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Samsung DDR4 8Gb B-die timing guidelines for Ryzen
🕑 Added 2022-08-10 06:33:52 +0000 UTCViable 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 auto
tWRRD: just leave this on auto too
tRDRDSC: 1 (auto = 1)
tRDRDSD: 4 (only applies to multi rank setups)
tRDRDDD: 4 (only applies to multi rank setups)
tWRWRSC: 1
tWRWRSD: 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: 1866
MCLK: 3733
VDIMM: 1.45 (I recommend a fan pointed at the RAM)
VSOC: 1.1V
GDM: Enabled
tCL: 16
tRCDWR: 16
tRCDRD: 16
tRP: 16
tRAS: 28
tRC: 44
tRRD_S: 4
tRRD_L: 6
tFAW: 16
tWTR_S: 4
tWTR_L: 8
tWR: 10
tRFC: 300
tRDRDCL: 2
tWRWRSCL: 2
tCWL: 16
tRTP: 8
tRDWR: AUTO
tWRRD: AUTO
tRDRDSC: 1
tRDRDSD: 4
tRDRDDD: 4
tWRWRSC: 1
tWRWRSD: 6
tWRWRDD: 6
tCKE: 1
this 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.
Comments
Actually Hardcore Overclocking (Buildzoid)
Eventually yes.
SAMW98SO
Anything like this for Intel?
Actually Hardcore Overclocking (Buildzoid)
the timings don't change between 2x16 and 4x8 on Ryzen. Just clocks and termination settings.
Evan Saltypaws
i'd be curious about 4x8GB but this is cool
