How Large Internal Hard Drive Added to XPS 8700?

XPS 8700 Desktop
Latest Bios
Win 7 64-bit

1) I want to add a second drive, a 5TB storage drive, into a XPS 8700. How large of an internal hard drive can the XPS 8700 accommodate?

2) The boot disk is MBR, this 5TB storage drive will be GPT. Do I need to keep each partition of the 5TB drive under 2TB or can I exceed that size for any one or more of the partitions?

Thanks