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Arne_Saknussemm · ‎03-10-2018

If I leave things at stock...as you all know...the XFR/performance boost will try for 4.2GHz on some cores and you see voltage spiking to the 1.5v mark

Since I can run my CPU at 4.1 at 1.325v and 4.2 at 1.35v I was naturally assuming a negative offset would bring this spike voltage down...and it does

I set -0.09v and I drop that spike to 1.4v....I am still working on getting this down but obviously somewhere the negative offset will be too low for idle 0.785 at the moment so I'm not going to push it.

BUT

How come if I set the multi at 41 for an all core OC I have to set offset to +0.075 to get 1.325v?

Is there something fubar with the vid multi tables in the BIOS?

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gupsterg · ‎03-11-2018

Nope.

When CPU is pushed out of base clock, 3.5GHz in your 1920X case, by 25MHz OC mode engages on CPU. The CPU will snap to default ceiling VID of PState 0 (ie Base clock). My 1950X has celing VID of 1.1625V for PState 0.

Note I said ceiling VID. At stock for base clock of 3.5GHz you won't be using ~1.25V. As SMU determines if it needs to go to ceiling VID or not. Ryzen/Threadripper is basically VID'less CPUs at stock. The SMU profiles silicon and based on it's unique properties determine what VID/VCORE to use for states.

When we OC we OC Base Clock. Precision Boost/Extended Frequency Range is disabled when CPU enters OC mode.

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Arne_Saknussemm · ‎03-12-2018

gupsterg wrote:
Ryzen/Threadripper is basically VID'less CPUs at stock

Cheers gupsterg...I had kind of decided something like that must be happening...all good then!

I have to say...I'm much happier now with my voltage spikes being tops 1.4 rather than 1.5+

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gupsterg · ‎03-29-2018

No problem 🙂 . TBH when spikes occur as it's lower core count/momentary boosts, etc it's not an issue AFAIK.

I recall on OCN a discussion via PM with a member going through several days of testing using a negative offset. For some reason at idle he'd have an issue. By the time he got the offset correct so idling for lengthy period was not an issue he was using such a small negative offset it seemed futile to use it. I guess some CPUs may handle it better others not so.

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Arne_Saknussemm · ‎03-29-2018

Hey gupsterg...yeah I was wondering if prolonged idle would be a problem but it doesn't seem to be for me...I actually haven't pushed the offset further because I don't want to start BSODing and it's fine as it is now...1.4ish seems better than 1.5ish

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gupsterg · ‎03-29-2018

Sweet 🙂 .

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R9 5900X - Custom WC - ASUS Crosshair VII Hero WiFi - Ballistix Sport LT 2x16GB 3800MHz C16 - RX 6800 XT - WD SN770 2TB - 2x 870 EVO 4TB

24/7 OC: i5 4690K @ 4.9GHz CPU@1.255v 4.4GHz Cache@1.10v - Archon SB-E X2 - Asus Maximus VII Ranger
Sapphire Fury X (1145/545 ~17.7K GS 3DM FS)
:eek: CPU Validation 5.198GHz@1.314v with 4.4GHz cache + RAM 2400MHz@1T :eek:
Da Music video

Offset conundrum