Oh, I also specifically reset my BIOS to default. Depending on what data center they come out of, they can have some weird settings. But then there were other settings I had to figure out. There is a thread in the motherboard section of this forum about getting a 1070 to work with S2600CP and some of replies near the end talk about some of the BIOS that helped. The 1070 didn't end up working reliably, but a 950 works like a champ.