This is not 100% related but I too had some cooling insufficiency on my Clevo M571RU, mainly on the CPU side. The northbridge heatsink was pretty much useless too, there was a 2mm gap between the base of the heatsink and the core, and they were using thermal pads to solve(poorly) the problem.
Tried pretty much everything until one day I realized that it was better to made the custom parts myself. Started with the northbridge, I was noticing some discomfortable heat exactly on the area of the northbridge, in the palmrest. At the same time I was having some difficulties regarding overclocking +20Mhz over the stock FSB. Since the RAM timings were quite relaxed and I was certain that I was suffering memory controller instability. Using an old cooler of one ATI X800 I made the necessary modifications for it to fit, including a spring retention system that natively was absent. That way I eliminated the gap between the base and the core, and the dissipation capacity was improved greatly. I started being able to OC to +30Mhz over stock FSB without any problems and without the same heat in the palmrest.
Then I organized my efforts to the CPU heatsing. Since little could be done to improve the little and flimsy single heatpipe, I tried to improve the contact between the base and the heatpipe using a shroud that would improve the native one sided transfer to all over the heatpipe. I then realized that I had an old MOSFET heatsink laing around and I tried to alter it to fit the base of the heatsink, spreading the heat to the opposing side since I had some room there. Used some Artic Silver Thermal Epoxy and glued the two pieces. The CPU temps decreased significantly, and I was finally able to use my system without headphones to muffle the noise of the cpu fan(joking).
I refitted the cooper heatsinks in the GPU heatsing too, using the same Artic Silver Thermal Epoxy.
Before(sry no better one):
Now:
So my recommendation is, if you have the necessary tools try to add more metal to the heatsing, improve it somehow. Don't fix the problem with more noise, you will be fed up soon after.