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post #1 of 11 (permalink) Old 10-20-2019, 01:15 AM - Thread Starter
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Safe Vddg voltage.

Hi guys. I am trying to get a 3900x to run at a fclock of 1900 but I am having trouble. I know that upping the vddg voltage is a key part to this but 950 is not working. How high can I take it without harming the cpu or other components.

Is there any other settings that can help. My soc is at 1.1v.

PS I know the ram is able to do this as I have another cpu that can run at 1900 with a vddg of 850. Unfortunately the processor itself does not boost high and does seem to have some issues with keeping its base clock at 3.8ghz under prime 95. Yes I am aware that it's a unrealistic stress test but at the same time there is a reason the term is base clock.

The new CPU can do 3733 I believe fine. How much is there to gain between that and a fclock of 3800? The latency of the ram is the same 14-15-15-14-32 just with 3800 requiring 1.5 volts.

Thanks
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post #2 of 11 (permalink) Old 10-20-2019, 02:31 AM
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Quote: Originally Posted by BMDJag View Post
Hi guys. I am trying to get a 3900x to run at a fclock of 1900 but I am having trouble. I know that upping the vddg voltage is a key part to this but 950 is not working. How high can I take it without harming the cpu or other components.

Is there any other settings that can help. My soc is at 1.1v.

PS I know the ram is able to do this as I have another cpu that can run at 1900 with a vddg of 850. Unfortunately the processor itself does not boost high and does seem to have some issues with keeping its base clock at 3.8ghz under prime 95. Yes I am aware that it's a unrealistic stress test but at the same time there is a reason the term is base clock.

The new CPU can do 3733 I believe fine. How much is there to gain between that and a fclock of 3800? The latency of the ram is the same 14-15-15-14-32 just with 3800 requiring 1.5 volts.

Thanks
In all honesty ever since I moved from a C7H mobo to the MSI Meg X570 Ace the only voltages I touched was cpu vcore and memory voltage and I was fine getting FCLK 1900 with memory 3800 without an issue. Testing with Karhu Memtest till 25000% was no problem. I did however notice that my VDDG when checking with Ryzen Master was sitting at 1.148v with SOC voltage stated at 1.1v but in Hwinfo64 the SOC is stated at 1.08v. Anyways, I've been running my system as such for the past couple of months without an issue.

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post #3 of 11 (permalink) Old 10-20-2019, 11:18 AM - Thread Starter
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Interesting, I guess I should swap the processors around again and see if the motherboard can figure out a good Vddg.

Any idea how much if a difference there is between 3800 and 3733 fclock if the latencies are the same? If the difference is small i may just keep the one that seems to clock better. Actually I guess I need to do some testing to see if the better clocks can overcome a slower fclock.

Thanks for the response.
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post #4 of 11 (permalink) Old 10-20-2019, 02:04 PM
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1.100V max. is AMD recommendation, unless SoC LN2 Mode is enabled (and the CPU is used in sub-zero temps).

0.950V is the default level and based on my experience, going over 1.000V is excessive as 0.950V should be more than enough for 1800MHz.
It is silly to brute-force anything by using the voltage, if there is no natural scaling. Especially when the difference between e.g. 1800MHz and 1900MHz is diminishing, and if there is > 150mV delta in the required
voltage between the two.

Also, to get 1.100V VDDG you need to ramp up the VDDCR_SoC (the source) to ~ 1.150V levels as well. Even at 1.100V SoC and 0.950V VDDG, were are already talking about ~28W typical "uncore" (SoC + ROC)
power draw for 2 CCD SKUs.
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post #5 of 11 (permalink) Old 10-21-2019, 03:16 PM - Thread Starter
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Quote: Originally Posted by The Stilt View Post
1.100V max. is AMD recommendation, unless SoC LN2 Mode is enabled (and the CPU is used in sub-zero temps).

0.950V is the default level and based on my experience, going over 1.000V is excessive as 0.950V should be more than enough for 1800MHz.
It is silly to brute-force anything by using the voltage, if there is no natural scaling. Especially when the difference between e.g. 1800MHz and 1900MHz is diminishing, and if there is > 150mV delta in the required
voltage between the two.

Also, to get 1.100V VDDG you need to ramp up the VDDCR_SoC (the source) to ~ 1.150V levels as well. Even at 1.100V SoC and 0.950V VDDG, were are already talking about ~28W typical "uncore" (SoC + ROC)
power draw for 2 CCD SKUs.
Thanks for the info. I will try to see if 1.1 vddg/1.15 soc will help my processor hut 1900 ifclk. With that said since this is the max is this the max that is safe to use for 24/7 operation or will this result in degeneration of the cpu if sustained for a long period of time?

Thanks again
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post #6 of 11 (permalink) Old 10-21-2019, 04:33 PM
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Quote: Originally Posted by BMDJag View Post
Thanks for the info. I will try to see if 1.1 vddg/1.15 soc will help my processor hut 1900 ifclk. With that said since this is the max is this the max that is safe to use for 24/7 operation or will this result in degeneration of the cpu if sustained for a long period of time?

Thanks again
Up to 1.200V should be fine, but the VDDCR_SoC voltage it requires can cause issues with PCIe Gen. 4 devices.
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post #7 of 11 (permalink) Old 10-21-2019, 08:49 PM - Thread Starter
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Quote: Originally Posted by The Stilt View Post
Quote: Originally Posted by BMDJag View Post
Thanks for the info. I will try to see if 1.1 vddg/1.15 soc will help my processor hut 1900 ifclk. With that said since this is the max is this the max that is safe to use for 24/7 operation or will this result in degeneration of the cpu if sustained for a long period of time?

Thanks again
Up to 1.200V should be fine, but the VDDCR_SoC voltage it requires can cause issues with PCIe Gen. 4 devices.
good to know. Hopefully I can get this processor to run at a fclock of 1900.

On that note my 32gb 3200 cl. 14 bdie kit is working at a timing 14-15-15-14-32 at 1.5 (a tad bit over as hwinfo shows 1.52 something) at 3800. From everything I have read this is fine for bdie.

Is that correct.
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post #8 of 11 (permalink) Old 10-21-2019, 08:55 PM - Thread Starter
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Oh and on the note about gen 4 falling off. I saw a YouTube video that stated that most motherboards lose gen 4 at 1.1v's but some how the Aorus x570 master is fine up to 1.2. is this also correct?
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post #9 of 11 (permalink) Old 10-21-2019, 10:36 PM
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Quote: Originally Posted by BMDJag View Post
good to know. Hopefully I can get this processor to run at a fclock of 1900.

On that note my 32gb 3200 cl. 14 bdie kit is working at a timing 14-15-15-14-32 at 1.5 (a tad bit over as hwinfo shows 1.52 something) at 3800. From everything I have read this is fine for bdie.

Is that correct.
And what latency do u get with these timings at 3733?

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post #10 of 11 (permalink) Old 10-22-2019, 10:17 AM - Thread Starter
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Quote: Originally Posted by rastaviper View Post
And what latency do u get with these timings at 3733?
At 3733 I run the same timings but at 1.47v instead of 1.5. I believe I tried 12-15-15-14-32, 14-14-15-14-32, 14-15-14-14-32, but I don't think they were stable. I do not recall if I upped the voltage. At that time I was a bit uneasy about going to 1.5v but I have been reading this should be fine.

I can try again tonight and let you know. Is there a timing you suggest I try? By the way gear down mode is on since this is a dual rank kit. I was not able to get it to post at all at 1t at the higher frequencies.
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