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Hello, all. I have a 4x8GB B-die kit with A2 PCBs. I can reliably post at 3800C14, but I'm having trouble stabilizing the configuration. I have spent quite a bit of time working on it. I can pass 3 cycle of TM5, but it errors out after that. I believe my timing relationships may be off, or I have some more adjustment to do on RTT. Can anyone assist?




SOC Voltage: 1.075V
VDDG_CCD: 1.0V
VDDG_IOD: 1.025V
CLDO_VDDP: 0.9V
VDIMM: 1.525V
RTT_Nom: 7
RTT_Wr: 3
RTT_Park: 1
CAD: 20/20/20/20
ODT: 28 ohm


Utilizing the attached timings.
 

Attachments

tRP 12,
tWR 12,
tRCDRD 15,
tRDWR 8,
tWRRD 1

Also a bit more information about your PC would help a lot.

Apologies. I thought the advice would be relatively generic. It's a 3900X with an Asus CH8H. I've customized the Digi+ menu already to improve VRM performance. I have active airflow on the DIMMs. Please let me know what other specs you'd like to see.


EDIT: tRP 12 is a definite no-go. Full of immediate errors when starting a memory tester. Seems to be working a bit better with the attached timings, but still too early to tell.


EDIT 2: The below timings pass 10 cycles of TM5 for me. I'd really like to find a way to bring the Vdimm down closer to 1.48V. I wonder if this is even possible. This is 925 CLDO_VDDP, 1540 Vdimm, 1075 Vsoc, 1025 Vddg_iod, 950 vddg_soc.
 

Attachments

Hello, everyone. I am continuing to work on my memory OC. Quick catchup:



  1. I have 4X sticks of single-rank Teamgroup 3200C14 B-die.
  2. The PCBs on all DIMMs are A2.
  3. I have an Asus Crosshair VIII Hero and a Ryzen 9 3900X.
  4. I have active cooling on the DIMMs (120mm Noctua fan)
  5. I'm currently getting 63.3 to 63.5ns with these timings @ 1900 fclk/mclk.
  6. I'm 25,000% Karhu stable/25 cycles TM5 stable.
  7. Voltages are: 1.48V DIMM, 1.1V SOC, 1.05V VDDG, 0.95V VDDP.
  8. RTT is: 7/3/1
  9. CAD is: 24/20/24/24
  10. ODT is: 34.3 ohms


63.3ns is not too bad, actually. It's quite good. But I'd be thrilled to shave off another 1-2ns. Is there anything I can try?
 
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