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2080 Ti - Working Shunt Mod

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post #111 of 140 (permalink) Old 03-23-2019, 12:19 PM - Thread Starter
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Quote: Originally Posted by Cyber Locc View Post
Ya my wife likes it hot in the house, so I can only bench at reasonable temps at night, till couple months. If its cold outside she wants it 80, if its hot she wants it 60, Women man. Also this is on my bench, so way rad limited. I need more rad, and more Wattage .
The way these cards drop clocks at temperature steps, even below 50°C, means lower temps are almost always good simply for that reason. My best behavior was with all the doors and windows open in winter.

After the mod I get perfectly stable clocks and voltages within each temperature bin, as temperature goes up I see it drop clock/voltage down in clean steps.

Quote: Originally Posted by Cyber Locc View Post
What aggravates me, is the curve wont stick. So I can do 2200 at 1.093, when it sticks, and I can do 1185 at 1.081 I think it is, it doesnt matter, because the curve will only let me set custom clock for 1.
The way clocks, volts, and power limit throttling interact don't make sense when simply looking at monitoring software's reports. I think things are changing even faster than we can see so the reports don't tell us what is actually going on. Differences is aliasing and/or averaging methods will cause oddities.

If I lower the power limit a lot it doesn't matter what I overclock to, I always see dips. I can set the overclock to the lowest clock it reported dipping to and it will report dipping a bit lower.

My 8K Superposition max clock of 2115 MHz is also my min clock (6033):


But the score directly below mine has a max clock of 2145MHz (6022):


Quote: Originally Posted by Cyber Locc View Post
So when the voltage drops, it drops way more clocks then it needs. I guess I need to try setting a low clock only, and see what it does for the upper clocks. The card just doesn't want to let me manage it, and I cant stand that.
I think most of that really is the power limit, when it isn't temps. Watch the "Performance Limit - Power" in HWiNFO64 or Afterburner's "Power limit", do you see it triggering? I also miss the days of set and forget GPU clocks, until I remember cards that died fast due to thermals (today's cards would downclock) and the general quality of the hardware then. A new "I don't mind if you die" option to take total control would be great though.
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post #112 of 140 (permalink) Old 03-23-2019, 01:40 PM
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Quote: Originally Posted by Asmodian View Post
I think most of that really is the power limit, when it isn't temps. Watch the "Performance Limit - Power" in HWiNFO64 or Afterburner's "Power limit", do you see it triggering? I also miss the days of set and forget GPU clocks, until I remember cards that died fast due to thermals (today's cards would downclock) and the general quality of the hardware then. A new "I don't mind if you die" option to take total control would be great though.
Yes, thats my issue though.

The when it downlocks, it lowers the power limit first. Which makes zero sense, if its not hitting the current power limit, and temps are fine, why drop it? So what happens when it downclocks, is it drops the Power target from 130% to 115%-124%, and then the clocks drop. again for no reason.

In Heaven and Valley the PT stays at 130%.

Ill try that other bench later, I been out the game for awhile lol, Lots of new stuff .


The other thing I noticed, if I just up the power target to 130 and leave the clocks alone, the card clocks up to 2050 by itself, and it drops then into the high 1800s, low 1900s and back up. However with my overclock, it drops from 2190 to 2025 at lowest, so I dont think its a thermal limit, or a power limit, as that doesn't make any sense. If either was the cause, it would stop down clocking if its at lower clocks, and it doesn't stop. The card just down clocks, for seemingly no reason.

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post #113 of 140 (permalink) Old 03-23-2019, 11:31 PM - Thread Starter
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Quote: Originally Posted by Cyber Locc View Post
The other thing I noticed, if I just up the power target to 130 and leave the clocks alone, the card clocks up to 2050 by itself, and it drops then into the high 1800s, low 1900s and back up. However with my overclock, it drops from 2190 to 2025 at lowest, so I dont think its a thermal limit, or a power limit, as that doesn't make any sense. If either was the cause, it would stop down clocking if its at lower clocks, and it doesn't stop. The card just down clocks, for seemingly no reason.
I think hitting the power limit causes very very short declocks to very low speeds. When it triggers it goes to 300 MHz for xx microseconds, or something similar, so we see these randomly timed stops averaged into our normal max clocks. This causes the reported clock rate to fluctuate down but that does not tell us anything about the real min clock that would allow it to never throttle.

Also, Nvidia has done a pretty amazing job at keeping power down without hurting performance very much. Increasing the max clock keeps increasing performance, even when the card is already triggering the power limit. I like steady clocks but it looks like opening up the power a lot is usually worth less than a +50 MHz OC, unless you have an unusually power heavy load. On battery or heat constrained I think this throttling tech would actually be very good.

I am not sure about your auto-decreasing power limit, I never saw that with my FE 2080 Ti.
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post #114 of 140 (permalink) Old 03-24-2019, 01:41 PM
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Quote: Originally Posted by Asmodian View Post
I think hitting the power limit causes very very short declocks to very low speeds. When it triggers it goes to 300 MHz for xx microseconds, or something similar, so we see these randomly timed stops averaged into our normal max clocks. This causes the reported clock rate to fluctuate down but that does not tell us anything about the real min clock that would allow it to never throttle.

Also, Nvidia has done a pretty amazing job at keeping power down without hurting performance very much. Increasing the max clock keeps increasing performance, even when the card is already triggering the power limit. I like steady clocks but it looks like opening up the power a lot is usually worth less than a +50 MHz OC, unless you have an unusually power heavy load. On battery or heat constrained I think this throttling tech would actually be very good.

I am not sure about your auto-decreasing power limit, I never saw that with my FE 2080 Ti.
I think it has semblance to what you said, when my power limit hits 130% it drops it, it does not allow for the PL to ever stay at 130%, it says 130% for a split second and then its reduced to 100%, and then climbs back up, hits 130% again and then its forcefully lowered again.

I watched in HWmonitor, and my card never even gets the max wattage they claim it can. The wattage will climb to 338, the second it hits 338, it drops immediately down to 250, and then climbs back up.

I'm not too disappointed though, as apparently from watching some videos today, It took jay a AC cooled rad to get a 7722, and I got 7715 (https://www.3dmark.com/spy/6676616), with 68f ambient on a standard loop

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post #115 of 140 (permalink) Old 03-25-2019, 07:33 AM
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noob question: so I did the shunt mod, but how do I know it actually works without multimeter?

Before i could do 2160, depending on temps, if it stays below 38c it sticks, if it goes above 40c it goes down to 2145mhz. Now after the mod it kinda still does the same?

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post #116 of 140 (permalink) Old 03-25-2019, 08:00 AM
 
 
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Quote: Originally Posted by dante`afk View Post
noob question: so I did the shunt mod, but how do I know it actually works without multimeter?

Before i could do 2160, depending on temps, if it stays below 38c it sticks, if it goes above 40c it goes down to 2145mhz. Now after the mod it kinda still does the same?
Shunt mod affects power limit, temperature bins still apply.

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post #117 of 140 (permalink) Old 03-25-2019, 02:52 PM
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Quote: Originally Posted by Asmodian View Post
I think hitting the power limit causes very very short declocks to very low speeds. When it triggers it goes to 300 MHz for xx microseconds, or something similar, so we see these randomly timed stops averaged into our normal max clocks. This causes the reported clock rate to fluctuate down but that does not tell us anything about the real min clock that would allow it to never throttle.

Also, Nvidia has done a pretty amazing job at keeping power down without hurting performance very much. Increasing the max clock keeps increasing performance, even when the card is already triggering the power limit. I like steady clocks but it looks like opening up the power a lot is usually worth less than a +50 MHz OC, unless you have an unusually power heavy load. On battery or heat constrained I think this throttling tech would actually be very good.

I am not sure about your auto-decreasing power limit, I never saw that with my FE 2080 Ti.

Looks like im overreacting anyway, that 7702 would have landed me in the top 60 of Timespy Extreme, if not for the crap Haswell E CPU. We will fix that, RVIEO and I9 9940x on the way

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post #118 of 140 (permalink) Old 05-29-2019, 07:12 AM
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Hi guys

this is my baby, msi rtx 2080ti gaming x



i am getting mad cause of frequency throttle, can't find a bios that fix it properly.
do you think is possible to shunt it? i did shunt mod on my Titan pascal and worked great for years

this should be the 8pin resistors:



the one in the left corner should be the pci-e resistor and i think is not fine to shunt it, right?



do you think using metal pen or liquid metal works? or the only way is soldering 8 mOhms?
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post #119 of 140 (permalink) Old 05-29-2019, 07:47 AM
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You are throttling due to only power limit, correct? Not temp or anything like that?

If only PL, then yes, shunting will give you more headroom.

Those should be the correct resistors. Please verify with a DMM first however. Plenty of videos on how to check continuity out there.

The one in the lower left can be left alone, yes.

Liquid metal is not recommended. Metal pen, while not as corrosive to the components, is still not the best method. Soldering the 8mOhm resistors on is the most reliable way to do this.

I did one of my eVGA 2080Ti's and have been nothing but happy. For 24/7 gaming use, I can set to 2075 core and be done on the stock BIOS which gives me the best memory clocks. Plays everything in 1440p at 144 fps (Gsync max for my monitor). Water cooled, I hit high 40's load after about 60 minutes of gaming and it stays there.

Quote: Originally Posted by mattxx88 View Post
Hi guys

this is my baby, msi rtx 2080ti gaming x

Spoiler!


i am getting mad cause of frequency throttle, can't find a bios that fix it properly.
do you think is possible to shunt it? i did shunt mod on my Titan pascal and worked great for years

this should be the 8pin resistors:

Spoiler!


the one in the left corner should be the pci-e resistor and i think is not fine to shunt it, right?

Spoiler!


do you think using metal pen or liquid metal works? or the only way is soldering 8 mOhms?

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post #120 of 140 (permalink) Old 05-31-2019, 01:04 AM
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thnaks for your considerations Renegade

but if you don't want to solder, may it be another way?
what do you think about copper conductive tape?
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