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ATTN: Use as little LLC as possible!

post #1 of 7
Thread Starter 
So, this whole time I've been trying to overclock my ryzen threadripper 1950x by using the highest levels of llc, turbo and extreme. My thought process was why not? It seems that having lower voltage at idle saves me on my power bill, and having higher voltage at load gives me stability.

Before, my stable 4.0ghz overclock required a bios vcore of 1.281 and extreme llc, giving me 1.41vcore peak at load.




For testing purposes, I decided to try to use a lower LLC and see what kind of voltages would be required. To my shock, utilizing the same vcore in bios of 1.281 and level 2 LLC (standard)
I was able to achieve a fully stable 4.0ghz overclock with MUCH lower peak vcore of 1.368.


It seems that ryzen's stability is largely based off of your base vcore, not necessarily your LLC. So if you guys are attempting to use LLC to overclock with extremely high offsets, I would recommend you attempt to use a lower offset (lower llc). You may find you can achieve a stable overclock with much lower peak voltages.


This whole time I thought I had a bit of a dud, but now I realize I may have won the silicon lottery.
Edited by happyluckbox - 10/17/17 at 1:51pm
post #2 of 7
Threadripper is top 5% of Ryzen dies. Keep that in mind.
post #3 of 7
Something tells me you don't know what LLC actually does if you thought maxing it out was a good idea lol
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post #4 of 7
Thread Starter 
Quote:
Originally Posted by SpykeZ View Post

Something tells me you don't know what LLC actually does if you thought maxing it out was a good idea lol

I ran a very low vcore in bios and a high llc originally. As I understand it, LLC eliminates vdroop, but I didn't realize that the CPU is actually dependent on the base voltage set in bios and not what hwinfo or cpuz outputs.
post #5 of 7
The point of vdroop is to prevent high transients on sudden load changes. Meaning, if you do 0 droop, when you stop your CPU from a 100% load to a 0% load, this will send a momentary spike of high voltage to the CPU before the VRM can adjust. Allowing the voltage to droop under load lessens (or removes) how far the spike goes above the desired voltage.

But yes, if you can let it droop without increasing desired voltage, thats a win in my book. Lower temperatures/power used.
post #6 of 7
Oh my.

Vdroop is your voltages dropping under constant load. So when overclocking you may actually have enough vcore to keep your CPU stable, but the voltages may drop spike at some point causing your cpu to not receive it's needed voltages during load, even though you have the correct amount of vcore.

It was a crappy battle we used to go through by pumping in more vcore to compensate for that drop but in turn lead to increased heat and possible OC failure due to it.

Then comes LLC (Load Line Calibration).where it helped us stabalize the voltages between idle use of vcore and full load.

https://www.msi.com/blog/why-llc-is-your-friend-when-overclocking

I'd recommend reading this, they simplify it rather nicely. LLC is not meant to replace the use of fine tuning the max vcore your CPU needs under full load.
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post #7 of 7
Quote:
Originally Posted by SpykeZ View Post

...........snip
.....they simplify it rather nicely. LLC is not meant to replace the use of fine tuning the max vcore your CPU needs under full load.

smile.gif
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Ryzen 5 1600X 1716SUT @ 4.0 Ghz | 1.425v | LLC 3 MSI X370 XPOWER Gaming Titanium Asus GTX 780 DCII OC @ 1332/3522 mhz | 1.3v F4-3600C15D-16GTZ @ 3200 mhz | 14-14-14-14-30-5... 
Hard DriveCoolingCoolingCooling
2 x Samsung 840 Pro's 128GB RAID 0 EK-FB MSI X370 XPower RGB Monoblock | 1/2" ID EK-FC780 GTX Ti DCII | EK-FC780 GTX DCII Backplate Swiftech D5 MCP655 | EK-XRES 100 Revo D5 
CoolingCoolingCoolingPower
Alphacool NexXxoS UT60 280 | Push/Pull Thermochill PA120.3 | Push 6 x Scythe GT AP-15, 1 x SST-FN123 @ 5v SeaSonic X750 Gold 750W PSU 
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