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Default voltages for VCCIO, VCCSA & CPU VRM ?

Mappi75
Level 8
Hi! Atm i want to optimize my 6950X rig (running the defaults with lowest/default voltages).


i want to know:

what are the default voltages for VCCIO & VCCSA ?

Because i'am using a 6950X & Asus V10 & 128GB RAM (Kingston 2.666 Kit),
and i think the mobo gives more power than needed:

VCCIO: 1,048V
VCCSA (CPU System Agent Voltage Offset Mode Sign): 1,160V
CPU VRM: 1,888V

I know from my past system and my x299 system system voltage was default @0,900V but it runs with 0,880V stable to.

VCCIO default voltage is 1,05V ?
in UEFI its named: VCCIO CPU 1,05V Voltage.

CPU VRM can be @ 1,800V or should i leave it @ 1,888V ?

Thanks for helping!

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Nixon2992
Level 7
Mappi75 wrote:
Hi! Atm i want to optimize my 6950X rig (running the defaults with lowest/default voltages).


i want to know:

what are the default voltages fir VCCIO & VCCSA ?

Because i'am using a 6950X & Asus V10 & 128GB RAM (Kingston 2.666 Kit),
and i think the mobo gives more power than needed:

VCCIO: 1,048V
VCCSA (CPU System Agent Voltage Offset Mode Sign): 1,160V
CPU VRM: 1,888V

I know from my past system and my x299 system system voltage was default @0,900V but it runs with 0,880V stable to.

VCCIO default voltage is 1,05V ?
in UEFI its named: VCCIO CPU 1,05V Voltage.

CPU VRM can be @ 1,800V or should i leave it @ 1,888V ?

Thanks for helping!

Dear.
Stock VCCIO for Broadwell-E: 0.95v
Stock VCCSA for Broadwell-E: 0.95v
Stock VCCIN for Broadwell-E:1.8v
Critical voltages for SA/IO is 1.3v.
If is more than 1.3v you potentialy have ability have dead CPU across month with MB Q-CODE:00.
When overclock ram always maunaly fix SA/IO .ASUS motheboard like overvoltage this rails CPU.
See DC Spec vol. 1 DS for Broadwell-E.
https://www.intel.com/content/www/us/en/processors/core/core-i7-6xxx-lga2011-v3-datasheet-vol-1.html

Chino
Level 15
Use the values assigned by the motherboard as a starting point. If you're fixed to use the lowest values, start lowering them until you encounter instability.

Mappi75
Level 8
Thank you very much for your help!

VCCIN is CPU VRM(in Aida) ?
Then i will test 1,800v instead of 1,888v.

Mappi75 wrote:
Thank you very much for your help!
VCCIN is CPU VRM(in Aida) ?
Then i will test 1,800v instead of 1,888v.


Yes.CPU VRM voltage for FiVR in AIDA64

Mappi75
Level 8
@Nixon, thanks for your help!

Wondering why my Mobo gives more voltages than in oc video guide (6950x/v10) from "der 8auer" (maybe its the old bios).

In the past i use a 3-way-Titan Black SLI and the (auto) voltages are even higher than only using one 1080ti.

Mappi75 wrote:

Wondering why my Mobo gives more voltages than in oc video guide (6950x/v10) from "der 8auer" (maybe its the old bios).


Each CPU is unique.

Stock VCCIO for Broadwell-E: 0.95v:

Why its called in the UEFI "VCCIO CPU 1,05V Voltage" ?
So i set in the past 1,05V but as above mentioned 0,95v is the default voltage for Broadwell-E.

Stock VCCSA for Broadwell-E: 0.95v:
runs only with 0,86v @auto (with 128GB RAM no probs here)

Stock VCCIN for Broadwell-E:1.8v:
on "auto" it will give 1,888v - manual 1,80v ends in 1,792v (works without probs).

So far so good..

-----------

Now i want to over & undervolting the system (10x4.000Mhz).

Strange: if i set the cpu voltage with adaptive mode & offset mode CPU-Z/Core-Temp/Aida64 never change the voltages.

Does the adaptive/offset mode not working with Broadwell-E ?

The setting was like:
Fully Manual Mode: Disabled
CPU Core Voltage: Adaptive Mode
Offset Mode Sign: "-"
CPU Core Voltage Offset: 0,110
Additional Turbo Mode CPU Core Voltage: 1,250
Total Adaptive Mode CPU Core Voltage = 1,140

Mappi75
Level 8
Stock VCCIO for Broadwell-E: 0.95v

Why its called in the UEFI "VCCIO CPU 1,05V Voltage" ?

So i set in the past 1,05V but as above mentioned 0,95v ist the default voltage for Broadwell-E.