My rig has i7-9700k, Aorus Z390 Pro, Corsair 16GB 3200mhz, Noctua D15, NZXT H700.
I followed the Gigabyte guide to 5GHz and here is what I got.
i7-9700k stable at @ 5GHz 1.31v with avx offset -3
On Prime95 with AVX I get 95c with no crashes
On prime without AVX I get max 87c with no crashes...