Haven't put speedfan on this computer yet, but even here in 110+ AZ heat I haven't had any shutdowns...occasionally I will stick my hand in the glovebox to see how things are cooking, but I am always pleasantly surprised to find my fan arrangement is doing its job and keeping things under control. I did also install a Jetway CPU fan (Obviously, I had some extras!) on the other major heat sink (north bridge?) FYI. It has connectors for three fans, so why not use them. My third fan is a large one mounted to the back of the glove box which draws in air from the floor to the compartment. How is your MB installed?