Relationship between WU and CPU?

**Glaswegian** · 01-30-2008, 12:24 PM

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.

JohnthePilot · 01-30-2008, 01:30 PM

Or try lapping them.

DonaldG · 01-30-2008, 01:40 PM

If he dances whist doing so, would he be Lap Dancing?

**Glaswegian** · 01-30-2008, 01:53 PM

Hey, I'm not eneles you know...

**Deleted090308** · 01-30-2008, 04:05 PM

Quote:

Originally Posted by Glaswegian

Hey, I'm not eneles you know...

What???

I'll have you tap dancing, tenderfoot.

JohnthePilot · 01-30-2008, 04:21 PM

And in the Red corner...

**Glaswegian** · 01-31-2008, 06:35 AM

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...

JohnthePilot · 01-31-2008, 08:06 AM

Sorry Glas.

EDIT: Why do Pot, Kettle and Black spring to mind?

DonaldG · 01-31-2008, 11:26 AM

Quote:

Originally Posted by Glaswegian

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

**kodi** · 01-31-2008, 11:49 AM

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

**Glaswegian** · 01-31-2008, 01:00 PM

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.

**grumpygit** · 01-31-2008, 01:07 PM

Ive noticed my temps vary depending on which core the WU is running. Amber cores seem to push my temps higher.

ebackhus · 01-31-2008, 02:16 PM

I haven't really noticed any temperature changes when running the various core types... Maybe I'm just ignorant.

**Glaswegian** · 01-31-2008, 02:59 PM

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

EB - you'll need to pay more attention...

**mattlock** · 01-31-2008, 09:25 PM

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°)

**Glaswegian** · 02-01-2008, 06:23 AM

Matt - thanks for the sensible answer and clear explanation.

**mattlock** · 02-01-2008, 09:04 AM

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

01-30-2008, 12:24 PM	#1 (permalink)
Glaswegian Moderator/ Rangemaster TSF Academy; Analyst, Security Team; Oor Wullie; TSF Surgeon and Resident Comic Join Date: Sep 2005 Location: Glasgow Posts: 25,186 OS: Win XP Pro SP3 / Win 7 Pro My System Blog Entries: 10	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. __________________ Iain - Defender of the Haggis and all things Scottish. I don't help by PM - post in the Forums. PC Safety & Security::PC running a bit slow?::Donate::Photographers Corner

01-30-2008, 01:30 PM	#2 (permalink)
JohnthePilot Manager, TSF Articles Join Date: Mar 2006 Location: Cheltenham, near Wales. Posts: 30,785 OS: XP Home SP3, PCLinux, Vista Home Premium SP1 My System Blog Entries: 1	Re: Relationship between WU and CPU? Or try lapping them. __________________ Submit New Articles Here If you feel that TSF has helped you please make a donationand help to keep the forum free Cenedl heb iaith, cenedl heb galon Folding@Home - Team 85015

01-30-2008, 01:40 PM	#3 (permalink)
DonaldG Manager Home Support, Assistant Manager Articles Team Join Date: Aug 2007 Location: Somerset, UK Posts: 10,032 OS: XPsp2 Laptop & Vista Ultimate Desktop My System Blog Entries: 1	Re: Relationship between WU and CPU? If he dances whist doing so, would he be Lap Dancing? __________________ . Lest we forget... "They shall grow not old, as we that are left grow old; Age shall not weary them, nor the years condemn. At the going down of the sun and in the morning We will remember them." Submit New Articles Here TSF's Photographer's Corner .

01-30-2008, 01:53 PM	#4 (permalink)
Glaswegian Moderator/ Rangemaster TSF Academy; Analyst, Security Team; Oor Wullie; TSF Surgeon and Resident Comic Join Date: Sep 2005 Location: Glasgow Posts: 25,186 OS: Win XP Pro SP3 / Win 7 Pro My System Blog Entries: 10	Re: Relationship between WU and CPU? Hey, I'm not eneles you know... __________________ Iain - Defender of the Haggis and all things Scottish. I don't help by PM - post in the Forums. PC Safety & Security::PC running a bit slow?::Donate::Photographers Corner

01-30-2008, 04:21 PM	#6 (permalink)
JohnthePilot Manager, TSF Articles Join Date: Mar 2006 Location: Cheltenham, near Wales. Posts: 30,785 OS: XP Home SP3, PCLinux, Vista Home Premium SP1 My System Blog Entries: 1	Re: Relationship between WU and CPU? And in the Red corner... __________________ Submit New Articles Here If you feel that TSF has helped you please make a donationand help to keep the forum free Cenedl heb iaith, cenedl heb galon Folding@Home - Team 85015

01-31-2008, 06:35 AM	#7 (permalink)
Glaswegian Moderator/ Rangemaster TSF Academy; Analyst, Security Team; Oor Wullie; TSF Surgeon and Resident Comic Join Date: Sep 2005 Location: Glasgow Posts: 25,186 OS: Win XP Pro SP3 / Win 7 Pro My System Blog Entries: 10	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... __________________ Iain - Defender of the Haggis and all things Scottish. I don't help by PM - post in the Forums. PC Safety & Security::PC running a bit slow?::Donate::Photographers Corner

01-31-2008, 08:06 AM	#8 (permalink)
JohnthePilot Manager, TSF Articles Join Date: Mar 2006 Location: Cheltenham, near Wales. Posts: 30,785 OS: XP Home SP3, PCLinux, Vista Home Premium SP1 My System Blog Entries: 1	Re: Relationship between WU and CPU? Sorry Glas. EDIT: Why do Pot, Kettle and Black spring to mind? __________________ Submit New Articles Here If you feel that TSF has helped you please make a donationand help to keep the forum free Cenedl heb iaith, cenedl heb galon Folding@Home - Team 85015 Last edited by JohnthePilot; 01-31-2008 at 08:10 AM.

01-31-2008, 11:49 AM	#10 (permalink)
kodi Moderator Hardware Team Join Date: Jun 2004 Location: Sydney Australia Posts: 7,376 OS: Windows 7-Ultimate 64 Bit My System	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 __________________ Brian

01-31-2008, 01:00 PM	#11 (permalink)
Glaswegian Moderator/ Rangemaster TSF Academy; Analyst, Security Team; Oor Wullie; TSF Surgeon and Resident Comic Join Date: Sep 2005 Location: Glasgow Posts: 25,186 OS: Win XP Pro SP3 / Win 7 Pro My System Blog Entries: 10	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. __________________ Iain - Defender of the Haggis and all things Scottish. I don't help by PM - post in the Forums. PC Safety & Security::PC running a bit slow?::Donate::Photographers Corner

01-31-2008, 01:07 PM	#12 (permalink)
grumpygit T-Shirt Winner Join Date: Oct 2006 Location: hertford, england Posts: 4,716 OS: win xp pro sp3 My System Blog Entries: 2	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. __________________ Grumpygit

01-31-2008, 02:16 PM	#13 (permalink)
ebackhus Manager, Design Join Date: Apr 2005 Location: SATX Posts: 14,146 OS: WinXP Pro SP3/Windows 7 RTM My System Blog Entries: 28	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. __________________ ----------------------------- There are no dumb questions, unless a customer is asking them. Help in the fight against cancer and other serious illnesses.

01-31-2008, 02:59 PM	#14 (permalink)
Glaswegian Moderator/ Rangemaster TSF Academy; Analyst, Security Team; Oor Wullie; TSF Surgeon and Resident Comic Join Date: Sep 2005 Location: Glasgow Posts: 25,186 OS: Win XP Pro SP3 / Win 7 Pro My System Blog Entries: 10	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... __________________ Iain - Defender of the Haggis and all things Scottish. I don't help by PM - post in the Forums. PC Safety & Security::PC running a bit slow?::Donate::Photographers Corner

01-31-2008, 09:25 PM	#15 (permalink)
mattlock Mentor Hardware Team Join Date: Dec 2005 Location: Ohio Posts: 4,183 OS: XP SP2, Win 7 Beta, Win 7 RC My System	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°) __________________ Matt Everest-Thermal Paste Instruction-Power Supply Info-Sensorview PSU Calculator-Speedfan-Bench Test Help TSF Fight Disease. It's Free! Last edited by mattlock; 01-31-2008 at 09:48 PM.

02-01-2008, 06:23 AM	#16 (permalink)
Glaswegian Moderator/ Rangemaster TSF Academy; Analyst, Security Team; Oor Wullie; TSF Surgeon and Resident Comic Join Date: Sep 2005 Location: Glasgow Posts: 25,186 OS: Win XP Pro SP3 / Win 7 Pro My System Blog Entries: 10	Re: Relationship between WU and CPU? Matt - thanks for the sensible answer and clear explanation. __________________ Iain - Defender of the Haggis and all things Scottish. I don't help by PM - post in the Forums. PC Safety & Security::PC running a bit slow?::Donate::Photographers Corner

02-01-2008, 09:04 AM	#17 (permalink)
mattlock Mentor Hardware Team Join Date: Dec 2005 Location: Ohio Posts: 4,183 OS: XP SP2, Win 7 Beta, Win 7 RC My System	Re: Relationship between WU and CPU? You're welcome Glas. Now everyone can get back to thier lap dances. __________________ Matt Everest-Thermal Paste Instruction-Power Supply Info-Sensorview PSU Calculator-Speedfan-Bench Test Help TSF Fight Disease. It's Free!