[MOD] Thermal mod of T805/T800 boost performance by 150%

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Thank you.
So what are the best settings for maximum power and maximum battery life:)
I'm using the LineageOS 17.1 rom, it doesn't have a lot of adjustments (no Deathly kernel). I just ramp up the cpu clock to 1700MHz when screen is on and down to minimum when off.

I think there are more customisations in this thread somewhere
 

Bigdrago

Senior Member
Jun 28, 2010
135
5
Interesting.
Ny cpu has maximum 1.8ghz.
When setting limit to 1.5 and undervoltage to 1012mV (-25) the temp reaches 85C after a while. But if I press just below the camera the temperature falls.
Guess I have to open it up and apply some thermal pad or glue some cooper.
Should I use the same thickness 0.5mm everywhere and just build layers if its not enough?
 

Bigdrago

Senior Member
Jun 28, 2010
135
5
Dear nauvho & kekerosberg,

thx a lot for your replies and help.
Based on your recommendations and cost considerations, I plan now to order and apply the following:
- 1x [Alphacool] 1MM Wärmeleitpad (thermal pad) 20x20mm "Eisschicht" 17W/mk on CPU
- 3x [Alphacool] 0,5MM Wärmeleitpad (thermal pad) ~15x15mm (custom cut) "Eisschicht" 17W/mk on other areas as per your picture

All together is about 22€ on ebay incl. shipment. So worth a trial for me.

Will see how that works out!

Kind regards, Oliver

Why use thicker on cpu and thinner on other areas? Wont that just create gaps?
 

Bigdrago

Senior Member
Jun 28, 2010
135
5
Added 0.3mm copper to connect all heatsinks and 1mm thermal pads (ec360 gold 14.5 W/mk). And 1mm pad in the deep area on the rear cover that connects to the cpu.

4478 score on work 2.0 pcmark (2.0.3716), had to download it manually from their website.
771 on slingshot (3dmark 2.2.4801)
 

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ID000001

Member
Apr 4, 2015
26
3
Samsung Galaxy Tab S
Just wanted to remark that after overclocking, this tablet is somehow still relevant and fully usable after 7+ years. I am getting around 4200 on work 3.0, not sure how to compare to 2.0 but it appears very snappy

I basically just added thermal tape at the back with what I have lying around, then set graphic to always and set CPU to 1500 min with deadly adiutor.
 

pucci2

Member
Jan 15, 2018
15
0
I own the 805, with lineage 17, I would like to understand if I put the thermal pad as explained without touching the various values already set, voltages etc., do I still get benefits in terms of fluidity?
 

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  • 16
    I have this tabled for a long time, but as i rarely used it i didn't bother with it much. From day one back in 2014 the tablet was sluggish and laggy, today is just unbearable even for browsing. So i have decided to take a look of what can i do.

    I have installed the latest (10.26.2019) LineageOS-14.1-Deathly with gapps nano.
    I have installed CPU Throttling Test from the play store and start testing to see what's going on. I saw that the CPU Throttle instantly (like in 10-15 sec max) from 1900mhz to 600mhz, and this is where the sluggishness comes from, the CPU is constantly throttled no matter that you are just looking at a simple web page.

    I started playing with the Deathly Adiutor and under-voltage the cpu, set the max to 1400mhz and this is where it is stable as it is. At 1400mhz constant 100% CPU stress the CPU temps are around 90c (at 95 the cpu starts throttling). Anything above 1400mhz even with under voltages CPU results in throttling within 1-2 min, but even like that at 1400mhz and GPU set to be always used and at minimum of 480mhz (with setting in dev options to always use gpu for 2d composition) the performance was really much much better then the stock settings.

    I have continued to play with it and noticed that if i apply pressure with my fingers on the back panel just below the camera where is the most hottest, the temps are dropping 10-15C, so i have opened it and i saw the issue.
    The issue is that the metal shield radiators does not make a good contact with the thermal pad on the back panel, and thus can't dissipate the heat well. This may variety from user to user as some back panels will make better or worse contact, but its far from ideal.
    Its good that i have some spare thermal pads around and i have applied them, and the result is perfect, drop in 12-17Cfrom stock setup under continues stress.

    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.

    Furthermore, i made an video to see how it runs and the settings i use.

    https://youtu.be/_UJdjPDQB00

    I'm attaching before and after the mod photos.
    3
    how's your battery life with minimum CPU speed at 1600

    Screen on & Standby time?

    Its not the minimum CPU frequency that gives you the performance boost, its the maximum frequency limit at 1600mhz down from 1900mhz, as i explained, to gain the performance, you need to avoid CPU from overheating and throttle down itself to the ground. That's why the max frequency with the thermal pads and improved thermals is 300mhz below the stock 1900mhz, and without the pads my max stable frequency were 1400mhz (500mhz below stock).

    The minimum frequency will only smooth out initial animations and things like that, but don't have much of an impact on the overall performance. With that said, increasing the minimum frequency ofc will eat more battery and you don't need it, you can safely set it to 650mhz (as low as it allows) and depending on your kernel governor policy should have the same or better battery life. As i said, the main gainer is preventing the CPU from overheating at 1900mhz and throttle down to 650mhz where it sits most of the time with stock settings.

    In fact if you limit your max frequency to 1400 or 1600mhz depending on your stable thermal results, and set minimum to 650mhz, you will see the performance gain AND significantly increased battery life due to that CPU does not go to 1900mhz and does not eat that much power and voltage. You really need to fine tune it depending on your needs, but at stock CPU throttling down to 650mhz and staying there is an manufacturer (Samsung) failure, and if i were discovered this when i bought it, i would wanted refund, as they advertise 1900mhz CPU which almost never works at that frequency.

    I tested this method on other tablets and phones, and while it happens on other devices to throttle down after 5-7 mins (not after 15 sec), i have never seen to throttle more then down to 80% of the advertised frequency, but the Tab S goes almost immediately down to 35% where it stays and cripple the device. Its really really bad engineering from Samsung.
    2
    Quick followup, i have run 3D Mark benchmark and PCmark, see the screenshots below. Managed to achieve the world fastest Tab S, enjoy :cool:
    2
    Awesome.. I followed ur recommendations and set 1087mv at 1600mhz and its fasttttt

    Thanks mate. I'm glad it helps :cool: According to 3DMark, the performance now is slightly better then Galaxy Tab A 2019, it really bring new life to this tablet and its ready to rock another couple of years ;)
    2
    What thickness of thermal pad should I buy? Probably will buy from Amazon unless I need to make a trip to Microcenter. Thanks for this suggestion @nauvho

    Well as you can see on the picture, the CPU bed already has one black pad by Samsung by default which is around 0.2/0.3mm i think, but it does not make contact, so i put on the CPU radiator 1mm pad and on the other radiators i put 0.5mm to equalize in case my pad is too thick. Your guide should be how easy is to close the back-plate, if you need too much force you may need thinner. So i guess you can take 0.3, 0.5 and 1mm pads.