Samsung DDR4 8Gb B-die timing guidelines for Ryzen (Patreon)

Viable for 3600-4000Mbps but skewed towards 3800Mbps with 1.4-1.65V depending on RAM chip quality. With GDM enabled. 

Note that most Ryzen 3000/5000 CPUs will not do more than 1900FCLK stable. 

Also Keep in mind that B-die is the least consistent DDR4 IC that I'm aware of. Unbinned/OEM B-die and low XMP spec B-die like 3200 16-18... can often struggle to scale to even 1.45V while being extremely temperature sensitive and doing horrific tCL tRCDRD and tRP. Like 3600 18-18-18 at 1.4V levels of horrific. On the flip side it is still B-die and so subtimings like tRFC can still go low.

tCL: 14-18 (can't be odd with GDM turned on)tRCDWR: 8-18 (8 works most of the time but this also doesn't affect performance much)tRCDRD: 13-18 (most good kits max out at 15)tRP: 11-18 (low tRP is more important than low tRAS)tRAS: 24-32 (just set it so that tRAS + tRP = tRC)

tRC: 38-50 (around 40 should work as long as your RAM doesn't suck)tRRD_S: 4 (it always does 4)tRRD_L: 4-6 (weaker dimms might need 6 to be stable)tFAW: 16 (this always works)tWTR_S: 3-5 (4 works most of the time. With a lot of voltage some sticks can do 3)tWTR_L: 7-10 (8 works most of the time. With a lot of voltage some sticks can do 7)tWR: 10-12 (I'd be very surprised if 10 doesn't work for you)tRFC: 220-330 (I usually just use 280)tCWL: equal to tCL or tCL-2 (no point pushing this lower as it will just raise your RDWR and WRRD timings if you do)tRTP: 6-12 (8 works on most good kits)

tRDRDSCL: 2-4 (2 works most of the time)tWRWRSCL: 2-4 (2 works most of the time)tRDWR: just leave this on autotWRRD: just leave this on auto tootRDRDSC: 1 (auto = 1)tRDRDSD: 4 (only applies to multi rank setups)tRDRDDD: 4 (only applies to multi rank setups)tWRWRSC: 1tWRWRSD: 6 (only applies to multi rank setups)tWRWRDD: 6  (only applies to multi rank setups)tCKE: 1 (ALWAYS WORKS)

If you're very lazy and your kit has a 3200 14-14 or better XMP I'd be very surprised if the following settings don't work for you. Also they aren't gonna be much slower than some hyper optimized 3800 C14 settings. 

FCLK: 1866MCLK: 3733VDIMM: 1.45 (I recommend a fan pointed at the RAM)VSOC: 1.1VGDM: Enabled

tCL: 16tRCDWR: 16tRCDRD: 16tRP: 16tRAS: 28

tRC: 44tRRD_S: 4tRRD_L: 6tFAW: 16tWTR_S: 4tWTR_L: 8tWR: 10tRFC: 300

tRDRDCL: 2tWRWRSCL: 2tCWL: 16tRTP: 8tRDWR: AUTOtWRRD: AUTOtRDRDSC: 1tRDRDSD: 4tRDRDDD: 4tWRWRSC: 1tWRWRSD: 6tWRWRDD: 6tCKE: 1this last set of timings is pretty much what I think a B-die "XMP" should/could look like if XMP was able to hold the all the settings.