80C is fine. You should not have any issues with those. I'm 99% positive that you need OC options enabled to have XMP too. However, you can always try changing the setting in the BIOS to see if you're able to make the PC do the change.
Dell | Alienware Technical Support
Opening your case does not void your warranty! Check out Alienware Artificial Intelligence
I can't always reply to PM's, if you need extra assistance visit: