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Strange CPU Temps on E8400

post #1 of 10
Thread Starter 
I didn't want to make a new thread, but I searched high and low and could not find an answer. My stock E8400 with GA-P45-UD3P and Cooler Master 101 (80mm Push/Pull) setup idles at 38Cish on hot days, maxing out around 59C (Prime/IBT). As soon as I OC it even 100mhz (no voltage increase at all up to 3.6), temps shoot up to 50C idle and almost 80C max.

I've been overclocking for awhile now and have never seen such high increases in heat without any voltage increases. Anyone who's had a lot of experience with the E8400 (or probably any other Wolfdale) ever have this experience?
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post #2 of 10
Is the heatsink tightened down all the way? Or, are you able to wobble it with your hand?

It sounds to me like either it's too loose, or maybe there is not enough thermal paste.
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post #3 of 10
Is it a C0 stepping, by any chance?

My C0 stepping Core 2 Duo E8400 that I bought day one had big sensor issues. For one, the CPU would be any given temperature, and the first core would be ~9C-11C higher, and the second would be yet another ~10C higher (this was on an Arctic Cooling Freezer 7 Pro and the cooling I use now in my signature). Also, sometimes it'd say it'd get up near ~80C, but I touched the base of the heatpipes and they'd feel cooler than the heatpipe on my Northbridge, which was ~50C at the time.

In short, no way to be sure what was what, but the C0 stepping Wolfdale's seemingly had alot of sensor plaguing issues.

My current E0 stepping Core 2 Duo E8600 is fine though. The CPU and both cores sit at the exact temperature (assuming an even load), and idle and load predictably and reasonably.
post #4 of 10
It could also be a very hot running E8400 combined with just an average at best cooler (2 heatpipes/80mm).
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Samsung EVO 120GB Crucial M500 480GB WD10EZEX 1TB H100i 
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post #5 of 10
Thread Starter 
Quote:
Originally Posted by Princess Garnet View Post
Is it a C0 stepping, by any chance?
Just checked, it's an A stepping.

Quote:
Originally Posted by TwoCables View Post
Is the heatsink tightened down all the way? Or, are you able to wobble it with your hand?

It sounds to me like either it's too loose, or maybe there is not enough thermal paste.
So I reapplied thermal paste. I used a plastic card to spread it evenly over the heatsink, making sure to get into the heatpipe gaps, and a bit on the CPU as well. It was seated firmly.

Dropped temps quite a bit. On OC @ 3.6ghz it's 44C Idle and 81C max.

Quote:
Originally Posted by SyveRson View Post
It could also be a very hot running E8400 combined with just an average at best cooler (2 heatpipes/80mm).
Looks like this is probably the reason. Just weird to see such a huge increase in temp with no up in voltage.

Thanks for all the help guys.
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post #6 of 10
Quote:
Originally Posted by jimwest View Post
Just checked, it's an A stepping.
What's the Revision?

CPU-Z has it backwards for some reason (always has, too). The Revision in CPU-Z is the Stepping.

Is it C0 or E0 (those are zeros, not o's).


Quote:
Originally Posted by jimwest View Post
So I reapplied thermal paste. I used a plastic card to spread it evenly over the heatsink, making sure to get into the heatpipe gaps, and a bit on the CPU as well. It was seated firmly.

Dropped temps quite a bit. On OC @ 3.6ghz it's 44C Idle and 81C max.
Well, that's better but still hot.
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i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
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250 GB Samsung 840 EVO (OS) 3 TB Toshiba P300 (storage) Samsung SH-S243N 24x DVD Burner Samsung SH-S203N 20X DVD Burner 
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It's a computer!
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CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveOptical DriveOptical Drive
250 GB Samsung 840 EVO (OS) 3 TB Toshiba P300 (storage) Samsung SH-S243N 24x DVD Burner Samsung SH-S203N 20X DVD Burner 
CoolingOSMonitorKeyboard
Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) Filco Majestouch 104-key Cherry MX Blues w/NKRO 
PowerCaseMouseMouse Pad
Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate Basic, but premium round 
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post #7 of 10
Quote:
Originally Posted by Princess Garnet View Post
My C0 stepping Core 2 Duo E8400 that I bought day one had big sensor issues. For one, the CPU would be any given temperature, and the first core would be ~9C-11C higher, and the second would be yet another ~1

In short, no way to be sure what was what, but the C0 stepping Wolfdale's seemingly had alot of sensor plaguing issues.
y.


I have that problem, but mine is an E0.
post #8 of 10
Thread Starter 
Quote:
Originally Posted by TwoCables View Post
What's the Revision?

CPU-Z has it backwards for some reason (always has, too). The Revision in CPU-Z is the Stepping.

Is it C0 or E0 (those are zeros, not o's).



Well, that's better but still hot.
Those were my stock temps so I'm ok with it, not completely satisfied...but I have a terrible case atm.

I knew it sounded wrong, I originally typed in E0, but CPUZ said otherwise lol.
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post #9 of 10
have you made absolutely sure your voltage isn't on auto? even a small increase in speeds auto voltage will crank it up to super high volts
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post #10 of 10
Thread Starter 
Quote:
Originally Posted by ShortySmalls View Post
have you made absolutely sure your voltage isn't on auto? even a small increase in speeds auto voltage will crank it up to super high volts
LOL. After I tried an unstable OC at 4.2ghz, I put voltages back to auto...

Man I feel dumb. 3.6ghz stable maxing at 70C now. Not great, but much better than before. You sir are the man lol. Can't believe I forgot that.
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CPUMotherboardGraphicsRAM
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