[xubuntu] GPT support already compiled in?

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http://ubuntuforums.org – Hi, I'm looking to set up RAID on two 3T drives, they'll be RAID1 and the entire drive will be in one volume group. I'm not getting the full size, and it makes me wonder if GPT support exists in any of the pre-compiled kernels I might have access to? GPT=GUID Partition Support. I don't exactly see the option in /boot/config-3.8.0-26-generic, so maybe it changed. Maybe it's CONFIG_EFI_PARTITION? If so I'm in luck. Thanks. (Hardware)