i5 750 temps too high

[dtbecker]

Hello,

I have an older Lynnfield i5 750 @ 2.66GHZ Turbo Boost on (made no difference on or off).

This PC was originally prebuilt, with one 120mm intake fan on the front and one 80mm fan in the back (exhaust). (PSU has fan facing down)

Originally, I noticed it started getting rather hot in my room with my PC and was surprised to see temps up to 99c and throttling. I decided to disassemble and thoroughly clean each component including the heatsink with compressed air. I took off the heatsink, removed all traces of TIM with 99% alcohol and reapplied Arctic Silver 5 using the dot sized method. I tried both line and small pea sized dot, which only made a 3c difference.

My temps are now 75c under Prime95 after 15 minutes. CPU fan is running at 2700-2800 RPM. Ambient temperature is 83F (I live in Arizona)

I am using stock Intel Heatsink and computer is 8 years old.

With that being said, I originally noticed my motherboard would not throttle up my CPU fan when temps reached in excess of 80c, often climbing up to 83c before leveling off. My rear 80mm fan would also not increase with higher CPU temp. I had to use Speedfan to force my CPU fan to run at 100% to get decent temps (as in 75c)

In the BIOS, I have the option of disabling CPU fan control (which makes CPU fan run at 100%) and disabling System Fan Control. Disabling System Fan Control prevents my rear fan from being controllable. I would like to mention I updated my BIOS to the latest version but this didnt seem to affect anything.

With all this being said, what are my options? Why is my motherboard not throttling up my CPU fan to max to prevent high temps unless I force it to?

Also, can a lower GPU temp cause lower CPU temps? (I know this sounds crazy, just curious)

Cable management is excellent as well.

System:

Windows 10 Preview
i5 750 @ 2.66GHZ
Intel DP55WB Motherboard
6 GB DDR3 RAM @ 1333 mhz
1TB 7200 RPM HDD
400 W PSU
GTX 260 Core 216 with 896mb.

 

[VirtualLarry]

Ambient temperature is 83c (I live in Arizona)

I don't think that's correct.

 

[dtbecker]

I don't think that's correct.

I have corrected it in my original post, its 83F. Thank you for noticing.

 

[VirtualLarry]

To answer your question, personally, I generally turn OFF "Auto Fan" or "Smart Fan". Usually that makes the fans run at 100%.

Btw, how do you know that your fans aren't already at 100%? They may be "tired", and not wanting to run at as high an RPM as they used to, especially after 8 years.

You might consider just replacing the fans. Maybe get some higher-CFM replacements.'

 

[dtbecker]

To answer your question, personally, I generally turn OFF "Auto Fan" or "Smart Fan". Usually that makes the fans run at 100%.

Btw, how do you know that your fans aren't already at 100%? They may be "tired", and not wanting to run at as high an RPM as they used to, especially after 8 years.

You might consider just replacing the fans. Maybe get some higher-CFM replacements.'

Thank you for responding. Honestly, Im thinking of replacing the whole case with the Corsair 750D.

I can verify they are not at 100% because I know full RPM for these fans, and they are not running at it unless I use Speedfan to force full RPM. Im thinking something is messed up with the motherboard because its not revving up the fans.

 

[Flapdrol1337]

75C is completely normal with the stock cooler.

 

[beginner99]

75C is completely normal with the stock cooler.

This. 75C isn't bad and also no problem. i have an i-870 OCed to 3.4 ghz and have 65C..but with an NH-D14.

 

[ShintaiDK]

Temperatures is more than fine.

 

[dark zero]

Mmm temperatures are crazy high. Go and buy a Cooler Master Evo 212.

It should go at máx 65C, not more.

 

[ShintaiDK]

Mmm temperatures are crazy high. Go and buy a Cooler Master Evo 212.

It should go at máx 65C, not more.

Wrong.

 

[sm625]

It cant be 8 years old. We barely had 65nm quadcores in 2007.

 

[Yuriman]

To answer your question, personally, I generally turn OFF "Auto Fan" or "Smart Fan". Usually that makes the fans run at 100%.

Btw, how do you know that your fans aren't already at 100%? They may be "tired", and not wanting to run at as high an RPM as they used to, especially after 8 years.

You might consider just replacing the fans. Maybe get some higher-CFM replacements.'

Don't do this if you value quiet. Your PC doesn't always have equal cooling needs, and while it's sitting idle, you don't need the fans blasting.

I've found that some of the most important differences between cheap and expensive motherboards is the quality of their fan profiles, and ease of customization.

If you're experiencing throttling with the stock cooler, the best thing to do is to dismount it, clean it, and remount it with fresh paste. 75c is no issue though.

 

[dtbecker]

Temperatures is more than fine.

Thanks for the reply. Its interesting though that I still never figured out why my rear case fan (connected to the motherboard) and CPU fan don't spin faster with higher temps. I kid you not, if I don't use speed fan to rev them up, my computer will easily hit 85c or sometimes higher. You would logically think that if I maxed out the CPU 100%, the fans would increase due to an increase in temps.

My idle temps are good though at 37c and will climb up to 50c using Internet Explorer.

 

[dark zero]

Mmm I am still thinking that is not that fine... Remember that you might have a little room for high performance moments... TBH is better to get another CPU cooler to improve that temperatures.

 

[dtgoodwin]

Temperatures is more than fine.

Intel ARK says that the i5 750 should have a tjunction no higher than 72.7C. The Lynnfield series had unusually low thresholds for heat.

 

[myocardia]

OP, that room needs one of these: http://phoenix.craigslist.org/search/sss?sort=rel&query=swamp+cooler . Your heatsink is fine. Computers aren't supposed to be operated in 85+°F rooms.

 

[jkhoward]

Thanks for the reply. Its interesting though that I still never figured out why my rear case fan (connected to the motherboard) and CPU fan don't spin faster with higher temps. I kid you not, if I don't use speed fan to rev them up, my computer will easily hit 85c or sometimes higher. You would logically think that if I maxed out the CPU 100%, the fans would increase due to an increase in temps.

My idle temps are good though at 37c and will climb up to 50c using Internet Explorer.

Hi,

Most exhaust fans are connected to a PWR or AUX port which don't normally change speeds unless the BIOS specifically has an option for that. Your CPU fan should change its RPM if it is plugged into the correct spot.

On the motherboard, can you please provide me with the text right next to the 3/4 pin fan connector? It could be that they are plugged into connectors that don't actually throttle.

Thanks,
Joel

 

[dtbecker]

Hi,

Most exhaust fans are connected to a PWR or AUX port which don't normally change speeds unless the BIOS specifically has an option for that. Your CPU fan should change its RPM if it is plugged into the correct spot.

On the motherboard, can you please provide me with the text right next to the 3/4 pin fan connector? It could be that they are plugged into connectors that don't actually throttle.

Thanks,
Joel

I will unplug my computer and look into this. Interesting though since the CPU fan is obviously plugged into the CPU FAN connector on the motherboard and one would most likely think it would throttle itself up

This is my motherboards manual:

http://downloadmirror.intel.com/18131/eng/DP55WB_ProductGuide04_English.pdf

I plugged the rear fan into the Rear Chassis Fan Header.

Fan Headers
The function/operation of the fans is as follows:​

•

The fans are on when the computer is in the ACPI S0 state.

​

​

• ​

​

The fans are off when the computer is in the ACPI S3, S4, or S5 state.

​

​

• ​

​

Each fan header is wired to a tachometer input of the hardware monitoring and

control device.
​

​

• ​

​

All fan headers support closed-loop fan control that can adjust the fan speed or

switch the fan on or off as needed.
​

​

• ​

​

All fan headers have a +12 V DC connection.

The Desktop Board has a 4-pin processor fan header and two 4-pin chassis fan​

headers.

Intel​

​

® Precision Cooling Technology

​

​

​

​

​

​

Intel Precision Cooling Technology automatically adjusts processor fan speed based on
the processor temperature and adjusts chassis fan speeds based on the internal​

system temperature.

I posted the above from my manual, I know I plugged the fan in correctly since it was originally prebuilt and I documented everything before I took it apart. ​

​

​

​

​

 

[jkhoward]

Keep me posted!

 

[ShintaiDK]

Intel ARK says that the i5 750 should have a tjunction no higher than 72.7C. The Lynnfield series had unusually low thresholds for heat.

No, Intel ark says the Tcase is no higher than 72.7C.

Measuring Tcase requires an external sensor lapped in between the heatsink and the IHS. Unlike Tjunction that you can measure with software.

The Tjmax for Lynnfield is 99C if I recall right.

 

[jkhoward]

In your BIOS, are you using the optimized defaults? I know a lot of people who at one point disable all of the cool and quiet settings to improve performance not really knowing what they are doing. Is it possible that you may of disabled the fan properties in the BIOS at one point of the original builder?

 

[dtbecker]

In your BIOS, are you using the optimized defaults? I know a lot of people who at one point disable all of the cool and quiet settings to improve performance not really knowing what they are doing. Is it possible that you may of disabled the fan properties in the BIOS at one point of the original builder?

I remember all the original BIOS settings because I have a screenshot of the factory settings.

I know my higher ambient temperatures are not helping and are contributing to abnormal temps.

I could try to reset the BIOS but honestly I doubt this would make a difference.

 

[jkhoward]

human memory can be very bad sometimes. I would make a mental note of your sata configuration and set them to factory defaults.

 

[dtbecker]

human memory can be very bad sometimes. I would make a mental note of your sata configuration and set them to factory defaults.

I took screenshots of all my BIOS settings before changing them. And on my BIOS, the options are extremely limited. I thought about undervolting my CPU but than isn't an option on my motherboard since I can't lower Vcore.

 

[dtbecker]

Hi,

Most exhaust fans are connected to a PWR or AUX port which don't normally change speeds unless the BIOS specifically has an option for that. Your CPU fan should change its RPM if it is plugged into the correct spot.

On the motherboard, can you please provide me with the text right next to the 3/4 pin fan connector? It could be that they are plugged into connectors that don't actually throttle.

Thanks,
Joel

My motherboard has a 4 pin chassis header and 4 pin CPU connection. Reseting BIOS to defaults (not removing CMOS battery or CMOS jumper) but instead just using defaults did not change anything. Which means either the motherboard is bad or both the cpu fan and case fan are bad which I highly doubt.