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i7 Idle & Load CPU temperature Issues (differences)

post #1 of 4
Thread Starter 
I have really really annoying temperature difference using the same CPU, same HSF (CM N520), and same thermal paste at similar ambients.

So with my old Asrock P67 Extreme 4 mobo and my i7 2600k, my cpu idles at
29-30'C and 52'C P95 load with an ambient of 74'F.

With my new Asrock B3 P67 Extreme 4 mobo and the same i7 2600k, my cpu idles at 39'C and 62'C P95 load with an ambient of 76'F.

The CPUs are at stock, not overclocked, same voltages, using the same AC MX-2.

I've tried reapply thermal paste about 5x. I tried pea/grain method, then spread method, then grain method again, etc... all results so far results in idles of about 9'C-10'C hotter and full load around 9'C-10'C hotter.

Is there something wrong with my mobo temperature sensor or is the sensor entirely determined by the cpu?

Or is repeated installing/reinstalling of my HSF screwed up the retention bracket or base plate of my heat sink somehow that now it is not as effective?
post #2 of 4
Make sure the board is not adding more voltage through the bios. maybe ambient temps have increased. I would not worry about it too much. your temps are fine.
X79-GCN
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X79-GCN
(22 items)
 
  
CPUMotherboardGraphicsRAM
Intel 3930K 4.5GHz HT GIGABYTE GA-X79-UP4 AMD R9-290X GEil Evo Potenza DDR3 2400MHz CL10 (4x4GB) 
Hard DriveCoolingCoolingCooling
Samsung 840 Pro 120GB EK Supremacy (CPU) NF F12's P/P (360 Rad)  NF A14's (420 Rad)  
CoolingCoolingCoolingCooling
XSPC Chrome Compression Fittings EK RES X3 150 Primochill PremoFlex Advanced LRT Clear 1/2 ID EK-FC (R9 290X) 
CoolingCoolingCoolingOS
EK D5 Vario Top-X  Phobya G-Changer V2 360mm Phobya G-Changer V2 420mm Win 10 x64 Pro 
MonitorKeyboardPowerCase
BenQ XR3501 35" Curved Corsair Vengeance K90 Seasonic X-1250 Gold (v2) Corsair 900D 
MouseAudio
Logitech G400s Senn HD 598 
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post #3 of 4
Can you update your specs in your sig? They're outdated; can't even see what system you have (other than what you typed out).

What is your voltage at load when you ran prime at stock speeds? What cooling are you using? Where are you getting these temps? What program? What are the actual individual core temps? If the temp is the "Cpu temp" shown in the BIOS or shown by software as an individual "Cpu temp", then that may be using an infrared sensor by the IHS, and that can be calibrated by the BIOS, and sometimes can be way off.
SB Rig
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SB Rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7-2600k Gigabyte P67A-UD5 B3 R9 290X 16GB 
Hard DriveOptical DriveOSMonitor
WD 2 TB, WD 1 TB, 250gb Liteon ihbs212 blu-ray burner/reader XP+W7 Benq XL2720Z 
KeyboardPowerCaseMouse
Ducky Shine 69/Year of the Goat/Shine 5 Seasonic Platinum X1000 Corsair 760T Logitech G502 with r0ach approved ™ sensor 
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Puretrak Talent 
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post #4 of 4
Thread Starter 
Specs:
i7 2600k with CM N520
8GB DDR3 RAM
6950
750w Zalman PSU
CM case with 4 fans & a bottom mounted PSU (good airflow)

Using HW-monitor and CPU-Z to read temps/volts, and Prime95 and IBT to stress test

I don't think the board is adding more voltage...CPU-Z and HW-monitor is reading the volts as the same for both the old and new B3 motherboard. I have all the motherboard settings at the same settings too. My ambient is only 2-3'F hotter than when I used my previous mobo...which I don't think should be responsible for a 10'C increase in both idle and load temperatures.

I know my temps are not terrible, but they're not good either - and the fact that they're 10'C hotter than what they used to be despite the same hardware and BIOS settings is really annoying, and will limit any future overclocks.
Edited by Bluescreendeath - 4/19/11 at 5:15am
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