Core i5 Temperature

[Quicksilver911]

Hello, I have a question about cpu temps. I recently read a thread ''Intel Temperature guide'' by CompuTronix. Very good thread lots of information, but one thing kept me questioning. In the thread it says that the CPU temperature is about 5 degrees celsius lower than the core temperatue.

Intel's Thermal Specification is "Tcase", which is CPU temperature, not Core temperature. Core temperature is 5C higher than CPU temperature due to differences in sensor proximity to the heat sources. For example, Tcase for the i5 4690K is 72C. Tcase + 5 makes the corresponding Core temperature 77C.

In my situation the first generation core i-5 750 CPU temperature stays 30-32c no matter under load or idle, and the core temperatures is about 40-70c celsius monitoring temps with HWMonitor, Aida and CAM. So the difference is 10 to even 40 degrees celsius, and Aida is showing core temps about 10 degrees lower than the HWMonitor, i'm confused which temp is the real one? I will add screenshot what both apps are showing under load and are these temps safe for my cpu?

I have stock cooler, and another problem is that it won't change it's rpm no matter what the temps as you can see in HWMonitor screen..all three are Cpu, Case, and Psu fans I have HP 8100 elite, and in bios there is no such option to set the auto Fan config, but in MB manual it says that it does control rpm's automatically, the only thing i can change is the idle fan levels, from 1-5, i'm currently set it to 2, and the rpm's are 1300 for all 3 fans, in level 1 they are about 1200rpm's and the funny thing is that they all are working and changing in equal RPM, even the psu cooler is controlled by motherboard because it is HP, and it does not have standart PSU with 20-24pin adapters, the stu*** HP has it's own PSU connectors, I can't change the PSU, so i had to buy GTX 750ti, as it doesn't need additional power connector however I wnated the 950ti. I'm thinking about CPU cooler upgrade ''Deepcool Ice Gammaxx 300 Universal'' it costs about 20 euros in my country, how do you think, I need the upgrade or is it okay with these temps? Or maybe cut the crap and buy another ''normal'' overclockable used LGA1556 Motherboard around 50$, as I already have another PSU and case, it's a bit offtopic but how do you think is it worth to buy an old LGA1156 MB, I have 12gigs of ram Hyperxblue 1600, core i5 750 quad core 2.6ghz & 3.2 Turbo Boost and gtx 750ti, If I overclock the CPU, and change the GPU, will I be able to play all games at least in HD 1080p for couple of years ahead? Or better I start save up, for another PC, and sell this crap, In my country for this setup I can get about 250$..http://

 

[manleysteele]

The core temperature figure you are getting from a direct reading is probably correct. At 70C, it's fine. Don't start to worry unless it stays higher than 75C for prolonged periods. Your fan profile is probably tied to the CPU temp reading and that is why your fans always run at the same speed. I'm not familiar with the HP Bios, but you may be able to change it to react to core temp with a setting. If you already have the side off the case, check to make sure your CPU fan is attached to the correct fan header. Otherwise, I wouldn't bother. Unless you are experiencing temperature problems, I wouldn't bother with a bigger cooler, either.

If you're going to switch to the other system, go ahead and buy the graphics card you are going to end up with in a new system. It should be able to run in the system you have described well enough until you can save enough to buy a new mainboard and CPU. When you do upgrade, you'll have to decide between DDR3 and DDR4 when you choose the mainboard. If you decide on DDR4, you'll need that as well. I hope this helps you.

 

[Quicksilver911]

The core temperature figure you are getting from a direct reading is probably correct. At 70C, it's fine. Don't start to worry unless it stays higher than 75C for prolonged periods. Your fan profile is probably tied to the CPU temp reading and that is why your fans always run at the same speed. I'm not familiar with the HP Bios, but you may be able to change it to react to core temp with a setting. If you already have the side off the case, check to make sure your CPU fan is attached to the correct fan header. Otherwise, I wouldn't bother. Unless you are experiencing temperature problems, I wouldn't bother with a bigger cooler, either.

If you're going to switch to the other system, go ahead and buy the graphics card you are going to end up with in a new system. It should be able to run in the system you have described well enough until you can save enough to buy a new mainboard and CPU. When you do upgrade, you'll have to decide between DDR3 and DDR4 when you choose the mainboard. If you decide on DDR4, you'll need that as well. I hope this helps you.

Ok that's clear, but which core temp is right then? The HWmonitor which shows 70 degrees celsius or the Aida who's showing about 10 degrees lower core temp, both when cpu is under stress test. And why then in my case the cpu and core temps have so big difference, why it don't have only the 5 degree difference. And also can you see my added screenshot in my post?? I am new to this forum, so i don't really know if i'm doing it right, i clicked the picture icon, copyed url in it, but it won't show in my thread why is that?

 

[manleysteele]

Yes. I can see the picture. The 5 degree difference from the article is a guide for use when you can not measure one of the temperatures directly. I don't know which of the core temperatures is correct, but I would believe the higher of the two, just to be safe. I don't know where the board is measuring the CPU temperature. Obviously, it is wrong. It is almost certainly the cause of your CPU fan's strange behavior. If your owner's manual doesn't provide a mainboard pinout for you to check, you may be able to find one online. You may also be able to read the fan and temp designators on the board. Bring a good magnifying glass if you're going to try that. Keep working the problem and you'll figure it out.

 

[Quicksilver911]

Ok, thanks for help 😉

 

[CompuTronix]

Quicksilver911,

Your 45nm 1st Gen LGA 1156 Core i5 750 doesn't actually have the single analog "CPU" temperature sensor. The Intel Temperature Guide explains this in Section 3 - CPU temperature, so you might want to read it again.

The 65nm and 45nm Core 2 LGA 775 all have the sensor, but only the 45nm 1st Gen LGA 1366 also has it. The 45nm 1st Gen LGA 1156 processors do not, nor do the 32nm 1st Gen and later processors found in all the LGA 115x sockets.

They do, however, all have a Digital Thermal Sensor (DTS) within each Core.

Your i5 750 was introduced when Intel first eliminated the analog "CPU" temperature sensor, and decided to use only the Digital (DTS) Core temperature sensors. Most owners found this confusing at that time, so you're not the first.

manleysteele is correct when he said it's obviously wrong. Your "CPU" temperature doesn't change or follow 5c behind "Core" temperature because HWMonitor and AIDA64 are misinterpreting the proprietary BIOS from the motherboard in your HP 8100 elite.

In your screenshot it looks like HWMonitor and AIDA64 have both reversed the terms for the "CPU" and "Motherboard" sensors. This means CPU might actually be Motherboard, and vice versa, which would explain the puzzling temperatures. It would be plausible for a motherboard to run at 30C, but never at 64C, which depending upon polling intervals, would instead be plausible for the hottest core.

In 2nd Gen and later Core i processors, the hottest Core is used for "CPU" temperature, which is sometimes shown as "Package" temperature. This CPU temperature issue is a BIOS problem that you might be able to resolve if HP has a newer version available for download and flash. I realize you're also having fan issues, but don't get stuck on CPU temperature. Try a BIOS flash, which might fix both problems.

For accurate monitoring of Core temperatures, I recommend that you download and run Core Temp because it is indeed accurate, and because of it's simple user interface. A good alternative is Real Temp, which is also accurate, and was developed specifically for Intel processors.

Just FYI, keep in mind that it's never a good idea to run more than a single monitoring utility. Running multiple utilities concurrently may cause them to interfere with the accuracy of one another.

CT

 

[Quicksilver911]

Yes, you are right about the cpu and motherboard temps, they are readed reversely, because i upgraded my cpu cooler, and the motherboard temperature dropped about 20 degrees celsius, but the cpu temperature stayed the same, I already tried to upgrade bios, I even tried 2 newer versions, and none of them corrected this issue, and i'm afraid of my system overheating, because it won't change the fan rpm's as the temperatures rises when i'm playing games, so i have to set the fan idle level at 3 in bios so they are spinning faster all the time about +400rpm, but the pc is getting loud and it [strike]pisses[/strike] me out. As I understand there is no solution of this? I already searched google and forums for threads and topics about this hp model and motherboard there is very little info about this model, and no info about the fans or temps..

 

[CompuTronix]

SpeedFan should get the job done, however, it has a bit of a learning curve, so it's not for the squeamish. Read the .chm file after it's installed, and read the info on the website. It's highly configurable and it takes some work to get it set up properly, but once it is, it's really sweet. I've run it for many years and I find that it does a better job of managing fans than BIOS.

 

[Quicksilver911]

SpeedFan should get the job done, however, it has a bit of a learning curve, so it's not for the squeamish. Read the .chm file after it's installed, and read the info on the website. It's highly configurable and it takes some work to get it set up properly, but once it is, it's really sweet. I've run it for many years and I find that it does a better job of managing fans than BIOS.

Ok, thanks for the help 😉