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I7 3770K - Temps Up/Down

post #1 of 7
Thread Starter 
Is there a reason why my cpu jumps to 87 c and then drops down to 65-70 after 15-20 minutes and up to 87 then drops again.. during prime95?



post #2 of 7
1.) Quite simply be too much thermal paste between heatsink and CPU, and its taking a few seconds conduct the heat and then stabilize the cooling.

2.) The heatsink is not on tight enough.

3.) The CPU fan is not on full blast and the RPM increases based on the amount of temperature on the CPU DST. This would be controlled by motherboard BIOS settings too.
Snowdevil
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Snowdevil
(16 items)
 
ASUS G750JM
(9 items)
 
 
CPUMotherboardGraphicsGraphics
[i7 4790K @ 4.4 GHz (1.186v)] [Asus Sabertooth Z97 Mark S] [nVidia Geforce GTX 1080] [nVidia Geforce GTX 1080] 
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[G.Skill 32GB DDR3 2133 MHz] [Crucial MX100 256GB] [Phanteks PH-TC12DX] [Win 10.1 Pro] 
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[ThermalTake GT10 Snow Edition] [Razer Mamba - Chroma] [Razer Kabuto] [Razer Man O' War] 
CPUMotherboardGraphicsRAM
i7 4770HQ Intel HM87 Express Chipset Geforce GTX 860M 8GB DDR3L 1600 MHz 
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post #3 of 7
Quote:
Originally Posted by 90C07B12 View Post

Is there a reason why my cpu jumps to 87 c and then drops down to 65-70 after 15-20 minutes and up to 87 then drops again.. during prime95?




It's because Prime95 is putting it under different amounts of stress during the testing. Some tests are more strenuous than others (within the test phase, at least).

Edit: But to be honest, 87C on Prime is really hot. Try and reseat heat sink and get better thermal paste.
Edited by truestorybro545 - 3/3/13 at 2:51pm
post #4 of 7
Thread Starter 
Quote:
Originally Posted by RagingCain View Post

1.) Quite simply be too much thermal paste between heatsink and CPU, and its taking a few seconds conduct the heat and then stabilize the cooling.

2.) The heatsink is not on tight enough.

3.) The CPU fan is not on full blast and the RPM increases based on the amount of temperature on the CPU DST. This would be controlled by motherboard BIOS settings too.

I am using this thermal paste and I applied the same quantity as in this video by the manufacturer https://www.youtube.com/watch?feature=player_embedded&v=qFhbqiFh9Us

I did re seat the heat sink.

Ill check bios settings for fans.

I forgot to mention that his happens only when I overclock. I get normal stable temps on stock
Edited by 90C07B12 - 3/3/13 at 3:07pm
post #5 of 7
Quote:
Originally Posted by 90C07B12 View Post

Quote:
Originally Posted by RagingCain View Post

1.) Quite simply be too much thermal paste between heatsink and CPU, and its taking a few seconds conduct the heat and then stabilize the cooling.

2.) The heatsink is not on tight enough.

3.) The CPU fan is not on full blast and the RPM increases based on the amount of temperature on the CPU DST. This would be controlled by motherboard BIOS settings too.

I am using this thermal paste and I applied the same quantity as in this video by the manufacturer https://www.youtube.com/watch?feature=player_embedded&v=qFhbqiFh9Us

I did re seat the heat sink.

Ill check bios settings for fans.

I forgot to mention that his happens only when I overclock. I get normal stable temps on stock

If it doesn't stay high for long I would say forget about it. If it does in fact cool down quickly, then you are fine. Just keep an eye on it till you are 100% sure. Even the temperature spike is still under Intel's recommend TJmax.

Just make sure that Throttle control on your fan is reasonable, or just switched off, to get full fan speed.
Snowdevil
(16 items)
 
ASUS G750JM
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CPUMotherboardGraphicsGraphics
[i7 4790K @ 4.4 GHz (1.186v)] [Asus Sabertooth Z97 Mark S] [nVidia Geforce GTX 1080] [nVidia Geforce GTX 1080] 
RAMHard DriveCoolingOS
[G.Skill 32GB DDR3 2133 MHz] [Crucial MX100 256GB] [Phanteks PH-TC12DX] [Win 10.1 Pro] 
MonitorMonitorKeyboardPower
[LG 29UM65 (2560x1080)] [QNIX Evo II LED (2560x1440)] [WASD v2 Tenkeyless] [NZXT Hale90 v2 ] 
CaseMouseMouse PadAudio
[ThermalTake GT10 Snow Edition] [Razer Mamba - Chroma] [Razer Kabuto] [Razer Man O' War] 
CPUMotherboardGraphicsRAM
i7 4770HQ Intel HM87 Express Chipset Geforce GTX 860M 8GB DDR3L 1600 MHz 
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Samsung SSD EVO DVD-RW Stock Windows 8.1 
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1920x1080 TN 
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Snowdevil
(16 items)
 
ASUS G750JM
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CPUMotherboardGraphicsGraphics
[i7 4790K @ 4.4 GHz (1.186v)] [Asus Sabertooth Z97 Mark S] [nVidia Geforce GTX 1080] [nVidia Geforce GTX 1080] 
RAMHard DriveCoolingOS
[G.Skill 32GB DDR3 2133 MHz] [Crucial MX100 256GB] [Phanteks PH-TC12DX] [Win 10.1 Pro] 
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[LG 29UM65 (2560x1080)] [QNIX Evo II LED (2560x1440)] [WASD v2 Tenkeyless] [NZXT Hale90 v2 ] 
CaseMouseMouse PadAudio
[ThermalTake GT10 Snow Edition] [Razer Mamba - Chroma] [Razer Kabuto] [Razer Man O' War] 
CPUMotherboardGraphicsRAM
i7 4770HQ Intel HM87 Express Chipset Geforce GTX 860M 8GB DDR3L 1600 MHz 
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post #6 of 7
Thread Starter 
Quote:
Originally Posted by RagingCain View Post

If it doesn't stay high for long I would say forget about it. If it does in fact cool down quickly, then you are fine. Just keep an eye on it till you are 100% sure. Even the temperature spike is still under Intel's recommend TJmax.

Just make sure that Throttle control on your fan is reasonable, or just switched off, to get full fan speed.


I got the fans connected directly on my psu dont have them on my motherboard only the ones that are on the heatsink are connected to the CPU pins. The problem is that the temperature stays at 87 for 20 mins then jumps down to 60s and then up to 87 again for another 20 minutes and so on....

Maybe its my airflow ? Do you think I need more intake fans?




UPDATE: So I put back everything on stock No overclock and removed the speed reducers from the fans and the temps dropped to around 60c the problem is that now I dont have my overclock and the pc sounds like a leaf blower
Edited by 90C07B12 - 3/3/13 at 3:41pm
post #7 of 7
Thread Starter 
So today something weird happened I have everything on stock and refitted the heatsink but I am getting idle temps of 45-50 and full load temps with prime around 70? Something weird is happening any ideas?
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