I am using a 970A-UD3 v1.0 with Hybrid.
I use W7, XP and a Linux (a month) on it
Tried Ubuntu ,Kubuntu ,Mint ,Simply Mepis and Open SUSE (mostly KDE stuff).
I also have on a MSI FM2 mobo a dual boot of Linux-es ,the board having UEFI .
So you can have them both ,XP and Linux, but i recommend you to play with an empty HDD until you discover the optimum partitioning.
You should use a
/boot partition as primary so the Grub goes in there , so you have no issues ,no matter if the partitions used for the OS-es are logical or primary.
Keep in mind Linux Mint may not allow you to install proprietary GPU drivers properly, you will use the default Open GL ones.