UEFI 9920 / 1501 Essential Info

[gupsterg]

Some of the AMD CBS settings have been duplicated to Extreme Tweaker > DRAM Timings Control. This is a plus as when a Q-Code: F9 (ie memory training error) occurs and AMD CBS gets reset the values set on Extreme Tweaker are not.

Any value that is duplicated between other areas of UEFI and AMD CBS you only need to set in one place. The duplicated value even though does not reflect the change from another area and stays at [Auto], it will be overriden by the instance where value was set.

So as advised in first paragraph I would set in non AMD CBS locations. The other benefit of setting a parameter in a non AMD CBS section is they will then be in settings dump for UEFI.

Settings dump can be done via Tool Page > ASUS Overclocking Profile > Load/Save to USB > CTRL+F2.

One example is below:-

AMD CBS > UMC Common Options > DDR4 Common options > Fail_CNT

Is now named as Mem Over Clock Fail Count , Extreme Tweaker > DRAM Timings Control.

Another great addition to UEFI 9920 is The Stilt's Samsung B Die Timings.

These can be found in Extreme Tweaker > DRAM Timings Control > Memory Presets . The test kit used by The Stilt was F4-3600C15D-16GTZ RAM kit, so single rank, 1 dimm per channel. Owners with differing rank, dimms per channel and size may find they need to tweak the timings to use. The Stilt shared these on OCN, within the C6H OC thread, if members search for his posts there is further info on tweaks to the timings for other RAM IC, etc.

I would advise to set also:-

i) BankGroupSwap: Disabled
ii) BankGroupSwapAlt: Enabled

When using SR 1DPC RAM kit, as The Stilt has provided information on OCN that this is optimal setup.

The memory presets labels also state VDIMM that will be used. I knew from past testing my setup only needs 1.375V compared with 1.4V that preset has. So I manually adjusted VBOOT/VDIMM as required. I also had to change Memory Frequency [Auto] to DDR4-3333MHz.

I will add some more info as soon as I can. I have a thread on OCN which has some great pearls of wisdom from Elmor, Raja@ASUS and The Stilt, so would advise members to view. I do update OP as and when required and state any updates up top in OP.

Ryzen Timings Checker v1.01 by The Stilt, link 1, link 2.

[gupsterg]

Just wanted to share how I resolved gaining stability on 3.9GHz with 3466MHz as The Stilt memory preset.

UEFI 9920 and 1501 for my HW was exhibiting erratic failures on reruns in IBT AVX custom 13312 MB and Y-Cruncher stress testing. I tried a multitude of settings, but final resolution was to lower VDDP. I changed from [Auto] = ~975mV to 900mV manually set. This is the setting on Extreme Tweaker page within Tweakers Paradise.

Initial 10x IBT AVX custom 13312MB pass, link. Rerun of 5 loops, link. Y-Cruncher, link.

I believe VDDP stock should be 900mV. Why I state this is on 3x R7 1700 I have records of measuring ~900mV via DMM on stock setup prior to UEFI 9943. After UEFI 9943 [Auto] has become ~975mV. It seems my HW prefers lower VDDP than what [Auto] sets on newer UEFIs.

[gupsterg]

Just wanted to share how I resolved gaining stability on 3.9GHz with 3466MHz as The Stilt memory preset.

UEFI 9920 and 1501 for my HW was exhibiting erratic failures on reruns in IBT AVX custom 13312 MB and Y-Cruncher stress testing. I tried a multitude of settings, but final resolution was to lower VDDP. I changed from [Auto] = ~975mV to 900mV manually set.

Initial 10x IBT AVX custom 13312MB pass, link. Rerun of 5 loops pass, link, IBT AVX I use is linked in OP of Vishera owners club on OCN. Y-Cruncher 2hrs pass, link.

I believe VDDP stock should be 900mV. Why I state this is on 3x R7 1700 I have records of measuring ~900mV via DMM on stock setup prior to UEFI 9943. After UEFI 9943 [Auto] has become ~975mV. It seems my HW prefers lower VDDP than what [Auto] sets on newer UEFIs.