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  1. #1
    Tech Marketing Manager HQ Array Raja@ASUS's Avatar
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    R5E VCCIN LLC 7 & 8 "measured".

    The following table shows VCCIN level 7&8 LLC idle and load voltages measured with an oscilloscope. Transient effects are also shown. Level 7 or 8 is recommended for 24/7 use.

    Click image for larger version. 

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    All other DIGI+ settings were at default. Load used to make these measurements was 260~300W.

  2. #2
    ROG Guru: Green Belt Array GoNz0- PC Specs
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    pros and cons to level 9 as my system set itself to that via auto?

  3. #3
    Tech Marketing Manager HQ Array Raja@ASUS's Avatar
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    With level 9 the voltage will be higher than what is set in UEFI when the system has settled under load. The elevation is set so that the peak voltage sag does not appear to be far away from the applied VID (for people that prefer seeing that type of stuff in software and on their DMMs).

  4. #4
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    My LLC is set to 5 by default.
    Should I set it to 7-8?
    NOTE: 5820k OCed to 4GHz @ 1.25v / 3GHz CPU Cache (stock cache voltage)

  5. #5
    Tech Marketing Manager HQ Array Raja@ASUS's Avatar
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    You can use any level you wish.

  6. #6
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    Interesting...thanks for that info Raja

  7. #7
    Tech Marketing Manager HQ Array Raja@ASUS's Avatar
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    Some captures below. Probe tips placed directly across MLC capacitor at back of socket, with short ground lead to limit noise pickup, and bandwidth limiting enabled on scope. Default VRM switching frequency. Load is around 300W generated via software:

    Click image for larger version. 

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    LLC 7 Idle to load transition.


    Click image for larger version. 

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    LLC7 load to idle transition.



    LLC 9 is more strenuous on the VRM as the voltage is increased under load. The VRM handles this fairly well however and keeps overshoot fairly tight (50mv over load voltage level) - it's set this way to appease people that think voltage should not move when faced with a load. These images serve to show that it does move - the laws of physics rule. If running LLC 9, one just needs to bear in mind that the voltage will be higher than what is set under full load and will peak around 0.1V over what is set in UEFI briefly when transitioning from load to idle. The overshoot period is very brief - says a lot about how good the VRM solutions on these boards are.



    Click image for larger version. 

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    LLC9 idle to load transition.


    Click image for larger version. 

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    LLC9 load to idle transition.


    I've posted these images to save people from getting into arguments over what to run. Pick what suits your mindset. If you care about the max voltage your CPU sees, just offset the max you're willing to feed the CPU by the peak level. So if your max is 1.95V for VCCIN, you would use 1.85V in UEFI with LLC 9 as an example.

    Do not ask me for more measurements as I have taken the setup apart and am loathe to go through with it again! I took the measurements above six weeks ago, not today. Might take a look at other things in the future on other products, but won't be revisiting this.

    Enjoy!
    Last edited by Raja@ASUS; 03-06-2019 at 01:47 PM.

  8. #8
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    Quote Originally Posted by Raja@ASUS View Post
    Some captures below. Probe tips placed directly across MLC capacitor at back of socket with short ground lead to limit noise pickup and bandwidth limiting enabled on scope. Default VRM switching frequency. Load is around 300W generated via software:

    Click image for larger version. 

Name:	LLC 7 idle to load.jpg 
Views:	815 
Size:	33.8 KB 
ID:	48770
    LLC 7 Idle to load transition.


    Click image for larger version. 

Name:	LLC7 load to idle.jpg 
Views:	785 
Size:	34.4 KB 
ID:	48771
    LLC7 load to idle transition.



    LLC 9 is more strenuous on the VRM as the voltage is increased under load. The VRM handles this fairly well however and keeps overshoot fairly tight (50mv over load voltage level) - it's set this way to appease people that think voltage should not move when faced with a load. These images serve to show that it does move - the laws of physics rule. If running LLC 9, one just needs to bear in mind that the voltage will be higher than what is set under full load and will peak around 0.1V over what is set in UEFI briefly when transitioning from load to idle. The overshoot period is very brief - says a lot about how good the VRM solutions on these boards are.



    Click image for larger version. 

Name:	LLC 9 idle to load.jpg 
Views:	781 
Size:	38.7 KB 
ID:	48772
    LLC9 idle to load transition.


    Click image for larger version. 

Name:	LLC 9 load to idle.jpg 
Views:	774 
Size:	37.9 KB 
ID:	48773
    LLC9 load to idle transition.


    I've posted these images to save people from getting into arguments over what to run. Pick what suits your mindset. If you care about the max voltage your CPU sees, Jjust offset the max you're willing to feed the CPU by the peak level. So if your max is 1.95V for VCCIN, you would use 1.85V in UEFI with LLC 9 as an example.

    Do not ask me for more measurements as I have taken the setup apart and am loathe to go through with it again! I took the measurements above six weeks ago, not today. Might take a look at other things in the future on other products, but won't be revisiting this.

    Enjoy!
    Great stuff Raja! The VRM used on the RVE are very tight at a 50mV transient overshoot! Very helpful.
    Thanks!

  9. #9
    Tech Marketing Manager HQ Array Raja@ASUS's Avatar
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    Yes its tight - under 5us settling time even when releasing a load well outside stock spec.

  10. #10
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    I have 2 questions, one for RAJA and the other one for anyone here that wants to give an advice on the picture that I'm going to ask if I'm allow to post on this sticky. At RAJA can I post here 4 pictures of my AIDA bench of two different LLC.
    "I'm not an OCer just looking a good MENTOR". UyqtCojoXecQlo.".

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