CPU Overheat with water cooling

[AnsonTz]

First of all, I am a new hand of CPU overclock. Maybe there are something essential that I don't know or understand, sorry about that.

I just buy a new water cooler - Cooler Master Seidon 120V yesterday. Following steps on the installation guide, all the things seem to be installed properly, and when I boot the computer, there is a blue light which shows that the water cooler is working.

My CPU is core i5-750. and I follow the following video guide to have an overclock, but I set BCLK freq. to 160, which is the only thing different to the guide. The final freq. is about 3.1GHz (I forget the actual freq.)

http://www.youtube.com/watch?v=Llqhe3N1cJA

Everything seems OK after the first boot, CoreTemp shows the temperature of those four cores are about 40C at idle, about 50-60C when I open 3D game(FSX).

However, after I reboot my computer (just reboot, no anything else), CoreTemp shows those four cores are at 90C and more.

I want to ask that if I have done something wrong, hope you can help me.

P.S Sorry for my bad English, I am a little guy comes from Hong Kong 😉

 

[Azrael47]

Ok first of all, those temperatures (When overclocked) are fine, the 90 degrees is the real concern. Have you tried any other third party software such as SpeedFan or HWMonitor? If you haven't then I recommend you do so to see if they are also reading the suspicious 90 degrees when you reboot.

Downloads>
http://www.cpuid.com/softwares/hwmonitor.html
http://www.almico.com/sfdownload.php

As a test I would reboot but on the post message press the key (probably F1 or Del) to get into the bios, there I would go to temperature monitor and see if it is 90 degrees. You could simply have a sensor bug.

 

[AnsonTz]

Ok first of all, those temperatures (When overclocked) are fine, the 90 degrees is the real concern. Have you tried any other third party software such as SpeedFan or HWMonitor? If you haven't then I recommend you do so to see if they are also reading the suspicious 90 degrees when you reboot.

Downloads>
http://www.cpuid.com/softwares/hwmonitor.html
http://www.almico.com/sfdownload.php

As a test I would reboot but on the post message press the key (probably F1 or Del) to get into the bios, there I would go to temperature monitor and see if it is 90 degrees. You could simply have a sensor bug.

Yes...I tried to check the cpu temp. in the bios. The temperature is at 88C.

 

[Azrael47]

I would recommend you reseat your water block again as we don't know how well of a job you have done. Did you put a bit or a lot of thermal compound on your CPU or did you use the stock paste that was pre-applied to the water block?

 

[AnsonTz]

I would recommend you reseat your water block again as we don't know how well of a job you have done. Did you put a bit or a lot of thermal compound on your CPU or did you use the stock paste that was pre-applied to the water block?

Um...I have reseated my water block many times. I think I have applied the stock paste given by Cooler Master properly to increase the surface area between the water block and CPU and facilitate the cooling. Also, this model doesnt need water filling.

It seems that the water cooler is not out of order, as the temperature will be normal (overclocked to 3.4GHz, about 40-50C at idle, 50-60C playing 3D games) if I shut down the computer for a while (a few hours) then boot to windows. All the abnormal phenomenons just occur when I shut down the computer and immediately boot it.

Will it be the temperature sensor problem? No matter if I check the CPU temp. in BIOS or in "Open Hardware Monitor" (3rd party temp checker), the problem still occurs. Maybe I need to do something for the BIOS or CMOS?

 

[Azrael47]

It could well be a sensor problem thinking about it or if you shut down your water cooler may delay for a couple of seconds resulting in a hot CPU.

If the temperatures are ok when you boot normally (not straight away after shutting down) then you should have no problems! those temps are sill a little hot for idling but when gaming they are safe.

 

[AnsonTz]

It could well be a sensor problem thinking about it or if you shut down your water cooler may delay for a couple of seconds resulting in a hot CPU.

If the temperatures are ok when you boot normally (not straight away after shutting down) then you should have no problems! those temps are sill a little hot for idling but when gaming they are safe.

Is it common for water cooling? I think it should not a long delay and be such high temperature (over 90C) even I shut down and boot!!! immediately.

 

[emh2002]

I am having the same problem. The problem seems to be the waterblock / pump. It ceases to work when the computer is restarted. I am using a Maximus VI Gene motherboard where the waterblock is connected to CPU_FAN. It shows 0RPM upon restart where normally it is about ~2000.

To solve the problem, I routed the waterblock power through a voltage reduction cable to 7v and connected it to the 12v Molex connector from the PSU. It works with the voltage reduction cable, but not when I switch back to 12v. I'm planning to return this for RMA as this is definitely not a long term solution.