I tried setting 1 core clock to 5.3ghz but in single core uses (monitored with task manager) it keeps the all-core speed of 5.2ghz.
running bios 1.03
Edit:
-probably should note I tried in the bios and in the Eleet software.
9900k @ 5.4 Core 5.0 Cache @1.44v 1.34 VCCSA, 1.35 VCCIO
2x8gb @ 4667 CL 16-17-17-32-2 @1.6v
2080ti @ 2205 Core 8000 Mem