How bad is high LLC?

[Airdragonz]

On my Asus Strix x570, a level 5 LLC (highest level) keeps my manual voltage constant under load. What are the downsides of running this 24/7 assuming my cpu temperature and voltages are safe? Is there any effect on the motherboard's vrm?

[Mister Woof]

i personally don't have a problem with it so long as it doesn't spike too high. 

 

If you lose a lot of voltage under load, sometimes you have to bump up the LLC.

 

Just monitor it.

[BubblyCharizard]

Steve from GN did a video with Asus on the basics

 

its not really about how much vdroop you have, but for how long it is during idle to load states.

 

it really depends on the VRM quality

 

 

[Valkyrie Lenneth]

llc is made to avoid vdroop and should only be set so that it doesnt drop but the voltage stays equal, if u set llc higher then that theres a big chance of unstability, other then that no big deal aslong ur in safe voltage range

[bignaz]

I would not use 5 for daily use. 

 

Don't have a Strix x570. But I would start at 1 check your idle and load voltages and work your way up till you find what you want. I can't say for sure use this value as I never used that board but I know 5 is to high. So just start at 1 and work your way up till you get the load voltage that you want. 

 

[Jurrunio]

the VRM can't care less. It does mean the CPU get hit with voltage spikes, not enough to hurt even in long term tho since it only lasts a couple of microseconds at a time. Can sometimes affect stability so you need stress testing.

[nick name]

A good rule of thumb is to use the second highest LLC setting.  

[just_dave]

LLC5 on this board and the X370 version is flat, so it's safe and the best option for serious overclocks

[just_dave]

10 hours ago, bignaz said:

I would not use 5 for daily use. 

 

Don't have a Strix x570. But I would start at 1 check your idle and load voltages and work your way up till you find what you want. I can't say for sure use this value as I never used that board but I know 5 is to high. So just start at 1 and work your way up till you get the load voltage that you want. 

 

It's safe in this case.

[Falkentyne]

14 hours ago, Airdragonz said:

On my Asus Strix x570, a level 5 LLC (highest level) keeps my manual voltage constant under load. What are the downsides of running this 24/7 assuming my cpu temperature and voltages are safe? Is there any effect on the motherboard's vrm?

Please never use the highest LLC.  That's only useful on subzero cooling.  It's not even useful at VERY low voltages and clocks because you actually decrease stability (compared to the same load voltage (measured directly on the CPU DIE--unless your motherboard has a VR VOUT sensor in HWinfo64, then you can use that), compared to a lower LLC and higher bios voltage.   Why?  Notice everyone here keeps talking about transient spikes?  Yes, those can be very bad at higher voltages for slow degradation (doesn't matter if it's for a few microseconds if it keeps happening over and over), but it's the transient *dips* that will cause you to crash when you think you can be stable.  That's more of a problem.

 

I'm talking about stuff like this.

I'm not even sure how those new X570 boards with 16 true VRM phases would handle something like this either.  Just use the recommended two levels below max LLC and don't go higher than 1 level below max.