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Falconet
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Tablet Temperatures

I bought a Lenovo Miix 2 8" from Ebay a couple of weeks ago. It has a quad Intel Z3740 CPU, Windows 8.1 32-bit and 2 GB of RAM.

I had to buy a charger that was compatible with the PT (and EU) socket so that it could keep the battery charged while crunching.

The CPU runs all 4 cores at 1.86 Ghz and UGM tasks seem to take about 7 hours. It is currently running 4 of them which are at 50% after 3 hours and 28 minutes of CPU time.

Slower than my desktops (usually take 3-4.5 hours for UGM) but a lot more efficient - with a blank display it is currently using 6.5-7 watts (my desktops take 84-90 watts)

However the temps of the cores are at 60-67º celsius. Intel says the max temp is 90º celsius.

I just want to know if these temps are too high for the tablet. I won't be running it 24/7, just some 6-7 hours per day.

Also, the battery, will it have any significant effect for it to be running from the charger and with the battery at 100%?
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AMD Ryzen 5 1600AF 6C/12T 3.2 GHz - 85W
AMD Ryzen 5 2500U 4C/8T 2.0 GHz - 28W
AMD Ryzen 7 7730U 8C/16T 3.0 GHz
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[Edit 1 times, last edit by Falconet at Dec 19, 2014 8:24:11 PM]
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Re: Tablet Temperatures

Also, the battery, will it have any significant effect for it to be running from the charger and with the battery at 100%?


I'm not a techie, but I've always heard that if you run a laptop plugged in continuously, the battery should be removed. Is this true?
[Dec 19, 2014 8:56:18 PM]   Link   Report threatening or abusive post: please login first  Go to top 
Falconet
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Re: Tablet Temperatures

But this isn't a laptop. I can't remove the battery.
Also, I never removed the battery on my laptop and the battery still lasts around 2 hours and 30 minutes.
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AMD Ryzen 5 1600AF 6C/12T 3.2 GHz - 85W
AMD Ryzen 5 2500U 4C/8T 2.0 GHz - 28W
AMD Ryzen 7 7730U 8C/16T 3.0 GHz
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noderaser
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Re: Tablet Temperatures

The CPU should be fine, but it's pretty hard to say what else is in there component-wise without looking at a tear-down. Even though Atoms are really efficient and don't produce a lot of heat, it can be enough to do some damage to less sturdy components. Because they're all packed in so tightly, you will get a lot of heat transfer between components, and most tablets probably don't have a very well designed cooling solution because most users wouldn't stress it much.

From running BOINC on my phone, I think the battery is a likely item to take a hit, they don't like the heat and will lose capacity after a while.
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Falconet
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Re: Tablet Temperatures

noderaser,

Thanks. I guess I am going to run it 5 hours per day but pause BOINC and remove the charger in-between and see what happens.

Thanks
----------------------------------------


AMD Ryzen 5 1600AF 6C/12T 3.2 GHz - 85W
AMD Ryzen 5 2500U 4C/8T 2.0 GHz - 28W
AMD Ryzen 7 7730U 8C/16T 3.0 GHz
----------------------------------------
[Edit 1 times, last edit by Falconet at Dec 20, 2014 10:14:35 AM]
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Falconet
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Re: Tablet Temperatures

Okey, I lowered the number of cores to 3.

This way the cores run at no more than 55º rather than those 65º with 4 cores. Altough today it has been turned on for 8 hours and the temps never went above 63º.

With 3 cores, each task runs faster too :)
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AMD Ryzen 5 1600AF 6C/12T 3.2 GHz - 85W
AMD Ryzen 5 2500U 4C/8T 2.0 GHz - 28W
AMD Ryzen 7 7730U 8C/16T 3.0 GHz
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Re: Tablet Temperatures

Have it standing on the edge, leaning between two widely spaced books, instead of laying down. It will cool better. Find out where the CPU is and then have that side furthest down so that the warm air can circulate inside, instead of pooling around the processor, which it will if you have the CPU on top. This is true only if it doesn't have any air vents. If it has air vents then the right solution is opposite to what I wrote now.

The SSD can also be worn out, so stay away from CEP2.


Some have reported discolored screens:

https://secure.worldcommunitygrid.org/forums/...ad,36937_offset,20#475781

If I were you I would only use two cores, so to be on the safe side. 55C could be too hot for a thin tablet, but I might be wrong.
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enels
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Re: Tablet Temperatures

Falconet,

I have an ASUS T1100ta with a Z3740 that has been running 100% 24/7 for 6 months. It gets slightly warm in one corner. You may try finding the hot spot and make sure that it isn't covered. Mine uses 4 watts running MCM and FA@H and 5 running UGM1. UGM1 generates about 33% more points than MCM or FA@H. Mine also seems to run at full turbo of 1.8 GHz. Despite what it is doing.

My charger is the lower of those mentioned in the manual. But it can charge while crunching. The only way to tell I guess is try it out. Mine is almost always plugged in.

This leads me to a setting I would like to see. My devices seem to know when they are plugged in and not charging. I would like my devices to charge first, and then start crunching after charging is complete.

Good luck
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Re: Tablet Temperatures

Enels, your tablet is 10", his is only 8". This means that there is less air inside his that can absorb the heat before it radiates through the casing. He will push his luck if he runs all four like you.

Here is a chart for: "The Intel Core M/Broadwell-Y fanless sweet spot for 10mm, 8mm, 7mm tablets."

http://www.extremetech.com/wp-content/uploads...-m-fanless-sweet-spot.png

That's for 14nm but it's the same principal for 22nm, only different numbers. The smaller the surface, the thicker it must be in order to maintain the volume of internal air. If it has the same thickness and smaller surface, like Falconet's probably has, it will either have to have a lower TDP processor or some of the cores turned off, unless the processor manages to throttle the frequency on it's own. But it's important to remember what Intel's and tablet makers' intention is: having users engaging in brief activities that stress the processor for brief moments, not for hours and hours. The CPU can probably take it, but I don't think the motherboard capacitors will. At least not in the long run.

The Z3740 is an awesome processor when it comes to energy efficiency. Too bad Intel doesn't want to make a similar SoC desktop version, but with 8 cores and hyper threading. I would be all over it if they did. The closest they have seems to be C2750 (8 cores and no hyper threading). This summer, when I tried to decide how to proceed with my crunching, I seriously considered 8-10 of C2750, but I didn't know how to connect them all to one single PSU since they all need to regulate the PSU for their own power needs. I didn't think it would be possible to just daisy chain the motherboards to one PSU. Or is it?
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mali vuk
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Re: Tablet Temperatures

Hi,

I run 24/7/356 and my experience is following:
-PC machines no problem,
-Laptops: battery critical because of plugged in all the time. I burned atom/Asus 10˝ in one year. HP's laptops running ok with battery as I said.
-Tablet nexus7 3 years running on 3 cores works still ok. Battery also. I'm surprised.
-Samsung SIII 2 cores: battery dead after 1,5year,changed!

I think that if you have the machine you should run it under such pressure that machine will not wait to be replace because of age. It should help you with buying decision.
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