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Discussion Starter #1
Hi,

I'm running a 9900KS on a Gigabyte Designare with G-SKill Trident Z CL14 3200 MHz.

I'm wondering what a safe lower voltage would be for VCCIO and VCCSA without having to test it for a few weeks but lower than the standard of 1.3 and 1.2 volts.
 

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@Canson
Does anything over the spec'd memory speed for Coffee Lake require more VCCSA and VCCIO than stock?
Not necessarily , just don't use the auto settings. Motherboard vendors put crazy high volts in auto settings , which will decrease the cpu lifespan. If you have b-die memory that run higher than 4000mhz then you might need some like 1.15-1.25v for VCCSA and VCCIO which should be enough.

Don't exceed 1.35v for both for daily. You only that high voltage if you overclocking your memory with tight timings.

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Hi,

I'm running a 9900KS on a Gigabyte Designare with G-SKill Trident Z CL14 3200 MHz.

I'm wondering what a safe lower voltage would be for VCCIO and VCCSA without having to test it for a few weeks but lower than the standard of 1.3 and 1.2 volts.
Stock is 0.95v for VCCIO and 1.05v for VCCSA, for JEDEC, but in most cases, this works for 3200 mhz XMP as long as you aren't trying to tighten any subs. In some rare cases you may need 1.10v VCCIO and 1.15v VCCSA to prevent Prime 95 (version 30 or newerE) 112k-112k fixed FFT, AVX disabled errors and "CPU Cache L0 errors", when overclocking, but that really should not be necessary.
 

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I am using 1.3 for both voltages for on a 10700k. I don't know how much more voltage tolerant the IMC is on a 10700k vs. a 9900k, but I can't imagine it is all that different.

The suggestion to NOT leave them on auto is a solid recommendation. My board will overvolt the heck out of them if left auto while overclocking.

Edit:. These voltages are for 4300C16. I can't imagine that you would need any more than a small nudge on either of those two voltages to obtain 3200C14. 1.05 or lower would be my guess.
 

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I am currently running a 10850K and had to increase both voltages for stability with GPU, memory and CPU.

I am (PSA: I do not recommend 'copying' my/anyone's spoecific voltages, because each chip/board can vary small to significant differences) running (BIOS) 1.25 for SA (resulting in HWInfo reporting as 'peak' 1.262v) and 1.22 for IO (resulting in HWInfo reporting as 'peak' 1.222v).

I know this is different compared to OP chip but I (also as many others) believe the underlying architecture to be relatively similar; therefore, hopefully can be used as guidance for both OP CPU types and similar platforms as mine.

Specs:

CPU: 10850K (@ 1.29v BIOS cvore 5Ghz all core, static, no offset)
MOBO: MSI Z490 Gaming Edge Wifi (most current BIOS to date)
RAM: G.SKILL Rijpaws V C14/3200Mhz (at 1.45v 14-14-14-34/3600Mhz)
 

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I am currently running a 10850K and had to increase both voltages for stability with GPU, memory and CPU.

I am (PSA: I do not recommend 'copying' my/anyone's spoecific voltages, because each chip/board can vary small to significant differences) running (BIOS) 1.25 for SA (resulting in HWInfo reporting as 'peak' 1.262v) and 1.22 for IO (resulting in HWInfo reporting as 'peak' 1.222v).

I know this is different compared to OP chip but I (also as many others) believe the underlying architecture to be relatively similar; therefore, hopefully can be used as guidance for both OP CPU types and similar platforms as mine.

Specs:

CPU: 10850K (@ 1.29v BIOS cvore 5Ghz all core, static, no offset)
MOBO: MSI Z490 Gaming Edge Wifi (most current BIOS to date)
RAM: G.SKILL Rijpaws V C14/3200Mhz (at 1.45v 14-14-14-34/3600Mhz)
Almost identical settings here with a 9900KF.
 

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Discussion Starter #10 (Edited)
I am currently running a 10850K and had to increase both voltages for stability with GPU, memory and CPU.

I am (PSA: I do not recommend 'copying' my/anyone's spoecific voltages, because each chip/board can vary small to significant differences) running (BIOS) 1.25 for SA (resulting in HWInfo reporting as 'peak' 1.262v) and 1.22 for IO (resulting in HWInfo reporting as 'peak' 1.222v).

I know this is different compared to OP chip but I (also as many others) believe the underlying architecture to be relatively similar; therefore, hopefully can be used as guidance for both OP CPU types and similar platforms as mine.

Specs:

CPU: 10850K (@ 1.29v BIOS cvore 5Ghz all core, static, no offset)
MOBO: MSI Z490 Gaming Edge Wifi (most current BIOS to date)
RAM: G.SKILL Rijpaws V C14/3200Mhz (at 1.45v 14-14-14-34/3600Mhz)
I'm running my 9900KS in stock setting with a dynamic offset of 0.7 volts, excuse me, 0.07 xD, which brings it down to 1.3 input voltage to the CPU.

I had used to tweak stuff, disable c-state, this and that, no power limited and finding a stable voltage was almost impossible, no matter what I ran, 4.9 or 5 GHz, didn't matter.

It did work great for gaming but as soon as I had used creative apps, these things tended to crash due to cpu spikes which games never have.

Stock setting with a dynamic offset has worked the best for me so far.
 

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What about if the ram is dual ranked like 2 x 16gb Cas 14 3200? Would that need more volts?
 

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What about if the ram is dual ranked like 2 x 16gb Cas 14 3200? Would that need more volts?
I am not sure if my kit is dual ranked - but I have a GSKILL kit that is 3200/C14 12x16GB - running at 1.45v at 3600 14-14-14-34-560 with the voltages I listed in my previous post. I would tend to think it may need more volts depending on the setup.
 

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I am not sure if my kit is dual ranked - but I have a GSKILL kit that is 3200/C14 12x16GB - running at 1.45v at 3600 14-14-14-34-560 with the voltages I listed in my previous post. I would tend to think it may need more volts depending on the setup.
I think I have the same ram as you. 2 x 16gb is dual ranked. As I understand its like running 4x8gb configuration plus its cas 14 which makes it a little tougher to get stable so would imagine may need slightly more VCCSA volts.
 

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Yup I think you are correct. :) I'm just learning about it all myself over the last few weeks and tinkering. Very happy with the system now though was killing me with the freezes swapping a 480 for a 6800XT. Fingers crossed no more issues! ;p
 

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Discussion Starter #15
I'm running 4x8 Trident Z PC3200 CL14 as well but to be honest haven't found a reliable test yet.
 

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After OCing the 10700k CPU to 5.1 and getting it semi-stable with default ram speeds, the CPU was no longer stable with the ram running at its rated value of 3600 cl16. It required a bump in vccio to 1.22 and I got the vccsa at 1.28, but I think the sa can go back down a little.
 
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