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Old 2011-10-14, 16:46   #1
dabaichi
 
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Default Will running prime95 for long time harm CPU?

If I run Prime95 for 20 hours everyday, and the temperture of CPU is around 68 degree Celsius, in the long run, to what extent will that affect my CPU? (for laptop)

Also campared with not running Prime95, how much more electricity will the computer cost?

Thanks!
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Old 2011-10-14, 17:10   #2
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What is the CPU? As I understand it, Intel chips are more tolerant of higher temps. In contrast, according to this
http://www.overclockers.com/forums/s...d.php?t=596023
PhenomII Thuban chips get very unhappy at about 55C. 68C seems pretty warm, but this is a laptop. I think maybe an Intel CPU would be throttling itself at that temp.

I know I haven't answered your question, but I just don't know about long term, high temp effects on the CPU. Cooler would always seem to be better.

I can't really guess about power consumption. I am curious about this in my own situation, especially since I added GPU computing to the rig. One of these days I might get a Kill-a-Watt and do some testing.
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Old 2011-10-14, 20:44   #3
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Quote:
Originally Posted by kladner View Post
What is the CPU? As I understand it, Intel chips are more tolerant of higher temps. In contrast, according to this
http://www.overclockers.com/forums/s...d.php?t=596023
PhenomII Thuban chips get very unhappy at about 55C. 68C seems pretty warm, but this is a laptop. I think maybe an Intel CPU would be throttling itself at that temp.

I know I haven't answered your question, but I just don't know about long term, high temp effects on the CPU. Cooler would always seem to be better.

I can't really guess about power consumption. I am curious about this in my own situation, especially since I added GPU computing to the rig. One of these days I might get a Kill-a-Watt and do some testing.
Thank you for your reply! My CPU is Intel Core i3 M 370 @ 2.40GHz.
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Old 2011-10-14, 21:02   #4
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As far as I know, as long as it's not overheating, it will just shorten the lifespan of the processor, "age it faster" so to speak. I don't know any numbers for life or power, sorry
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Old 2011-10-14, 21:45   #5
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Here is a discussion thread from Tom's Hardware which tosses various numbers around. Some are saying that i3's start throttling at 100C or 105C. I do note that these discussions are not about Mobile versions. These a not official Intel data, just users.

http://www.tomshardware.com/forum/28...ore-temps-core

This thread concerns a mobile version of a different model than yours:

http://www.tomshardware.com/forum/60...0m-temperature

And here is what Intel puts in its specifications for your chip:

http://ark.intel.com/products/49020/...he-2_40-GHz%29

It shows:

TJUNCTION
90°C for rPGA, 105°C for BGA
In further reading it was asserted that at 105C the CPU will shut down. This leads back to what I said that 68C seems a bit warm. But this seems to indicate that it is not extremely dangerous. You might try getting the laptop a little more space underneath so it might get more air, or get a notebook cooler pad for it.

Hope this helps a bit.

Last fiddled with by kladner on 2011-10-14 at 21:45
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Old 2011-10-14, 21:59   #6
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Thank you so much!
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Old 2011-10-14, 22:34   #7
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It's probably worth thinking about the temperature of all the other chips in your laptop....since the death of any of them will kill your laptop just as surely as the death of the CPU....
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Old 2011-10-14, 23:49   #8
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For my chip, Intel just has
Code:
TCASE	72.6°C
What does that mean?
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Old 2011-10-15, 00:00   #9
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Quote:
Originally Posted by Christenson View Post
It's probably worth thinking about the temperature of all the other chips in your laptop....since the death of any of them will kill your laptop just as surely as the death of the CPU....
Thank you for your reminding! The temperature of harddisk is 37 C, and motherboard is 59 C. Will this be a problem as well?
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Old 2011-10-15, 04:02   #10
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I don't think 37C is any problem for a HDD. It's not bad under the circumstances. The hottest drive in my case (2TB WD Black) is running at 36C right now on a cool evening, and it has lots more air moving over it in a tower than in your notebook. I can't really say about the motherboard reading. It doesn't seem out of proportion to the other temps you've given, but we don't know exactly what it is reading.

If you are concerned, I would urge making sure there's room around the vents in the case for air to flow. Make sure the vents are clean, too. I would hope though, that a notebook would be designed to withstand fairly warm operation, given their tight spaces. But maybe they don't design for Prime95 kind of demands. I am not comfortable with the temps that P95 causes on my friend's i7 920 with the stock cooler. I know i7s are more heat resistant than PhenomII's. But seeing it go past 70C makes me nervous.

EDIT: As Christenson said, there are lots of other chips providing heat in there. A cooler pad might be a good idea if you want to run P95 all the time.

Last fiddled with by kladner on 2011-10-15 at 04:09
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Old 2011-10-15, 06:24   #11
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My i7-2600k runs around 80C with the stock cooler, 3.6 GHz, three cores P95 one core mfaktc. That's why I'm wondering what the Intel number I saw is.
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