OFFICIAL 3900X and 3900XT Overclocking thread
I've searched and couldn't find a thread for 3900x owners to post JUST 3900x results. There is a one for 3950X and since 3900X is more popular why not to have a one too. So, here I start this thread and will post my results. Please, all users of 3900x's and future binned version - 3900XT post up your screens of OC's, cooler that you have used to do that and a batch number if you know(it is placed on ryzen's IHS).
So here's mine:
Cooler: Noctua D15, up to 75 *C in blender rendering in well ventilated case with many fans.
Batch: 2003 SUT
Voltage: 1.281V on LL3 dropping to 1.25V(SVI2 TFN) under full avx load
Infnity fabric max stable frequency: 1866MHz
CCX OC in bios:
CCX1 - 4450MHz
CCX2 - 4450MHz
CCX3 - 4250MHz
CCX4 - 4250MHz
aida ram latency 66.2 ns
Regarding batch number:
UA 2003 SUT
UA [YY][WW] 
YY -> Year
WW -> Week
1 -> ATMP Location ([P]enang, Malaysia or [S]uzhou, China)
2 -> Last letters of ATMP location.
3 -> Wafer Production ([S]aratoga or [T]exas)
Those from 2010 batch and newer tend to overclock better and on lower voltages since manufacturing proces matured from their debut.
AMD Ryzen 9 3900X @ CCX OC | Crosshair VII Hero, bios: 3103 | 2x16GB Crucial Ballistix Sport LT 3200CL16 Micron E-die @ 3733MHz 16-19-16-16-32-56 trfc 545 | RX 5700 XT @ 2038MHz on 1056mV with 15Gbps gddr6 | Samsung 970 Pro | Noctua D15 | XPG Core Reactor 750W