Overclock.net › Forums › Benchmarks › Benchmarking Software and Discussion › Prime95 large FFTs torture test, spike in temperature for a few minutes. Q6600
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Prime95 large FFTs torture test, spike in temperature for a few minutes. Q6600

post #1 of 5
Thread Starter 
Testing an Intel C2Q Q6600 at stock speeds, with locked down voltage, frequency, and fan speeds.

Over the first half hour I will have stable temps, then suddenly the temps will go up by 5+ degrees on all cores, remain stable, and then drop back to normal.


Any clues as to why this is happening?


Here is an example of the data I'm getting: [Constant Ambient temp at 25 C]

Code:
Time,Core 0 Temp. (�),Core 1 Temp. (�),Core 2 Temp. (�),Core 3 Temp. (�),,Core 0,Low temp. (�),High temp. (�),Core load (%),Core speed (MHz),Core 1,Low temp. (�),High temp. (�),Core load (%),Core speed (MHz),Core 2,Low temp. (�),High temp. (�),Core load (%),Core speed (MHz),Core 3,Low temp. (�),High temp. (�),Core load (%),Core speed (MHz),
19:14:43 04/09/14,42,36,33,34,,,40,42,100,2394.06,,35,36,100,2394.06,,33,33,100,2394.06,,34,35,100,2394.06,
19:14:53 04/09/14,42,36,34,34,,,40,42,100,2394.06,,35,36,100,2394.06,,33,34,100,2394.06,,34,35,100,2394.06,
19:15:03 04/09/14,42,36,33,34,,,40,42,100,2394.06,,35,36,100,2394.06,,33,34,100,2394.06,,34,35,100,2394.06,
19:15:13 04/09/14,42,36,34,34,,,40,42,100,2394.06,,35,36,100,2394.06,,33,34,100,2394.06,,34,35,100,2394.06,
...
...
...
19:29:44 04/09/14,42,37,34,35,,,40,43,100,2394.06,,35,38,100,2394.06,,33,34,100,2394.06,,34,36,100,2394.06,
19:29:54 04/09/14,42,37,34,35,,,40,43,100,2394.06,,35,38,100,2394.06,,33,34,100,2394.06,,34,36,100,2394.06,
19:30:04 04/09/14,42,37,34,35,,,40,43,100,2394.06,,35,38,100,2394.06,,33,35,100,2394.06,,34,36,100,2394.06,
19:30:14 04/09/14,42,37,35,36,,,40,43,100,2394.06,,35,38,100,2394.06,,33,35,100,2394.06,,34,36,100,2394.06,
19:30:24 04/09/14,44,37,35,36,,,40,44,100,2394.06,,35,38,100,2394.06,,33,35,100,2394.06,,34,36,100,2394.06,
19:30:34 04/09/14,43,37,35,36,,,40,44,100,2394.06,,35,38,100,2394.06,,33,35,100,2394.06,,34,36,100,2394.06,
19:30:44 04/09/14,45,39,39,39,,,40,45,100,2394.06,,35,39,100,2394.06,,33,39,100,2394.06,,34,39,100,2394.06,
19:30:54 04/09/14,46,42,39,39,,,40,46,100,2394.06,,35,42,100,2394.06,,33,39,100,2394.06,,34,39,100,2394.06,
19:31:04 04/09/14,46,42,39,39,,,40,46,100,2394.06,,35,42,100,2394.06,,33,39,100,2394.06,,34,39,100,2394.06,
19:31:14 04/09/14,46,42,39,40,,,40,46,100,2394.06,,35,42,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:31:24 04/09/14,47,42,39,39,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:31:34 04/09/14,47,42,40,40,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:31:44 04/09/14,47,43,40,40,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
...
...
...
19:44:45 04/09/14,47,42,40,40,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:44:55 04/09/14,47,42,40,40,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:45:05 04/09/14,47,42,40,40,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:45:15 04/09/14,47,42,39,38,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:45:25 04/09/14,47,42,39,38,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:45:35 04/09/14,46,42,39,38,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:45:45 04/09/14,47,42,39,39,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:45:55 04/09/14,46,40,37,37,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:46:05 04/09/14,43,37,35,35,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:46:15 04/09/14,43,37,35,35,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:46:25 04/09/14,43,37,35,35,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:46:35 04/09/14,42,36,35,35,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:46:45 04/09/14,42,37,34,35,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:46:55 04/09/14,42,36,34,35,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:47:05 04/09/14,42,37,34,35,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:47:15 04/09/14,42,37,35,35,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:47:25 04/09/14,42,36,35,35,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:47:35 04/09/14,42,36,35,35,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:47:45 04/09/14,42,37,34,35,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:47:55 04/09/14,42,37,34,35,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:48:05 04/09/14,42,37,35,35,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:48:15 04/09/14,42,37,34,35,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:48:25 04/09/14,42,36,34,35,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:48:35 04/09/14,42,37,34,35,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:48:45 04/09/14,43,37,35,35,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:48:55 04/09/14,42,37,34,35,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:49:05 04/09/14,42,36,34,35,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:49:15 04/09/14,42,37,35,35,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:49:25 04/09/14,42,37,34,35,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:49:35 04/09/14,42,36,34,34,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:49:45 04/09/14,42,36,34,34,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,1596.04,,34,40,100,2394.06,
19:49:55 04/09/14,42,36,34,34,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,1596.04,
19:50:05 04/09/14,42,36,34,34,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:50:15 04/09/14,42,36,34,34,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
19:50:25 04/09/14,42,36,34,34,,,40,47,100,2394.06,,35,43,100,2394.06,,33,40,100,2394.06,,34,40,100,2394.06,
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Western Digital Caviar Green Seagate Baracuda Generic DVD Burner Windows 7 Home Premium 
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Razer DeathAdder Wooden Desk 
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Core 2 Duo e6750 Gigabyte GA-73VM-S2 Sparkle Geforce GT 440 1GB DDR3 OCZ Reapers DDR2 
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post #2 of 5
errrm surely that is completely normal for P95 to raise, and lower, the temps during that test, ie they do not remain constant -they fluctuate -at least that is what I have seen.

Why do you lock the fan speed??
post #3 of 5
It's normal for P95 to do that with temps as it cycles through the various load levels it stresses the system with.
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post #4 of 5
Thread Starter 
Quote:
Originally Posted by daguardian View Post

errrm surely that is completely normal for P95 to raise, and lower, the temps during that test, ie they do not remain constant -they fluctuate -at least that is what I have seen.

Why do you lock the fan speed??

I lock it to get consistent numbers for the performance of the heatsinks I am testing.

I guess I'll need to do complete custom settings and lock the program to a certain single settings to get more consistency. I thought that would be achieved by using a specific torture test, but I guess not.
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Sigma
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Core 2 Quad Q9550 GIGABYTE EP45T-USB3P HIS Radeon HD 4870 Turbo G.Skill Ripjaws 7-8-7-24 
Hard DriveHard DriveOptical DriveOS
Western Digital Caviar Green Seagate Baracuda Generic DVD Burner Windows 7 Home Premium 
MonitorKeyboardPowerCase
2 x Asus 23" Rosewill Black normal keyboard Antec TP 750 Antec Nine Hundred 
MouseMouse Pad
Razer DeathAdder Wooden Desk 
CPUMotherboardGraphicsRAM
Core 2 Duo e6750 Gigabyte GA-73VM-S2 Sparkle Geforce GT 440 1GB DDR3 OCZ Reapers DDR2 
Hard DriveCoolingOSMonitor
WD Caviar Green  Stock Win 7 Ultimutant 2 x ASUS VS238H 
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Rosewill cheapo "gaming keyboard" ULTRA 400W  None atm Razer Deathadder 
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post #5 of 5
I see, that makes sense, but as long as you run the same P95 test, regardless of the fluctuation in temp due to the cycle of the test, then your testing environment should be considered equal.

Which P95 test are you using? For max heat on the CPU choose the in-place large FFT.
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