Question Raid Controller Compatibility


I'm looking to use an old prebuilt as a NAS and I want to know whether I will have any compatibility issues with a pcie raid controller card on such on old system. It's an HP Compaq Pro 6300 SFF with i5 3470 and some Q75 Express chipset motherboard. I'll probably just run two drives in raid 1, using something like this:

I'll be using freenas, and I'm also wondering if I can install a raid controller and second drive after freenas is up and running, and whether it is okay ti mix 5400RPM/7200RPM drives or different brands in raid 1.
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