i5 3570k on ASUS P8Z77-V_LX overheating to 170F, all fans spinning

My i5 3570k CPU temp rises steeply to 170 F when streaming internet videos or even playing solitaire. Otherwise it stays at about 110 to 130 F. In this snap you can see the ASUS sensor for the ASUS P8Z77-V_LX and Speedfan. I don't know what ASUS calls "Power Fan", maybe the fan in the power supply? All fans seem to be spinning fine. But the Zero RPM reading for AUX2 (Chassis fan 1) is puzzling. I do have an aftermarket 200mm fan in the Coolermaster HAF 912 case top that perhaps the sensors aren't reading? Then there's the extreme reading for AUXTIN1, always 237 F, never varies. I Googled AUXTIN1 and found a few links saying to ignore it. I watched a Youtube video about configuring Speedfan's fan speed control, but must admit I didn't understand it.



Could this extreme temp rise just be due to 7 year old thermal paste? Or, do you think replacing the PS or the CPU fan would be a good strategy?


p.s. Stock CPU fan/heatsink. No GPU card, strictly the onboard Intel 4000. And, disabled, I need a technician over here to replace anything, even paste

I just found this: Open Hardware Monitor - Core temp, fan speed and voltages in a free software gadget
Open Hardware Monitor - Core temp, fan speed and voltages in a free software gadget
The Open Hardware Monitor is a free open source software that monitors temperature sensors, fan speeds, voltages, load and clock speeds of a computer.


With this it was easy to bump my CPU fan speed up to 2073 RPM @"100%"- more than double what it was. This is confirmed by Speedfan and by the ASUS tool. Who knows if that's dangerous, but I'll see if the CPU temp goes down. Then if it's still alive I'll probably take a more prudent %.

In my opinion:
- if you don't take the heat sink from the CPU, thermal paste never needs to be replaced.
- Thermal paste: better is a very thin layer.
- As your computer is +5 years old, I would say you need to clean the heat sink fins. If you can take out the fan from the heat sink without removing the heatsink, use a paint brush and an air / vacuum to clean (the heat sink). Be very careful cleaning the fan blades. The axle is very delicate.

On BIOS or with some Asus configuration software, you probably can set a relation between temperature and fan speed. For my CPU, I have set the fan to minimal speed till 50ºC and then it begins to increase to the maximum fan speed at 80ºC

Megahertz07 said:

In my opinion:
- if you don't take the heat sink from the CPU, thermal paste never needs to be replaced.
- Thermal paste: better is a very thin layer.
- As your computer is +5 years old, I would say you need to clean the heat sink fins. If you can take out the fan from the heat sink without removing the heatsink, use a paint brush and an air / vacuum to clean (the heat sink). Be very careful cleaning the fan blades. The axle is very delicate.

Thanks, interesting, never heard never needs to be replaced. Also, when my tech visits I'll tell him about cleaning the fins/blades.

On BIOS or with some Asus configuration software, you probably can set a relation between temperature and fan speed. For my CPU, I have set the fan to minimal speed till 50ºC and then it begins to increase to the maximum fan speed at 80ºC

I'll take a look in the BIOS next time I boot, but I've been in there many times and haven't seen that control. The only Asus software I have is AI Suite II and while it's fine for monitoring I don't see any fan control. That's why I'm using Open Hardware Monitor to set a CPU fan speed. I do wish it had a response to heat, it's strictly a Manual speed setting.

From P8Z77-V_LX manual
(Page 3-25) On BIOS - Advanced Mode - Monitor Tab, you can set the fan operation mode.
(page 4-9) You can install the FAN Xpert+ to create a fan operation curve.

Open hardware monitor does NOT set anything. It only monitors / shows the MB sensors on the screen. It's very good and it's the one I use.

I looked in the BIOS Advanced/Monitor but all I could find is to set the CPU fan to a 500rpm minimum. FAN Xpert+ throws an error, I even dl'd and installed a new one, another error when called. OTOH the Open Monitor does (for me) allow control of the CPU fan speed. Notice it's running at 2054rpm instead of the default c.1010
This is confirmed by the Asus monitor, SIV, Speedfan etc

From http://openhardwaremonitor.org/wordp...onitor-WMI.pdf
I may be wrong but my undestand is that Control is just a way to set the fan speed as a percentage instead of rpm.

Fan control is a BIOS setting.

Did you looked at your heat sink with a flash light to see if it is clogged with dust?