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Old 01-30-2008, 12:24 PM   #1 (permalink)
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Relationship between WU and CPU?

Kind of going over old ground a bit here, but I thought it best to start a new thread.

On my last WU (just finished) my core temps were generally around 50/51C, and whilst that was reckoned to be on the high side, it was not dangerously so. My new WU has, for the last 90 minutes shown temps between 43C and 48C, using CoreTemp. PC Wizard confirms these temps.

I was wondering if each WU requires different effort from the CPU, thus causing such temp variations? Are future WUs likely to show such variations? Naturally, I'm pleased that the temps have dropped a few degrees, as it was my intention to move a couple of the Antec fans to the high setting (all are on medium) at the weekend.
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Old 01-30-2008, 01:30 PM   #2 (permalink)
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Re: Relationship between WU and CPU?

Or try lapping them.
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Old 01-30-2008, 01:40 PM   #3 (permalink)
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Re: Relationship between WU and CPU?

If he dances whist doing so, would he be Lap Dancing?
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Old 01-30-2008, 01:53 PM   #4 (permalink)
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Re: Relationship between WU and CPU?

Hey, I'm not eneles you know...
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Old 01-30-2008, 04:05 PM   #5 (permalink)
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Re: Relationship between WU and CPU?

Quote:
Originally Posted by Glaswegian View Post
Hey, I'm not eneles you know...
What???
I'll have you tap dancing, tenderfoot.
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Old 01-30-2008, 04:21 PM   #6 (permalink)
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Re: Relationship between WU and CPU?

And in the Red corner...
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Old 01-31-2008, 06:35 AM   #7 (permalink)
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Re: Relationship between WU and CPU?

I don't suppose there's any chance of a reasonably sensible answer? I may have to delete some posts to put this thread back on track...
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Old 01-31-2008, 08:06 AM   #8 (permalink)
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Re: Relationship between WU and CPU?

Sorry Glas.

EDIT: Why do Pot, Kettle and Black spring to mind?
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Old 01-31-2008, 11:26 AM   #9 (permalink)
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Re: Relationship between WU and CPU?

Quote:
Originally Posted by Glaswegian View Post
Kind of going over old ground a bit here, but I thought it best to start a new thread.

On my last WU (just finished) my core temps were generally around 50/51C, and whilst that was reckoned to be on the high side, it was not dangerously so. My new WU has, for the last 90 minutes shown temps between 43C and 48C, using CoreTemp. PC Wizard confirms these temps.

I was wondering if each WU requires different effort from the CPU, thus causing such temp variations? Are future WUs likely to show such variations? Naturally, I'm pleased that the temps have dropped a few degrees, as it was my intention to move a couple of the Antec fans to the high setting (all are on medium) at the weekend.
Trying to help get it on the right track again...Iain.

I don't know about WU giving differing stresses on the CPU to give differing temperatures. That said, I am currently investigating CPU temperatures and factors affecting same coupled with heat removal.

Forgive me if this is 'old hat' with you: I don't know if you have considered the possibility of varying room temperatures or something else changing the air flow into/out of the computer?

If the room temperature varies, then there will be a different temperature noticed at the CPU cores. Other factors that could introduce a difference are thermal eddies (like mini whirlwinds) inside the case. These eddies could change and cause cold or hot spots inside the case. factors that could affect the eddies is a change in the airflow into the machine or out. IE a book or something near the inlet and/or exhausts will change things...

... Just a thought
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Last edited by DonaldG; 01-31-2008 at 11:29 AM.
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Old 01-31-2008, 11:49 AM   #10 (permalink)
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Re: Relationship between WU and CPU?

Room temps will affect your CPU temp.
Yesterday it was 32c and my CPU was 51-52c.
This morning it's 20c and my CPU is 41c
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Old 01-31-2008, 01:00 PM   #11 (permalink)
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Re: Relationship between WU and CPU?

OK, I understand that, but I can't sit in this room without the central heating on...at least not in February...in Scotland.

I don't think it's anything to be concerned about - the temps are pretty stable - I was just curious if the type of WU required more/less processor effort.
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Old 01-31-2008, 01:07 PM   #12 (permalink)
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Re: Relationship between WU and CPU?

Ive noticed my temps vary depending on which core the WU is running. Amber cores seem to push my temps higher.
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Old 01-31-2008, 02:16 PM   #13 (permalink)
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Re: Relationship between WU and CPU?

I haven't really noticed any temperature changes when running the various core types... Maybe I'm just ignorant.
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Old 01-31-2008, 02:59 PM   #14 (permalink)
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Re: Relationship between WU and CPU?

Thanks GG - that's the sort of thing I'm talking about.

EB - you'll need to pay more attention...
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Old 01-31-2008, 09:25 PM   #15 (permalink)
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Re: Relationship between WU and CPU?

The SMP client only runs Gromac core.

I notice slight temp variations (as much as 5°c), but I think in my case it's due to having the priority of the VMware process set to "Low". So if I start another app the CPU usage of VMware (which is what I'm folding on) drops briefly, which results in the temp drop. I don't know if the same thing would occur with the Windows client.

CPU temps change fairly rapid in relationship to the load. Also the DTS that reports the actual core temp is more sensetive to temp/load changes than the IHS thermal diode. So you will see more temp fluctuation in the actual core temp than the CPU temp that is read in the BIOS, or with say Sensorview. I can watch my CPU usage bounce between 90-97% and the Core Temp reading moves right along with it by a couple degrees (50-52°), but the Sensorview CPU temp will only move from slightly ever minute or so. (47-48°)

Last edited by mattlock; 01-31-2008 at 09:48 PM.
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Old 02-01-2008, 06:23 AM   #16 (permalink)
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Re: Relationship between WU and CPU?

Matt - thanks for the sensible answer and clear explanation.
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Old 02-01-2008, 09:04 AM   #17 (permalink)
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Re: Relationship between WU and CPU?

You're welcome Glas. Now everyone can get back to thier lap dances.
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