering that a good portion of the previous posts on this thread seem be along the lines of "I needed 1.35V to hit 5.1GHz... terrible!"
Oh there have been worse chips. Seen some needing 1.35v load for 4.9 ghz (Load voltage/VR VOUT, not bios, so that's still worse than your chip as Z370 classified doesn't have die-sense, and I assume your 1.325v is bios set, -50% LLC is 0.8 mOhms of loadline, which makes it an 'average' 4.9 ghz sample according to silicon lottery binning statistics.
If you had been reading posts the last 6 months, the # of CPU's that could not reach 5 ghz on reasonable voltages skyrocketed after 9900KS binning happened, and even though that binning is now over, quality of 9900k samples in the wild is still hit and miss.
When 9900KS binning was alive and well, only about 23% of 9900k chips were hitting 5 ghz at reasonable voltages, so yes, you unfortunately lost the lottery
The only guaranteed way to get a good chip now is to buy someone's binned pre-tested chip (e.g. with temps, frequency, load "VR VOUT" or "die-sense" voltages shown during 5.0 and 5.1 ghz stress tests, HWinfo64 "WHEA" section shown, and with time/date stamps for validation). There should still be a decent number of people selling chips in classified or hardware swap, but you would have to ask for that binning verification.
But you would have a hell of a time selling a bad sample 9900k at this point in time.