yashsingh1/xdaforums huggingface dataset:
[Galaxy Tab S General] nauvho:
Why pads are placed on other then CPU? This is the design of the cooling by Samsung, all of the radiators connect to the black cooling pad on the back cover, also they could help CPU temp when they are connected. Further more, you can't increase the height on CPU only and skip the others, this will disconnect them from the cooling pad and also would increase the gap between the back cover and the board, thus making it prone to cracking if you hold it tightly with fingers.

My Ampere shows steady 1480 mA while charging, I'm with original charger, not original cable.
[Galaxy Tab S General] Multipanda:
Have you considered using thermal paste instead of thermal pads? It might look a bit messy, but should offer better cooling. 84 degrees is still a pretty high temp.

It would be great if we could actually have this tablet for a full decade, lower temps will help ensure that dream comes true ;)
[Galaxy Tab S General] nauvho:
Thermal paste does not offer better heat conduct then pads, paste is used for better contact with coolers as it is smooths out surface imperfections, here you don't have cooler or direct contact to the cpu.
[Galaxy Tab S General] Multipanda:
Actually paste tends to have better thermal conductivity compared to pads, which is why I was interested in the comparison. It doesn't really matter what it's in contact with just that it's in contact with something where it can transfer heat so it should be able to do the same job as pads, just better... but also messier.

As an example: The Arctic thermal pad has a thermal conductivity of 6 W/mk while the midrange Arctic MX4 paste has a thermal conductivity of 8.5 W/mk.

Thermal pads aren't generally used because they are better for cooling, but because they are faster and easier to install and remove.

At some point when I have the time I'm gonna try with paste since I have plenty of that, but I was curious whether it would make a significant difference and thought it might interest you if you want to either eke out a bit more performance or get the temps lower.

Just my 0.02
[Galaxy Tab S General] nauvho:
You have a lot to learn about cooling, you should not compare thermal pads made for memory chips vs paste made for CPU, the purpose is different. Are you aware that there are copper thermal pads made for GPU and CPU with over 400w/mk? Here is an example 407w/mk. As i said, paste is used for making good contact, as nothing is really flat and there are micro surface imperfections that paste covers, that's the purpose of the paste, copper will always be better then any paste ever.

Here a useful article about thermal paste to learn something :)

What is thermal paste and what does it do?

Thermal paste is a very high heat conductive paste that is used between two objects (usually a heatsink and a CPU/GPU) to get better heat conduction. It fills in all those microscopic imperfections on the heatsink and CPU/GPU that can trap air in them and cause a loss in the heatsink’s performance. Air is a very poor conductor of heat. Thermal Interface Materials (TIM) can be up to a 100 times greater conductor of heat than air.

However, thermal paste is not near as good of a conductor as copper. Thus, too much thermal paste will hinder a heatsink’s ability to cool properly.

Cheers ;)
[Galaxy Tab S General] crusader2100:
Mod difficulties

So I made an account specifically because I tried this mod and am trying to revitalize my Tab like you mentioned and I ran into a hiccup. It seems that Lineage has some issues with the microphone/sound, or making wifi calls such as Duo, Skype, etc. You can make an initial call/use the microphone/speakers, but then it will cut out and become unusable until you restart the Tab. The issue with this is, that's an issue for my usage as my kids also use it to talk to their grandparents and other friends. I ended up reverting back to Stock Rom with the Thermal pads applied and it seems without the CPU tweaks that are mentioned, the pads themselves make little difference on Stock.

Seeing that the CPU control app is tailored to the custom kernel on Lineage, is there no other way to alter the clocks on Stock? Or, is there another build of Lineage without the sound issue? Honestly, just anything to get some more life out of this Tab would be appreciated. I'd hate to have to update needlessly.
[Galaxy Tab S General] MrVaglna:
Same as me, just created this account to appreciate ur work. You brought me the idea to reincarnate my old boy. Iam running this tablet right now with Min 1000mhz @ 0,875mV and max 1,6hz @ 1,000 and getting around 82 without thermal pad update. The tablet is now super fast. The only thing that bothers me is the battery drain while in standy screen turned off. Over night it drains around 20-30% instead of 2-3 like b4. Iam trying to find my sweetspot to get 600mhz min running, but i guess i will lose the fast performance from the start? Is there any possibillity to cap the mhz to 600 only while in standby?
[Galaxy Tab S General] nauvho:
I'm not aware of any sound issues are you using the one from my link? if so maybe its the build number specific as they release new builds almost weekly, mine is from October, or maybe just reinstall it again cleanly and make sure you clear all partitions including cache one. Regarding the thermal pads i have explained how to check if you need them before doing it first :)

As i have explained this already, minimum speed won't affect your device performance, but only initial app launch animations and things like that could be a bit choppier, nothing else, you can set it as low as you want and choose the proper CPU government, but please do me a favor and read previous messages, as it is frustrating to repeat the same thing over and over for everyone who is lazy to read :)
[Galaxy Tab S General] crusader2100:
Thanks for the reply! I will try the specific October build that you used and see what happens.
[Galaxy Tab S General] Marian94:
IMG="samsung tab"]https://imgur.com/gallery/Kb7Djqx[/IMG][/QUOTE]
[Galaxy Tab S General] hornetoli:
update and feedback

Hi all,

so - finally I applied the above mentioned pads to my T800 and went through the described setup and testing procedure.

Current status is, that I have applied a maximum of 1700MHz @ -75mV global to CPU, which seems running stable for several

minutes @ ~89 ...90°. So far I guess this is quite ok. Thx again for that great mod.

Minimum frequency I probably will even lower down to 100Mhz or so - will do some test how that feels during interaction.

I currently do experience one issue - seems like settings are not re-applied after boot propperly. I am on a Lineage OS version from Dec last year.

So probably thats some hickup there in that nighlty build - will play around and try to understand and fix.

One question I have: I don't exactly understand, why did the GPU settings as stated in the initial post:

"GPU set to be always used and at minimum of 480mhz (with setting in dev options to always use gpu for 2d composition)"

Why "always used"? I assume this will prevent GPU from going to possible deeper sleep stages then - right!?

So that will drain more power - but whats the reason for it? Shorter response times - more fluent graphics!?

And why you increase lower freq. limit to 480MHz? During non-usage it will the drain much more power than the standard 100MHz - right?

Or is it to improve response time of the graphical interface (screen) during standard usage dramatically?

Thx a lot!

Kind regards, hornetoli
[Galaxy Tab S General] nauvho:
There is option to apply settings on boot in the kernel auditor (you can see it in my video at 0:51 sec, but only use it once you are absolute sure about the settings, because if you apply bad settings you may not get into system, otherwise i don't know about the build.

Regarding the GPU and CPU minimum speeds, you are right, I'm using my tablet 99% of the time hooked on the charger, so power use is not a concern for me, and i aim to squeeze as much performance as possible and eliminate animation stuttering and similar. You can safely use the lowest possible minimum frequency for maximum battery life, as this won't effect overall performance. I also find that for web browsers, using the option to to use GPU for 2d composition works better, especially for JavaScript heavy websites.

The thing is, in my view this tablet does not have enough RAM memory for the default resolution, and instead of all animations and apps being stored in memory they fall back to the CPU and GPU as they have been suspended due to RAM shortage, this is where the stuttering comes from. If you lower the resolution to 1080p, you will see how smoother and better the tabled works, especially when you have multiple apps opened, the reason is 3GB are not enough for the WQXGA 2560 x 1600 resolution, especially in 2020 when each app takes much more memory then in 2014 and i don't want to lower the resolution :)

As i said before you need to adjust settings to best suite your usage, you don't need to use mine 1:1 especially the minimum speeds :)
[Galaxy Tab S General] hornetoli:
Hi nauvho,

thx for your reply. Of course I did set that option to apply settings on boot (sorry, I wasn't clear about that in my previous post) but somehow still some settings didn't get applied after boot, whereas others had been. I assume this being an issue in that build. I played arround with the settings a bit and now seems to be set propperly and also re-applied after boot ...

For the min. freq. settings - ok, got the point. In fact I did apply lowest possible min. frequency now and seems a bot choppy at first touch before it applies higher frequency but then runs smooth ... so for browsing etc. good enough for me and helps to extend run- time.

Whereas the max. frq. setting to 1700Mhz runs stable for a while for higher performance demanding situations - almost perfect now.

Kind regards, hornetoli
[Galaxy Tab S General] nauvho:
Nice. I'm glad to hear that.
[Galaxy Tab S General] JhonataKFZ:
Thermal Paste

A question please, can I paste the foam with thermal paste? or can the problem? and thank you so much for your help
[Galaxy Tab S General] nauvho:
I don't advise you to do that.
[Galaxy Tab S General] oct2274:
I'm new to all of this, but yesterday I successfully did the thermal mod and loaded Lineage as suggested and everything went perfectly. I'm now at the point where I need root so that I can utilize Deathly Adiutor.

I see the option in the developer area, but it only shows ADB

What are people using to root now? I see there is CF-Auto-Root, but it looks like it sets you back to stock recovery? I guess I don't have a problem with this necessarily, but again I'm new and just want to make sure I'm not going to totally hose things up.

If it does load stock recovery, is it ok to flash back to twrp? What is suggested.

I'm also reading about Magisk which seems like a good alternative if it's compatible.

One more thing, i see a lot of mirrors for files are down. Please link to whatever root you feel is appropriate.

Any help or advise is greatly appreciated.

Thanks!
[Galaxy Tab S General] oct2274:
I figured it out, didn't realize there was an addonsu zip for LineageOS that you could flash to give you app root.

---------- Post added at 07:27 PM ---------- Previous post was at 06:39 PM ----------

Just an FYI, one 1mm pad wasn't enough to make a reasonable difference over the cpu. I had to stack two 1mm pads(not optimal) to get things to cool down. I'll be buying a 2mm pad and doing more testing.

---------- Post added at 07:58 PM ---------- Previous post was at 07:27 PM ----------

What method are you using to lower resolution (app? built in utility?). I think this would dramatically help me with one of the games I play. Thanks for all your help btw. This is such a great thread!
[Galaxy Tab S General] nauvho:
Yeah when you install lineage os you should add root app with it as long as google apps etc. About the pads yeah it really depends on the gap, i guess back cover can bend a lot. For resolution i use an app from the app store "Easy DPI changer [root]", with it you can change resolution and the DPI so you can scale the interface to your liking, but beware if you enter wrong number you will destroy the tablet's resolution and may need factory reset, so be careful before hitting apply button that you have entered correct settings.
[Galaxy Tab S General] nauvho:
Seems throttling issues are getting more and more frequent with mobile devices :D

[YOUTUBE]https://www.youtube.com/watch?v=78dHkn1O1EM[/YOUTUBE]
[Galaxy Tab S General] MadHatter806:
HAHAHA So Funny!

Ha! Love the video... Peltier cooling a phone... LMFAO.

But also thanks so much for the thread and advanced ideas to keep this tablet modern! Have already applied a few of your suggestions (different numbers as yet) and seen a vast improvement. Thermal Pads arriving later this week, test this weekend. THX SO MUCH!

Also would love to hear more about heat pipes and copper pads if you ever choose to test such!
[Galaxy Tab S General] JhonataKFZ:
Can it spoil? better use only the thermal pad?
[Galaxy Tab S General] nauvho:
Thanks, someday will test pipes or pads too.

I just don't see any good reason to use thermal paste, and i see plenty of bad reasons, it has been discussed before in this topic, get back and read.
[Galaxy Tab S General] JhonataKFZ:
I did the installation of the Thermal Pad today, see how it turned out, it stopped heating up thank you very much friend for the help, I have a doubt, in your video on the GPU Core Control option you leave Apply on the startup option disabled, that's right. thanks
[Galaxy Tab S General] hoffen:
As a final result i have managed to bump the CPU from 1400mhz to 1600mhz with 1087mV voltage and at max 84C (down from around 90 at 1400mhz) at constant 100% CPU stress. The performance gains are around 100 to 150% (At around 42-47k GIPS up from 20-25k GIPS stock in CPU Throttling test). Additionally i have to say, its extremely easy to open the back cover panel.

How about t700?

Same CPU,Same GPU

Can i try with the same voltage and mhz?

Thanks

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[Galaxy Tab S General] nauvho:
You can apply the same method to find out the situation, but voltages and frequency would be different i guess.
[Galaxy Tab S General] hoffen:
Thanks!!!
[Galaxy Tab S General] nauvho:
Good job, nice :good:
[Galaxy Tab S General] maxq1:
disassembling the device do seem easy but how about re-assembling it? do you need to glue it back on? or are there small clasps to lock in the 2 major parts? might try this on my t700. have 1mm thick arctic pads from previous gpu oc'ing. throttling on this tablet series is indeed bad. on the throttling test, rarely do i see it on 1.9~1.7 ghz and is usually on 1.0~1.2. don't have deathly as i'm on rr so i can't actually see thermals
[Galaxy Tab S General] hoffen:
Reassembling with small claps

I have also woth 1 mm arctic pad

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[Galaxy Tab S General] maxq1:
thanks, man! done w/ the modz & testing.

may have lost out on the silicon lottery. highest i could get w/o throttling is 1.5. at 1.6 i'm throttled to 90%. staying on 1.5 for now. still, ways better than stock considering rr kernel don't allow voltage tweaking. thanks for sharing, OP! literal life saver for this tab
[Galaxy Tab S General] Shase:
Hi. I might be wrong and rusty in my skills. But I have flashed LineageOS, addonsu and gaps. But when it start up I do not have root access for Deathly Adiutor. Anyone know what I am missing?

Update. I was rusty indeed. Forgot to give my self root access in the settings. Now I have it. Thanks for this great tip.
[Galaxy Tab S General] maxking:
hi, I also have a t705, have you updated the image with the lineage and modified the overclock or have you just inserted the thermal pads?
[Galaxy Tab S General] hoffen:
Updated und modified

But not thicked apply on boot on deathly auditor

Problems......reboot

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[Galaxy Tab S General] crusader2100:
Sorry for the late update, but I finally got around to doing a fresh install using the build you mentioned and it seems to be working well. I put it off due to the USB/Charging port going bad, but once I realized how cheap a replacement was, I fixed it and the tablet is now functioning quite nicely. I appreciate all the work you have done and documenting it as well!
[Galaxy Tab S General] MrVaglna:
I replaced a new original battery into my modified tablet. Still sucks out battery life within 24hours by just being powered up and not doing anything. Tweak might be usefull if u have ur tablet docked all the time or just for 1 hour surfing, but considering the 4hours charging time its a no go to be used as a portable tablet.
[Galaxy Tab S General] nauvho:
You do realise that, without the mod cpu always throttle to 650mhz even for browsing right? ofc at 650 MHz you gonna have great battery life....

Just set the minimum frequency to minimum and battery life should be as stock if stock CPU cooling worked correctly. This will bring some stutter on app lunch etc, but you still will gain the performance for the intensive tasks., and it's been said over 10 times now.
[Galaxy Tab S General] nauvho:
I did a little testing. I have set minimum frequency to lowest possible to test the battery life. As you can see I have only 3% lost in idle for the 17 hours and I still have the performance gains.
[Galaxy Tab S General] MrVaglna:
Thank you for testing. Somethings seems wrong than with mine. I've noticed that Deathly Aud shows Battery Cap of 30XX mAh, is this a bug? Btw even though iam running [MENTION=2427426]1800[/MENTION]mhz with -138mV 1.050 stable and getting around 52 GIPS, my other results in PCmark are far from yours.

One last question, you mentioned lowering the resolution - what app did you use for that? Ive tried with easy dpi changer, and whenever i try to lower the resoltion it crops the screen. What specific resolution you choose (dpi?)

thanks
[Galaxy Tab S General] Uranya:
Great Job

Dear friend,

finding your post have been a miracle for us!

Your mod have just saved our old, lazy an slow tablet...

It now has becoming to live its second life!

We have only used the CPU Core control function at 1600, and it goes to 1200 after 2 minutes, and do not throttle down even after 5 minutes at 100% CPU usage.

The only issue I have found is that Accubattery is now unable to work properly because of "Charging calibration failure", it is unable to measure the charging values.

Can you help us to find why?

By the way, this is a minor issue...

YOU HAVE REVIVED OUR T-805 Tablet, and We will be forever GRATEFUL to you!

Love and Light!
[Galaxy Tab S General] lefti696:
good job. I think that Samsung separated cpu and back cover on purpose. It reminds me of deforming back cover issue - https://pocketnow.com/galaxy-tab-s-overheating
[Galaxy Tab S General] MrVaglna:
Can someone do me a favour and do the pcmark battery test? It takes quite some time but i want to compare my results. Thanks
[Galaxy Tab S General] MAD-dutchman-01:
Yeah and what is with the Neo picture? There is only one Neo dude.

I have been playing around with CPU frequencies as well and yes my tablet is running better and faster but I definitely noticed that it uses a lot more battery so you have to throttle down the minimum CPU speed to about 500 cuz otherwise your batteries just gone in no time
[Galaxy Tab S General] nauvho:
Charge controller must provide that information to accubattery, I'm not sure that the os build has this.
[Galaxy Tab S General] nauvho:
Here are my results with min frequency set to minimum, I think that the results are very good for 7 year old battery.
[Galaxy Tab S General] MrVaglna:
Thank you for your effort. Seems my battery works properly, but due to the high battery drain in sleep mode i have to investigate whats going on while the tablet should do nothing.
[Galaxy Tab S General] Eboshi Moriyama:
Thank you for this useful tricks. I applied the settings in deathly adiutor and... wow the tablet is very fast! It gaves my tablet a new life and the battery consumption seems to be normal. Ok
[Galaxy Tab S General] gottahavit:
So I revived my T700 last night and got it updated to LOS 14.1 Deathly and decided I'd try this. Interestingly enough running the cpu throttle test my tab runs at 1.9ghz for a couple seconds then stabalizes at 1.6(with occasional dips to 1.4) and I get a peak 56Kgips with an 49Kgips average. I tried the undervolt change and setting max cpu to 1.6 and yes it's ever so slightly more stable at 1.6, but my average stays about the same and obviously no initial spike. Also my 3d Mark tests stay within a couple points no matter they change. This seems like the proper design as you want to be able to have short bursts of fast processing(app launching) then leveling off as fast as the cpu can sustain.

I'm actually going to do some more tweaking, to see what I can get out of it, but more to see if I can stabalize at 1700 or higher and have a 2.1ghz ceiling. Seems maybe the T800 or maybe individual devices have severely flawed heat dissipation.
[Galaxy Tab S General] hinaruu:
can i use thermal paste instead of pads, i dont have a thermal pads
[Galaxy Tab S General] Nash123:
My T805 seems ok. 48,33kgips average without any hardware changes. Even voltage was set at the recommended value. Using LOS for years and never experienced any performance issues. But good to know what to do if thermal problems should arise. Thanks OP!
[Galaxy Tab S General] Ceriwoll:
Hello

Can you reupload the build 10.26.2019 lineage os T-805 to googledrive or mega?

Because link in the 1st page dont contain that build anymore.

Kindly regards :)
[Galaxy Tab S General] Verdinex:
Any annoying bugs when it comes to LineageOS-14.1-Deathly? I'm considering it for my 8.4 LTE.
[Galaxy Tab S General] rihui:
I am using lineageOS daily on my 10.5 tab s. Everything i need works fine.

One or two games didnt run very well, but it is an old tablet.
[Galaxy Tab S General] Verdinex:
Is it possible to overclock Mali T628 with this ROM? I've heard it can go up to 600MHz, but samsung limited it to 533MHz. I feel like this tablet has pretty powerful CPU, but the GPU's performance is lackluster in comparison to Andreno 330 that comes with Snapdragon 800.
[Galaxy Tab S General] NeonHD:
I know that his words were put very harshly, but admittedly he has a point. This thread is purely about maximizing performance through hard and soft modding. It's not about Lineage ROMs.

---------- Post added at 12:25 PM ---------- Previous post was at 12:24 PM ----------

I actually overclocked it to 600mhz, because why not :p

---------- Post added at 12:51 PM ---------- Previous post was at 12:25 PM ----------

And the best part is that you don't have to use the minimum frequency all the time. If you're out on a road trip and you need extra battery life, then just underclock it. If you're at home and you want to play a game on your Tab, then overclock the h3ll outta it (within a reasonable range of course).

This is exactly why I love performance tweaking, everything is changeable according to your needs :)
[Galaxy Tab S General] randomGaymer68:
Amazing stuff. Helped me a lot.
[Galaxy Tab S General] andycar1992:
Thank You

Great Mod, The SM-T800 has been my go to device for years..The MOD has brought new life to this tablet..It's great that you posted this MOD for others to try out...

Just a note, I applied a thicker thermal pad to the CPU section (1mm thick) and I noticed after a few days my wifi signal was about half of what i used to be.. I think the thermal pad I used was to thick and it lifted the contacts off the back case where I believe the wifi antenna it located. I just used a .5mm thermal pad and my wifi signal is great know. If i'm mistaken about the wifi connector location please let me know.

Take care.