Far be it for me to pour cold water on your efforts but is there a reason why you couldn't use MBM5 in conjunction with SHDN?. It's what I'm using and if I get 40°C CPU temp my system auto shuts down in the normal way.
Thinking about it there are 3 areas your unit would be better>
1. If you are using win 2K in "standard PC mode" or an older PC type so you have to press the power button to turn it off
2. If you don't have CPU bios temp reporting from your mobo
3. If Windows just happens to lock-up and or crash in some way when shuting down, which is always a possibility with Windows.
So far the two apps in the links below have saved my system once, when the pump fuse blew for no apparent reason.
full details on
MBM5 with
SHDN and how to use them
HERE
Do make sure it works once installed by setting a shutdown temp below your max, and seeing that it will actually shutdown the PC. It wont work if you have to press the power button to turn off your PC, (like you do if you are using Win2K in "standard PC" mode).
It does amaze me we don't have user selectable bios shutoff temp settings with the AMD mobos just like my old Pentium systems used to.?