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Support with 3900X Infinity Fabric 1800MHz OC issues

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post #1 of 51 (permalink) Old 08-27-2019, 12:37 AM - Thread Starter
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Support with 3900X Infinity Fabric 1800MHz OC issues

Set Up:

CPU: 3900X
Mobo: AsRock X570M Pro4 : BiOS v1.80
Memory: Team Group Dark Pro 3600 (4 x 8GB)

Hi all. I'm attempting a really basic OC (relatively). I was hoping for a Memory OC up to 3600Mhz, which I've managed both manually and using XMP, both via the BIOS, and a matching infinity fabric OC of 1800Mhz (with a DRAM voitage of 1.35V).

The problem is that I can't achieve a boot with a corresponding FCLK speed of 1800MHz. I have to limit to 1600MHz for a successful boot. I've attempted enabling the SOC/Uncore OC option and setting the SOC voltage to 1.1V (I think my mobo has this value at 1.2V by default as when I attempt to change it, its default is 1200), but this doesn't help.

To state. The memory overclock seems to take fine with all 4 DIMMS reporting 1800MHz (not tested extensively yet), but IF has to be clocked to 1600MHz.

Any recommendations to small tweaks to get a successful boot?

Edit: Spelling, OC Terminology, BIOS version

Last edited by Swissola; 08-27-2019 at 10:31 AM.
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post #2 of 51 (permalink) Old 08-27-2019, 04:06 AM
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I using 3466c16 corsair and oc to 3600c14 with 1.45v , my info:

Hope can help.
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post #3 of 51 (permalink) Old 08-27-2019, 04:30 AM
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Check the VDDG voltage. Raise it a little. 0.95v~1v should be plenty for that ifc.
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post #4 of 51 (permalink) Old 08-27-2019, 04:36 AM - Thread Starter
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Thanks for the reply

I was going to try and refrain from tweaking any timings until I had a successful boot MCLK:FCLK, 1:1, 3600:1800. This was to try and factor out as many variables as possible. Was going to try to keep my stock timings with the XMP 3600 profile working first then go from there.

What OC client are you using in your screentshot, is that with Ryzen Master? Would people recommend generally trying to OC using something like this instead and leaving the BIOS at stock?
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post #5 of 51 (permalink) Old 08-27-2019, 04:38 AM
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Only use ryzen master to check timings or change clock speed of the cpu + voltage o the cpu

Change ram timings/speed etc in the bios

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post #6 of 51 (permalink) Old 08-27-2019, 10:30 AM - Thread Starter
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I need to sit down and get some evidence and screenshots together, but I'm slightly out of ideas for the moment.

Tried to amend the VDDG as suggested. This value had a Manual entry and the value was 1100 already. Tried to set to Auto, save and restart cycle, and also change to 1150 (with save and restart). The values stay at Manual and 1100 through it all.

Same with manually trying to chang the SOC Voltage. Enabled the SOC Uncore OC option (as I'd read this was a pre-requisite to change the SOC Voltage). SOC Voltage is 1200 by default, attempted to amend to 1250 (as another detailed post has mentioned success with this)... Nothing. It doesn't take like the above VDDG, just set at 1200 when I save and return to BIOS.

Tried a bunch of other minor voltage tweaks, which did take after a save and reboot (will try to get this all down soon), but nothing past 1600 FCLK is possible, not even a 1633 FCLK bump.

I'm guessing a motherboard BIOS limitation at the moment as the voltages mentioned above seem to be immovable. Again, will reset my CMOS and have a wander through all the settings soonish... as I want to use my PC rather than just power cycle for an hour or two

Edit: Spelling

Last edited by Swissola; 08-27-2019 at 10:34 AM.
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post #7 of 51 (permalink) Old 08-27-2019, 03:03 PM
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Higher FCLK doesn't like high voltages. It will prevent you from posting or you will be getting lots of errors.

VDDG = 950mv ~usually~ safe and good enough. From there you can increase or lower to get ~stability~ for your particular goal. Adjust according to need and what it looks like to help.

Same with VSOC 1.100V should be all you want or need. It worked for me to 4266Mhz 4x8Gb ... or 2x8GB 4600Mhz... @ 1900FCLK

1.200V will prevent you from posting @ 1900FCLK.
1.150V returns errors even if it may post.

VDDP can be kinda anything I've seen but 900-950mv range is good enough for most to work. Same thing here to high can be bad and too low can work but you might get random reboots and whatnot.

Too high VDDG I've seen gives errors or outright will prevent you to post at higher speeds.

procODT is critical for any MEM OC. You need to get that right from the beginning you wan to reach the best speeds anyway in any manner of stability. Ryzen 3000 series have liked it around 40Ohm range thus far I've noted. Lower the better for higher speeds until it gives errors to be had. Too high procODT and you will not even post @ target speeds.

Gigabyte X570 AORUS XTREME, Ryzen 7 3800X 4.45Ghz, 4266/1900 MEM/FCLK, 16.26.19.48.76.tRFC 650 1T 1.58V
4x8Gb Kingston HX434C19FB2K2/16 3466C19 1.2V (Micron E-die 16nm)
OLD: Biostar x470GT8 Ryzen 7 1700 @ ~4.0Ghz CPU, 3200Mhz RAM ...
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post #8 of 51 (permalink) Old 08-27-2019, 11:05 PM
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Its different from chip to chip. Lower is not always better!

For 3800/1900 i need 1.15V SOC and 1.05VDDG to get it stable

Gameingcube
(18 items)
CPU
Ryzen 3900X
Motherboard
Aorus X570 Master
GPU
1080 TI Founders Edition
GPU
1080 TI Founders Edition
RAM
F4-3600C16Q-32GTZR
Hard Drive
2000GB Seagate Barracuda Compute ST2000DM008 256MB
Hard Drive
2000GB Seagate Barracuda Compute ST2000DM008 256MB
Hard Drive
samsung m2 970 evo
Power Supply
Leadex 80 Plus Platinum Netzteil, schwarz - 1200 Watt
Cooling
heatkiller IV pro
Cooling
EK-FC1080 GTX Ti - Nickel
Cooling
EK-FC1080 GTX Ti - Nickel
Cooling
Alphacool Eisbecher D5 250mm Plexi
Cooling
Alphacool NexXxoS XT45 Full Copper 480mm
Cooling
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Cooling
Scythe Grand Flex 4Pin PWM
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post #9 of 51 (permalink) Old 08-27-2019, 11:37 PM - Thread Starter
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This is all good information, and healthy overclocking debate!

Like I've posted previously, I don't have a lot of time for in depth tweaking during the week, but on first glance, I feel that what Nighthog says might be what's happening here. The stock voltages on my AsRock X570M Pro4 seem to be set especially high from what I've seen the default mV settings to be when I've tried to change them myself.

This coupled with the odd behaviour I've noticed in that changing and saving a single voltage alone, VDDG for example (as above) does not persist in the system after a save and reboot. The setting is as it was before the reboot cycle. This suggests that AsRock have gimped these values in the OC setting for whatever reason of their own, or I'm hitting a BIOS imposed upper Voltage ceiling.

I need to sit down and work through the AsRock UEFI BIOS methodically and record what I can seem to change and can't and try to work through all my observation to see if I can come to a conclusion how to reach the stable OC I'm after. Hopefully, with this forums help as well!
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post #10 of 51 (permalink) Old 08-28-2019, 10:25 AM - Thread Starter
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OK. On having a quick session when I got in I've now managed to boot with 3600MHz mem, 1800MHz FCLK, with my default RAM timings. The problem seems to be when I attempt to use my XMP timings and attempt a matched 3600MHz RAM OC and 1800MHz FCLK

Some other weirdness I've observed. After playing around with settings I found VDDG and VDDP seem to get locked to 1.1V if you choose a RAM speed of 3600MHz from the AMD Overclocking --> RAM Options. There doesn't seem to be a way of manually overriding these voltages at all (Unless I'm missing something?!)

There seems to be two places to set values as well. An OC Tweaker screen (which seems to be the only place to set DRAM voltage), and a menu option with AMD Overclocking (which seems to be a deep dive into the timings and most other settings).

I'll probably try with DRAM Memory Calculator over the weekend and go from there!

Attached is the OC Tweaker settings with my original stable XMP 3600/1600Mhz FCLK combo
Sorry, don't know the BBCode to embed attached images!
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File Type: bmp 190827172428.BMP (5.93 MB, 30 views)
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