There's no way 1.33v under load degraded his chip unless he decided to run insane current through it for hours on end, like P95 24/7 with the chip screaming at 95c. It was always an unstable OC, it just decided to rear it's head now.
I had this issue on a Maximus XI Hero w/ my 9900K that started crashing out of no where on settings that worked for over 3 months. It was realbench 12hr stable, CB20/15 20passes stable, etc. This was on only 1.19v under load @ 5Ghz/4.7Ghz cache. Sometimes it happens. I had a Mem OC that was 750% HCI Memtest stable that ended up corrupting an entire windows after a few weeks. No way of knowing because every single app ran perfectly. I'm not sure if this is really a thing, but I'm starting to believe that when the hardware is new, it's less sensitive. Once things settle in, suddenly it's not enough. I would love to hear from someone like Buildzoid on whether this is a thing.
Right now, I'm running 1.255v under load for 5Ghz/4.7Ghz cache, which is much more realistic. 1.19v @ 5Ghz was unbelievable and golden chip levels of voltage, but for 3 months it was perfectly stable with, as I said, 12hr realbench and CB20/15 20 consecutive passes each, along with hours upon hours of gaming across various engines.
I'd suggest clearing CMOS, inputting the 4.9 settings, and let it run for a week. If no crashing, start trying to tweak 5Ghz again. Find what the new settings are - I wouldn't be surprised if it's a small voltage bump.
Last edited by acoustic; 02-09-2020 at 05:59 AM.