SOURCE: Can I upgrade my Macbook Pro to more than 4GB ram?
4GB is the MAX but only 3GB is utilized.
What Os are you running. Tiger Leopard Snow Leopard?
Your cooling fan is clogged with dust, not allowing enough air to circulate through it. Use compressed air and blow out the vents. The fan constantly runs because it isn't getting enough cooling.
Testimonial: "When I upgraded the RAM I used a vacuum to clean out dust, however that didn't fix the near constant fan use."
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