Information I found:
Driver support for Microsoft Windows 7, 2008, Vista, and Linux distributions
Supports up to 4 SATA 6Gb/s and 3Gb/s HDD/SSD
Supports 3TB and larger hard drives
Hot-Swap and Hot-Plug
Web-Based RAID Management Interface
Answer: It does support over 3t which it states. And Window 7 drivers work very well with Window 8. Window 8 is a upgraded version of Window 7. If driver is unsign you can still force the unsign drivers. I do it all the time. Window Vista
drivers would be a different story. If I'm you find what you want to buy then do a search of the item you want in Amazon. I do that I buy things that are new, used and refurbish all lower price.