How to adjust VCore voltage

[Viper]

I am interesting in making my system run just alittle cooler. I have never played with the VCore Voltage before. The default setting on My Asus Maximus X for VCore is Auto. I have monitored the VCore under use and the max it seems to get to is 1.245. IF I set this Voltage manually what exaclty am I changing since it is constantly changing with it set to Auto from .6 V up to 1.245 V. Does this just change the Max or am I changing the Vcore to always run at one set voltage which actually seems like it would make my temps far worse. as the average voltage would be much higher.

[Sapph]

tweaking it manually on Intel systems will still let it go down if I remember right. So it will just set the maximum.

[Omega]

Lowering the voltage might also requires you to lower the clockspeeds to maintain stability. If you are doing an underclock you want to use Adaptive or Offset to keep the voltage dynamic. Same for the clockspeeds, you set it to scale per core based on workload and not run at 100% all the time.

Underclocking a CPU is not worth it. Just buy a better cooler. Also your temps are most likely fine, 70c will make no difference over 60c. But some people have the idea that lower = better.. lower makes zero difference unless the chip is overheating.

[Viper]

Okay ..thank you. I will just leave it be I think.

[Peabrain]

Changing from auto to manual as in just adding a new value will mean it stays at that value constantly regardless whether clock speed is 800mhz or 4600mhz. Changing it you want a set vcore so you can test stability.

Once you know it is stable you change to dynamic voltage or DVID on my Gigabyte board....not sure on yours but same procedure. You enter the difference between voltages and the voltage will then drop along with clock speed and increase with clock speed like it did on Auto. Only this time at a lower voltage.

Example. Using your Auto vcore setting of 1.245

Highlight Vcore Auto and enter 1.200 save and exit. Load a hwmonitor, hwmonitor, cpu-z or other that will show % of each core. Run prime95 v26.6 for 15 minutes. Make sure each core is running at 100% If no crashes and all cores at 100%. (I dont expect any at this point.) Reboot and enter bios. Change vcore to dynamic and enter the difference as the adjustment to make.

1.200 - 1.245 = -0.045

Save and exit. Now at vcore will go up and down with changes in clock speed like it did when it was set at auto. At each stage it will be -0.045 that of the auto setting.

If you want to stop here run prime for a few hours while you go out, do chores or something. At this point there shouldnt be an issue.... if you have a semi decent chip. Any crashes change your dynamic voltage to -0.040 and try again.....change 0.005 each time. Again I doubt any issues with a 0.045 reduction in volts.

If you want to keep going manually set vcore to 1.145 or 1.175 and repeat testing as above. The lower you go the more you risk crashes. Even if you find a stable vcore when manually set you can still get crashes when switches to dynamic vcore due to Vdroop and stuff. Can use loadline calibration, LLC, to compensate but that'll require more fiddling.

As you didnt want to fiddle too much I'd say try these adjustments if one fails go back to previous one so you dont need loads of trial and error.

So start at manual vcore 1.200 then 1.175 then 1.145 testing with prime v26.6 for 15 minutes in between. If you get no crashes, great, change to dynamic voltage and enter the difference
current voltage - auto voltage = dynamic voltage setting.
1.145 - 1.245 = -0.100
1.175 - 1.245 = -0.070
1.200 - 1.245 = -0.045

Trying to go lower and you have a higher risk of needing LLC tweaks.

I've been lucky with all my chips and so have several of my friends. None have had an issue with a dynamic voltage of -0.100 I'm currently using -0.140 on my 7700k, I can go lower but hate using the LLC and other setting changes.

[Viper]

What I actually did which has made a significant decrease in Temps.4C-5C. Was change the SVID setting from Default to Typcal Case in Bios. Default uses the Worst Case Setting. There is also a Best Case setting. But this setting keeps VCore voltages at the lowest voltages determined by the Intel Algorythms. and has the potential to cause instability in the System. This is the same as messing with the VCore myself but instead allows the Bios to automatically use a lower setting for VCore that is good for a typical CPU. Default setting use the VCore that will work no matter what for this CPU.

Actully with the Typical setting my VCore is now maxing at 1.2V and minimum .575V. Not sure where it would be if I changed the setting to Best Case.

[Peabrain]

Didnt know about that. Is a nice option to reduce time testing and teaking. 4/5 is a nice improvement :) same vcore I suggested for first tweak so I got that one perfect for a low risk setting.

If 4/5 degrees is enough Im glad it was so simple...........kinda wish I had known of that setting on your board, would have saved me typing all that using my tablets screen ha

[Viper]

Peabrain の投稿を引用：

Didnt know about that. Is a nice option to reduce time testing and teaking. 4/5 is a nice improvement :) same vcore I suggested for first tweak so I got that one perfect for a low risk setting.

If 4/5 degrees is enough Im glad it was so simple...........kinda wish I had known of that setting on your board, would have saved me typing all that using my tablets screen ha

Thank you for taking that time. I appreciated that info as it did help me to understand the procedure better.

[Monk]

As a note to temps, when pushing benchmarks my 7900x can run in the mid to high 90's even delivered and under a custom loop, and there is zero danger or issues doing so, if the chip isn't throttling or powering off (due to spiking beyond safe temps for more than a Ms or two), there is essentially no difference between 90c and 60c as far as performance goes, stable is stable.

[Peabrain]

Monk の投稿を引用：

As a note to temps, when pushing benchmarks my 7900x can run in the mid to high 90's even delivered and under a custom loop, and there is zero danger or issues doing so, if the chip isn't throttling or powering off (due to spiking beyond safe temps for more than a Ms or two), there is essentially no difference between 90c and 60c as far as performance goes, stable is stable.

Completely agree. Would like to add higher temps means higher rpm for cooling fans resulting in more noise. If you can make it cooler without new cooling hardware itll run quieter. My 7700k boosting to stock 4.5ghz I can run prime for hours and it wont hit 80 Celcius while fans only hit 1100rpm out of 1800rpm. Gaming wise it wouldnt hit 70 Celcius while fans dont exceed 1100rpm. Custon fan curve to keep cpu cool with reasonable quiet noise levels.

I could get it cooler but I aimed for acceptable noise, provided cpu doesnt hit 90 Im happy with its temps.

Before someone comments why Im running a K at stock speeds. Ive got OC profiles setup saved but havent had the need to use them yet.

[Monk]

At full boost, that's only a single core so will be considerably cooler than an overclocked boosting all cores.

Forgot to mention in my post, those temps are at all 10 cores at 5-5.1GHz, under normal use at 4.8GHz (all cores) it tends to run in the 50-70c range depending on load.