Not the worst chip but i would say less than norm. Norm is most of them do 4.3/4.4ghz at 1.2v. Ures is similar to owikh cpu. But his eventhough 1.4v for 4.6ghz but does 3k rams easy. So maybe ure imc is stronger.
Ure ready to test that 4.2ghz with 2400mhz ram. Ure 4.3 and 4.4 is false. After we up the ram to 2400. Lets see ure 4.4ghz even passing Prime Test at 1.25v. I expect it to fail.

Set Ure timings to manually
Vcssa = 1.1v ( Offset +0.275v), Analogue i/o 1.2v ( Offset 0.200) , Digital i/o Auto (Shld be offset 0.100v on auto ..1.1v) & vdimm 1.65v , ( Later need to test this out also) Xtalk in tweakers paradise to 1.2v
Mem Tweak Auto
First Tier timings 10-12-12-31 Cmd 1T
Second Tier tRRD = 6 TWTR/TRTP = 9 tFAW = 26 TWCL = 7
Third Tier tRDRD = 4, tWRRD = 23 ( some rams can take it but need to test ures or leave it at auto)

Test with the 4.2ghz stable setting u have. U need now to run in the same condition but with Prime95
Set Prime as custom. Change Amount of mem to 7000mb/7500mb. Set ure Each fft from 15mins to 120mins.
We want to test the first FFT only as this is just to test the Mem timings and vdimm, vcssa and analogue/digital i/o.

If it passes an hour. Try using aisuite and reduce the vdimm to 1.625/vttdr 0.8125 and if it passes that also try reducing vdimm to 1.6v/vttdr 0.8v. If it passes that also awesome.

Then restart and reduce the analogue i/o to the point of booting and test again on prime. Then when u found ure best try reducing vcssa till u get full prime stability.

Last but not least.. Uncore Try 1:1 same voltage as vcore and keep reducing. The test suite for this is Linpack. Maintain the voltage and keep reducing ure uncore. Check linpack results.
U must get the same residual norm values. Also to make sure dont run anything else in the background and run linpack in high priorioty in task manager. Increase from 5 runs to 20.

When ure done with uncore try the prime test suite with above setting. If it passes

Run aida stability test cpu/fpu/system cache/system mem for an hour. If this passes the best way to test this is stable is..

Up ure cpu to 4.5ghz vcore 1.35v ( i am assuming ure cooling can handle this) with the exact difference u found previous on ure uncore to cpu to 1.35v. Run Initial at 1.75v and eventual at 1.75v vccin. Run the prime with the settings above for 2 hours. followed by aida few hours.

U got ure 4.5ghz now.

If ure rams can do 10-12-12 at 1.6v u may want to try 9-11-11-28@ 1.65v twcl value 6/7.
Another bit i forgot. Set ure tREF to 9360 adn tRFC try these values 74/90/106/122/138/154/170/186/202
tRFC generally if it can boot it will pass prime but u need to test it with prime with the setting above again.

Have fun.

Last but not least. RTL stability
Set inital RTL to +2/+3/+4 of the biggest value u see in ure RTIl a/B. Find the value till u can boot.
Then disable Swizzling bit 2 and set ure rtls and iol values. Set latency compensator enabled.

but really the last bit not necessary as the board is very consistent for 2400 on 2dimms.

I generally run CPU/Cache in manual and the rest in offset and full c-state c3,c6,c7s and pacakge state enabled. ( make sure ure cpu supports this)

u need to try prime on cold boot, etc. issues that arrise could be twcl or vccin etc.

Run memtest86 4.2 or the new 5.0 beta on cold boot. Try 5 passes min.