I upgraded my MacBook Pro mid 2010 model from 4GB to 8GB of RAM. I noticed a big improvement with performance. One thing i noticed was that the only time I noticed the fan getting really loud was if I was exporting a movie in iMovie or playing something like Left 4 Dead 2 via Steam. I'm sending the RAM back to Crucial due to Kernel Panics and they're going to send me a replacement..which means that I have to put the stock 4GB of ram back in. Now it seems like my fans get really loud for basic things like watching a YouTube video in 720/1080. Not to mention, it seems to get a lot hotter now. I'm sure my MacBook Pro is fine, but I'm just wondering if the reason why my MBP gets so loud is due only 4GB of RAM compared to previously having 8GB. Thanks for your replies in advance.