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Checking CPU temperature

post #1 of 10
Thread Starter 


I've been trying to work out why there is such a big difference with the temps, when under load the bottom temp will increase and match the top temp, won't go past it, but the top temp is always considerably higher and never anywhere near as low as the bottom temp. I've read that AMD stopped using a thermostat type heat detection, they're using some form of algorithm to calculate the heat the processor will be running at.

Can anyone shed some light on this? I thought perhaps there could be an actual sensor on the motherboard which is giving the higher reading at the top, which would be the accurate reading, if that is the case, then the bottom reading is completely useless and miles off. I think I remember a post saying something about the AMD CPU needs to start too heat up before they're algorithm actually works?
post #2 of 10
Quote:
Originally Posted by Tuxxey View Post



I've been trying to work out why there is such a big difference with the temps, when under load the bottom temp will increase and match the top temp, won't go past it, but the top temp is always considerably higher and never anywhere near as low as the bottom temp. I've read that AMD stopped using a thermostat type heat detection, they're using some form of algorithm to calculate the heat the processor will be running at.

Can anyone shed some light on this? I thought perhaps there could be an actual sensor on the motherboard which is giving the higher reading at the top, which would be the accurate reading, if that is the case, then the bottom reading is completely useless and miles off. I think I remember a post saying something about the AMD CPU needs to start too heat up before they're algorithm actually works?


One is the cpu temp and the other is the socket temp.
post #3 of 10
Package temp is a calculated temp and it's a known bug that in idle it's wrong. Over about 30-35º C begins to be read correctly.
post #4 of 10
Thread Starter 
Quote:
Originally Posted by chrisjames61 View Post

One is the cpu temp and the other is the socket temp.
Quote:
Originally Posted by jacqlittle View Post

Package temp is a calculated temp and it's a known bug that in idle it's wrong. Over about 30-35º C begins to be read correctly.
Thank you both. Question answered thumb.gif
post #5 of 10
Quote:
Originally Posted by Tuxxey View Post



I've been trying to work out why there is such a big difference with the temps, when under load the bottom temp will increase and match the top temp, won't go past it, but the top temp is always considerably higher and never anywhere near as low as the bottom temp. I've read that AMD stopped using a thermostat type heat detection, they're using some form of algorithm to calculate the heat the processor will be running at.

Can anyone shed some light on this? I thought perhaps there could be an actual sensor on the motherboard which is giving the higher reading at the top, which would be the accurate reading, if that is the case, then the bottom reading is completely useless and miles off. I think I remember a post saying something about the AMD CPU needs to start too heat up before they're algorithm actually works?
Better grab: http://www.techspot.com/downloads/4645-amd-overdrive.html it's more accurate and those offsets are already applied.
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Main system
(10 items)
 
  
CPUMotherboardGraphicsRAM
AMD Ryzen R5 1600x Asus Prime X370 Pro Rx 460 by Gigabyte DIMM1: Kingston HyperX KHX3000C15D4/8GX 
Hard DriveCoolingOSMonitor
Samsung 960 Evo + Drive Drive #1 - SPCC Solid S... CM Nepton 140XL W10, W7, Linux Mint LG 28", Samsung 24", Samsung 19" 
PowerCase
660W Chieftek Dragon full server case 
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post #6 of 10
Thread Starter 
Quote:
Originally Posted by MishelLngelo View Post

Better grab: http://www.techspot.com/downloads/4645-amd-overdrive.html it's more accurate and those offsets are already applied.
Thanks, hadn't heard of AMD's overdrive before have got it installed now, but now I'm even more confused.

So I ran a prime95 blend test, here are the results from HW monitor and AMD overdrive after a couple of minutes:

post #7 of 10
AOD shows temps as Margin, it's margin to beginning of throttling which occurs at about 10c. The higher that number better it is.
There is also Logging which you can use during testing to see what was happening during time. Fast temperature raising would indicate bad heat transfer from CPU to cooler. There's also a burn in test you can use, it's more adequate than P95 unmodified for AMD. Your VID indicates about at par with CPU frequency.
Main system
(10 items)
 
  
CPUMotherboardGraphicsRAM
AMD Ryzen R5 1600x Asus Prime X370 Pro Rx 460 by Gigabyte DIMM1: Kingston HyperX KHX3000C15D4/8GX 
Hard DriveCoolingOSMonitor
Samsung 960 Evo + Drive Drive #1 - SPCC Solid S... CM Nepton 140XL W10, W7, Linux Mint LG 28", Samsung 24", Samsung 19" 
PowerCase
660W Chieftek Dragon full server case 
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Main system
(10 items)
 
  
CPUMotherboardGraphicsRAM
AMD Ryzen R5 1600x Asus Prime X370 Pro Rx 460 by Gigabyte DIMM1: Kingston HyperX KHX3000C15D4/8GX 
Hard DriveCoolingOSMonitor
Samsung 960 Evo + Drive Drive #1 - SPCC Solid S... CM Nepton 140XL W10, W7, Linux Mint LG 28", Samsung 24", Samsung 19" 
PowerCase
660W Chieftek Dragon full server case 
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post #8 of 10
I dont understand and probably never will but I want to try.

What's wrong with these temps and which one is right? I know the CPUID HWMonitor is wrong, at least the max temp. I read the bios temp when I rebooted and it said 45c.

I know the AMDOD is Thermal Margin, but how do I get the actual temp? I have tried many temp programs and they all read different.

I routinely go over the 72c max temp(CPUID HWMonitor) on both my computers and even have temps in the 80's with no ill effects.

Is there a way to read the bios temp without having to reboot into setup?

Thanks!


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R51600
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R71800X
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CPUMotherboardGraphicsRAM
R5 1600 Asus ROG Strix X370-F Gaming Asus Dual GTX 1060 6gb G.Skill Trident Z 3200 cl 14 
Hard DriveHard DriveCoolingOS
SSD Seagate Custom water cooling 240 rad Windows 10 Creators Mess 
MonitorKeyboardPowerCase
Acer 1080p Velocifire EVGA 650 Thermaltake Core P3 Snow Edition 
CPUMotherboardGraphicsRAM
R7 1800X ASUS Crosshair VI Hero ASUS RX 480 Strix 8gb OC G.Skill Ripjaws 3200 
Hard DriveHard DriveCoolingOS
Plextor M.2 Seagate Custom Water Cooled Hard Tube Loop  Windows 10 Creators Spyware 
MonitorPowerCase
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post #9 of 10
That's just it, you don't get actual temps with AMD processors. Maximum, shutdown temps vary from processor to processor. It ranges from somewhere about 62c - 70c per core. With that processor ~70c so 70 minus temp margin gives you approximate core temperature. Package temps are largely irrelevant with AMD, Ph II gets up to 90c for instance but core temps can be much lower at same time.
Main system
(10 items)
 
  
CPUMotherboardGraphicsRAM
AMD Ryzen R5 1600x Asus Prime X370 Pro Rx 460 by Gigabyte DIMM1: Kingston HyperX KHX3000C15D4/8GX 
Hard DriveCoolingOSMonitor
Samsung 960 Evo + Drive Drive #1 - SPCC Solid S... CM Nepton 140XL W10, W7, Linux Mint LG 28", Samsung 24", Samsung 19" 
PowerCase
660W Chieftek Dragon full server case 
  hide details  
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Main system
(10 items)
 
  
CPUMotherboardGraphicsRAM
AMD Ryzen R5 1600x Asus Prime X370 Pro Rx 460 by Gigabyte DIMM1: Kingston HyperX KHX3000C15D4/8GX 
Hard DriveCoolingOSMonitor
Samsung 960 Evo + Drive Drive #1 - SPCC Solid S... CM Nepton 140XL W10, W7, Linux Mint LG 28", Samsung 24", Samsung 19" 
PowerCase
660W Chieftek Dragon full server case 
  hide details  
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post #10 of 10
@Hotbrass

This cpu A series APU is probably a max operating temperature of 90c.

AMD OverDrive (AMD) recommends no more than 70c. (this is probably for sustained periods)

TMPIN0 is motherboard socket temp. (probably accurate)

Package (core temps) are not accurate in HWmonitor. Try HWinfo64 or coretemp
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