Bios settings over my head

UncleDaddySwiss

Distinguished
Feb 2, 2014
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Ok, coming right along, but stuck again. Finished build, but now I'm trying to set BIOS settings, and I swear, the Mobo manual is good for absolutely NOTHING. I have Click Bios 4, Version E7845IMS, thats what it says at top. MSI Z87 GD65 Mobo.
I'm trying to set boot priority, and the icons arent very clear. Some of them appear to "light up", while some others have a "U" in a box over the icon. Others are just the icon. What does it mean when it is lit up and what does the U mean?
Also, what should the Boot Mode Select be set to?

And, why is my SSD shown as SATA2? I have it connected to a SATA 3 port.

Might as well add this too, My mobo has a 2 digit debug code LED and the code is a constant "66" which in the manual states its "Late CPU Initialization." However, its been running over 2 hours (just in bios) but seems fine to me. What gives? Again, looked in manuals, and all over web.

Anyone know what the normal constant reading would be if everything is running good?
Thank you.