I have a Gigabyte GA-Z97X-UD5H-BK motherboard. I currently have two 128 GB SSDs and a 640 GB hard disk. I'm thinking of replacing the hard disk with an SSD. The largest SSD on Gigabyte's support list is a 512 GB Samsung XP941 MZ-HPU512T, which is no longer made. What would be the best SSD for this motherboard? I was thinking of a Samsung 860 EVO 1 TB or a Samsung 970 EVO 1 TB. I assume I may as well get a M.2 SSD as it's a similar price to a 2.5" SSD (£149.99 vs £142.43). Is there any point in spending more on the 970 EVO (£185.99 vs £149.99) with this old motherboard?