Hello. I built my rig about 3 months ago now, and here's something I've been meaning to ask since then:
When I run Speedfan (the freeware program for reading cpu temps and fan speeds) things seem normal for the most part, but the "system" temp is consantly very hot! Here's a rundown of the temps:
Core 0-43 C
Core 1-37 C
Core 2-44 C
Core 3-44 C
The "system" temp is always above 92 and has gone as high as 98 once. Anyone know more about what this reading is from and if this is dangerous? I just figured at first it was for a sensor that's not on my mobo, but I'm getting nervous.
Oh, and I have an XFX Nvidia 790i mobo and an Intel Q9550 btw. Thanks so much for the help!!!!
"System" should be the sensor in the Northbridge and 90C, IF ACCURATE, is dangerously high. And 98C(200F) is about the melting temp for the plastic chip case. Something expensive may be getting fried. Don't trust SpeedFan alone, check temps in your BIOS and see how they compare with Speedfan. If you see 90C in the BIOS shutdown and fix it ASAP.
If not overclocked, 90C would make me suspect the chipset or CPU heatsinks are not on right. Speedfan may have the labels reversed too. It could be the CPU that's hot. The BIOS temps should be more accurate.
You'll have to use a thermometer or your fingers to really find the problem. For the finger test, 90C will be too hot to touch. You'll want ice cubes handy to treat the burn.
If you really have a part running 90-98C I recommend you remove the MB, remove the cooler, clean off all the old thermal goo from both cooler & chip, and reinstall the cooler with new grease. Check both northbridge & CPU heatsinks, make sure they're tight. Careful with both coolers, if you break a pushpin you'll have to buy a new heatsink.
My software temperatures never seem to match my thermometer. On my Gigabyte P45 board the temperatures for System & CPU are switched around between Speedfan and HWmonitor and PCwizard.
I have a temperature probe in the heatsink fins of my Northbridge. It currently shows 40C (103F) and that matches what it feels like to my fingers. Speedfan and HWmonitor report system temperature between 20 and 30C. I trust the thermometer more than Speedfan or the BIOS.
ON FURTHER REVIEW:
Both the XFX 790i boards I looked at have heatpipe coolers running from the voltage regulators, across the northbridge to the southbridge. That kind of heatsink is held in place pretty strongly and is harder than most to accidentally dislodge off the northbridge. But it could happen if it was ever dropped or if the board was ever picked up by the heatsink.
Those are spendy motherboards, I'd like to think XFX tech support will have useful advice. But tell them your BIOS or thermometer temps not the Speedfan temps. Speedfan can be misleading if not configured just right. And you may not need to say you've known it's been running over 90C for three months. That might dull their enthusiasm to be helpful.