11-15-2017 12:40 AM - last edited on 03-05-2024 09:39 PM by ROGBot
11-28-2017 12:54 AM
Raja@ASUS wrote:
I use level 5 or 6.
11-28-2017 01:25 AM
11-28-2017 02:03 AM
dnd123 wrote:
Ok thanks. Do you know what amount of overshoot each of these results in?
Also, the IA XX Load Line setting, what value does Auto result in? 0?
11-28-2017 09:15 AM
Raja@ASUS wrote:
1) I'd have to measure to know for sure. On most boards/platforms, I find level 5 stays within reasonable bounds.
2) Auto is substantially higher than 0, and is affected by the SVID behavior option.
11-29-2017 08:09 PM
dnd123 wrote:
Ok thanks. Sorry for more questions:
reasonable ~= won't fry your CPU?
so does SVID behaviour have any effect if you manually set IA Load Lines, eg to 0.01? ie does it affect more than just these two values?
11-29-2017 03:08 AM
Raja@ASUS wrote:
1) I'd have to measure to know for sure. On most boards/platforms, I find level 5 stays within reasonable bounds.
2) Auto is substantially higher than 0, and is affected by the SVID behavior option.
11-29-2017 07:59 PM
AntonioL wrote:
Sorry for asking again about IA DC/AC load line settings, but I would like to be sure to understand how these options work. Is it normal, please, that increasing the impedance leads to higher voltage. My knowledge in electronics is a bit old, but as far i as remember, this setting determines the slope of the straigth line in the (I,V) diagram. The DC load line would be for steady current variation whereas the AC load line would be for transient fluctuations (sorry if those are not the exact english words, but awkward translations). So, rising the DC load line should decrease the voltage delivered for a given current request, as Vcc=Vid - R*Icc. Rising the AC load line should decrease the voltage spikes and drops when the current requested changes quickly (start and end of heavy loads typicaly). But I observe exactly the contrary, and the raising the DC load line results in higher voltage under load. Is something wrong with my motherboard, or is my understanding of load line inexact ? Maybe the logical is different for voltage regulation of a CPU that it is for the feeding of a classical non-linear circuit ?
Intel, in their datasheet, only communicates on a max impedance of 2.4 mOhms, so a 240 value in BIOS, so that the VR fits the IA characteristics. Does it mean that any value under is safe ? I found that the value advised in this forum (0.01) causes unstability, and that a setting of 1 gives a balanced voltage between idle and load with LLC on 4, for the DC load line. For the AC load line, I have no clue, should it be the same as I read in an Intel technical doc for an outdated proc gen ?
Thank you in advance for your help.
11-30-2017 01:08 AM
Raja@ASUS wrote:
The IA load lines affect the VID the CPU requests for a given level of current. Due to resistive losses through the power plane, to maintain a target voltage as the current increases, the requested VID needs to be increased. It's important to understand the difference between VID and the actual voltage.
The values needed depend on the board (power plane impedance is often better - read as lower impedance - than Intel spec), the CPU model used, and the types of load placed on the system (certain AVX workloads consume a lot of power).
-Raja