Bizarre temps from motherboard sensor

w00tles · 11 Sep 2010 at 00:36

I've recently set up a i5-760 with a ASUS p7P55d-e LX board. I fired up prime95 to check the temps at full load (running at stock)

The motherboard utility shows the CPU as being generally very hot indeed... the motherboard reports CPU at 54 degrees when idle, and motherboard at 37 degrees. Room temp is about 27. Is this really normal? According to the motherboard I'm hitting 80 degrees under full load - even undervolted @ 1.10v Vcore, wtf!

OTOH looking in speedfan, the core temps (Core0,Core1,Core2,Core3) are reported consistently 20 degrees lower than the motherboards CPU sensor. Speedfan reports about 35 idle, 60 under full load.

I am using the stock HSF . I think it is attached properly since pressing down on the HSF while stress-testing had no effect on temps.

Which temperature do I believe? it seems speedfan is more realistic, but I dont want to go ahead and fry my CPU while the motherboard sensor is screaming 100+ degrees.

blitzyuk · 11 Sep 2010 at 02:27

Each core temp is only an estimated temperature and not a true reading.

Try CPUID Hardware Monitor its a great program for showing temps, plus fan speeds and voltages.

You could also try getting a different HSF or invest in some watercooling. I use the corsair H50 myself but then again im using an AMD processor.

RJC · 11 Sep 2010 at 08:48

Compare temps with Real Temp & Core Temp.

I found these to show similar to HW Monitor.

bifday2k · 11 Sep 2010 at 10:20

Im guessing Wootles is using Pc Probe for mobo/cpu stuff, as its an asus mobo.

The cpu reading done by Pc probe is accurate and does read the same as HWMonitor would, but i think he is confusing Overall CPU temp and core temps.

So as you can see in the pic below, PC probe dos'nt show core temps, only the overall cpu temp, and as u can see from HWmonitor and real temp, the core temps are a lot different to the overall temp.

So Pc Probe is ok to use, but only along side other stuff, for example i have both Pc probe and Realtemp to load on start up, Pc Prope in the top right corner of my screen for quick glances of stuff, and real temp minimized for core temps, which are the best to go by when finding heat of the processor.