Fairly sure it's not throttling. CBR 20 score is 5444 with security mitigations on.
Don't really know how long this CPU will last, but I've had it at 5GHz 1.224v manual override for 2 years and now 5.2GHz at 1.304v for 3 months after I went direct die. I use auto LLC with override voltage of 1.456v in BIOS, so it drops to 1.408v at idle and droops to 1.288v under maximum AVX load, 1.304v at max non-AVX load. I hope it lasts until the next CPU upgrade ;)
My issue with this board is that the VRM sensor would disappear after a while and hot reboots would shut down and I'd have to reset the CMOS on cold boots to get it to start. It's a faulty VRM controller sensor, but I can live with it for the great CPU and RAM overclock with such good VRM cooling, now that it's also out of warranty.