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rhendrix9
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 Posted: Wed Jul 02, 2014 1:13 pm Post subject: Change cpu for low heat |
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I have a Shuttle SG31G2 with a Q8400.
The pc puts out more heat... I want to use this pc for basic web surfing.
I am think of an E8600, it has a tdp of 65w vs 95w
would an E8200 provide roughly the same performance but generate lesw heat?
I like the 6m cache.
Is there something else I should consider?
Would taking(and leaving) the case cover off keep it from heating up the room? |
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mavroxur
Joined: 06 Jul 2005
Posts: 1192
Location: Wichita Falls, TX
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| Posted: Thu Jul 03, 2014 11:00 am Post subject: |
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| For web browsing and light tasks, two faster cores will feel faster than 4 slower cores. The E8600 is rocking very substantial clock advantage (2.66 vs 3.33), 6M of cache (vs 4M), and will probably feel a lot snappier for average use. It may lag behind in heavy multi threaded apps, but probably not by much, and will run a lot cooler. I wouldn't bother with a Q8200, as the TDP is the same. |
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agent_x007
Joined: 16 May 2014
Posts: 14
Location: Europe
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| Posted: Sat Jul 19, 2014 11:03 am Post subject: |
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| Just reduce Vcore for CPU (if MB has option for it). It's simple and easy way to decrease heat production. |
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mavroxur
Joined: 06 Jul 2005
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Location: Wichita Falls, TX
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| Posted: Sat Jul 19, 2014 3:51 pm Post subject: |
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| agent_x007 wrote: | | Just reduce Vcore for CPU (if MB has option for it). It's simple and easy way to decrease heat production. |
Also a simple way to reduce stability and increase Icc |
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Qwerty
Joined: 20 May 2005
Posts: 3141
Location: Germany
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| Posted: Sun Jul 20, 2014 12:39 am Post subject: |
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| mavroxur wrote: | | agent_x007 wrote: | | Just reduce Vcore for CPU (if MB has option for it). It's simple and easy way to decrease heat production. |
Also a simple way to reduce stability and increase Icc |
I don't agree. The so called "undervolting" could be very beneficial if done carefully. I reduced the voltage of the QX6800 in my computer in order to reduce the heat generation and power consumption. This CPU consumes 130 W by default, which is a lot of heat!
The most important thing about undervolting is that you must reduce the VCore in small steps and test the stability with Prime95 every time. It's the same approach as for overclocking.
At the end I was able to reduce the total power consumption of the system (CPU+motherboard) by 40W, without affecting the stability! |
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mavroxur
Joined: 06 Jul 2005
Posts: 1192
Location: Wichita Falls, TX
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| Posted: Sun Jul 20, 2014 9:52 am Post subject: |
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| Qwerty wrote: | | mavroxur wrote: | | agent_x007 wrote: | | Just reduce Vcore for CPU (if MB has option for it). It's simple and easy way to decrease heat production. |
Also a simple way to reduce stability and increase Icc |
I don't agree. The so called "undervolting" could be very beneficial if done carefully. I reduced the voltage of the QX6800 in my computer in order to reduce the heat generation and power consumption. This CPU consumes 130 W by default, which is a lot of heat!
The most important thing about undervolting is that you must reduce the VCore in small steps and test the stability with Prime95 every time. It's the same approach as for overclocking.
At the end I was able to reduce the total power consumption of the system (CPU+motherboard) by 40W, without affecting the stability! |
That is impressive, but not typical. |
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agent_x007
Joined: 16 May 2014
Posts: 14
Location: Europe
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| Posted: Mon Jul 21, 2014 3:38 pm Post subject: |
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It depends strongly how much power CPU usually uses and on stock VID (basicly all that "silicon lottery" stuff).
Reducing Vcore will reduce stability, but since all CPU's can be OC'ed on stock voltage, they can also be undervoltaged on stock clocks 
Of course how much depends on "silicon lottery", mentioned earlier.
I think, -0,1V on Vcore should be doable in most cases. OCCT/Prime95/LinX, can check if there are stability problems forming.
From experience : I got C2E X6800 that can go from 2,93GHz@~1,2V, to 2,2GHz@1,05V (can't go lower because BIOS doesn't have option for Vcore=1V or lower :p). It's 100% stable at 1,05V on that 2,2GHz.
Don't have to metion that cooler isn't as hot as on stock clocks  .
PS. But I don't get how lowering Vcore, can kill CPU (at least this old) ?
Can U explain it better ? |
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debs3759
Joined: 18 Jan 2006
Posts: 9477
Location: Northampton, Divided Kingdom
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| Posted: Mon Jul 21, 2014 4:19 pm Post subject: Re: Change cpu for low heat |
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| rhendrix9 wrote: | | Would taking(and leaving) the case cover off keep it from heating up the room? |
Everyone seems to have overlooked this question...
If you remove the cover, the CPU will still generate the same amount of heat. It may help keep the CPU temperature down, depending on how efficient your cooling system is (ie case fans, CPU heatsink/fan), but it will still be generating the same heat. It will just potentially transfer the heat away from the processor faster.
Also, making sure you blow dust out of the heatsink will help with cooling the processor, as a pile up of dust will reduce airflow throughout the cooler.
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debs3759
Joined: 18 Jan 2006
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Location: Northampton, Divided Kingdom
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| Posted: Mon Jul 21, 2014 4:24 pm Post subject: |
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| agent_x007 wrote: | From experience : I got C2E X6800 that can go from 2,93GHz@~1,2V, to 2,2GHz@1,05V (can't go lower because BIOS doesn't have option for Vcore=1V or lower :p). It's 100% stable at 1,05V on that 2,2GHz.
Don't have to metion that cooler isn't as hot as on stock clocks . |
It seems rather pointless to underclock a processor in most cases. Why not just buy a slower rated processor? That will generally use less power.
| Quote: | PS. But I don't get how lowering Vcore, can kill CPU (at least this old) ?
Can U explain it better ? |
Nobody suggested that undervolting can kill a processor. It was only said that if done without careful testing it could lead to the processor becoming unstable (the same as overclocking without raising voltages when needed). It is important when either reducing voltage or increasing clock speeds to do it in small increments, and test after each change to make sure the system is still stable. Not doing so could lead to the loss of data due to the system not being fully stable, and the possibility that the OS may lock up or some other instability may cause invalid data to be passed around the system.
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My graphics card database can be found at http://www.gpuzoo.com.
I can resist anything except temptation.
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agent_x007
Joined: 16 May 2014
Posts: 14
Location: Europe
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| Posted: Mon Jul 21, 2014 5:21 pm Post subject: |
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@up Why buy slower one, when I already had faster one ?
I can underclock/undervolt it for free and get same or better results (slower ones usually got less cache than faster ones)
+ I was checking something... LINK
As for killing CPU : Hmm... I thought that someone mentioned it... - had to imagine it (probably from that "Icc" voltage @mavroxur mentioned [what ever it is]), nevermind then :p |
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mavroxur
Joined: 06 Jul 2005
Posts: 1192
Location: Wichita Falls, TX
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| Posted: Mon Jul 21, 2014 10:02 pm Post subject: |
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Nobody suggested that undervolting can kill a processor. It was only said that if done without careful testing it could lead to the processor becoming unstable (the same as overclocking without raising voltages when needed). It is important when either reducing voltage or increasing clock speeds to do it in small increments, and test after each change to make sure the system is still stable. Not doing so could lead to the loss of data due to the system not being fully stable, and the possibility that the OS may lock up or some other instability may cause invalid data to be passed around the system. |
I mentioned that undervolting can increase Icc, which can cause (among other things) premature failure. |
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llissa374
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| Posted: Thu Oct 16, 2014 3:49 pm Post subject: |
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[quote="mavroxur"] | Quote: |
Nobody suggested that undervolting can kill a processor.
I mentioned that undervolting can increase Icc, which can cause (among other things) premature failure. |
Do you know, and if so would you share, the methodology by which reducing Vcc will cause Icc to increase? Or point to some reference. |
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