Macbook Pro 2012 overheats with Diablo 3

I just bought the new 2.6GHz 8GB RAM Macbook pro (non-retina) last week, and the machine overheats horribly when I try to play diablo 3 (even on the lowest settings). It runs fine for a couple minutes, then the aluminum becomes so hot that I cannot even hold my hand on it for 30 seconds. Also, the game begins to lag terribly. This overheating problem occurs during some regular internet use also and slows it down to the point where it's impossible to watch YouTube. I know it isn't my wifi connection since I run the same things on my iMac in the same room (not at the same time). Am I doing something wrong? Thanks in advance!

My new 15" MBP (Same specs are yours) runs Diable 3 fine. Everything is turned up and it's very fluid.  I rest my MBP on a cooling pad to help with the cooling.  Mine does get hot, but I have played it for several hours with no lagging/stuttering (Caused by excessive heat).
Your MBP will run Diablo just fine (And WoW for that matter. I have everything set to Ultra and I push ~35FPS in SW.)
Instead of troubleshooting it, I would make an appointment with the Genius Bar, or if you don't have an Apple store close by, give them a call.  There is something wrong with your MBP.
Hope you get your MBP fixed quickly

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    Hi guys,
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    This is the RAM I bought:
    http://www.ec.kingston.com/ecom/configurator_new/partsinfo.asp?root=&LinkBack=&k tcpartno=KTA-MB1600/8G&id=2
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