Fan keeps running.  Maybe from RAM upgrade?

I recently installed 4G of ram into my computer as the old ram was bad. I didn't notice anything for about 1 1/2 months but all of the sudden my fan keeps running. From what my istat pro says, it ranges from 3000 rpms to over 6000rpms! As you can imagine, this is very annoying. My performance isn't affected but the fan is annoying. I have 4G of 667 MHz DDR2 SDRam. I'm worried about over heating. Could somebody please help me with my fan problem?!

Thanks, I love being able to answer questions and help people

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