|Speed fan gets it's information from readings generated by sensors connected to a chip connected to, or circuits built into, the mboard's bios. The current readings are also in the bios. You can go into the bios Setup and determine which current temp is for what. |
The readings in the bios can be more accurate than those in Speedfan because they've been calibrated to the mboard - if the readings are different in Speedfan, tweak a setting in Speedfan to make it the same as in the bios.
"when I'm playing GPU intensive games it shuts my system down."
What shuts it down? A setting in Speedfan, or the mboard does it automatically?
If the mboard does it automatically, that can be caused by your cpu overheating, even if it's fan is spinning fine.
Unplug the case/power supply.
Power off your monitor.
Open up the case by removing the left panel as seen when you're looking at the front of the case.
If the cpu fan/heatsink has mung (dust, lint, etc.) on it, clean it off, but DO NOT use a vaccuum cleaner to do that (they produce a tremendous amount of static electricity when running, and anything connected to them can discharge that to your components) - use canned air, or an air nozzle if you have access to an air compressor, or an artist's brush that can be used in small spaces, etc. It may be difficult to clean the top of the heatsink under the cpu fan - the most likely place to have mung on it - and the bottom side of the cpu fan blades unless you remove the fan. If you have a case fan, clean that too if it needs it.
Check for mung on the fan and heatsink on the video card in a slot too, if that applies, and the power supply.
Make sure the power supply fan is spinning - you should be able to detect at least a slight breeze at the back of the case where it's grille is.