Another awesome post from Dell Software Development Engineer Paul Marquardt. He published a blog, how to create Windows 8 / Windows Server 2012 bootable USB media for deployment on UEFI based systems.
I would highly suggest you to read the blog. You can find it here.
Like you saw in one of my last posts, which BIOS Settings you have to change for maximum performance on Dell PowerEdge 11th Gerneration, you can do the same also in 12th Generation.
First reboot the server and press “F2” to enter the “System Setup” and click on “System BIOS Settings”
System Setup Dell PowerEdge R620
In BIOS Main Menu please click on “System Profile Settings”
Dell BIOS System Profil Settings
Set System Profile please to “Performance”
System Profile Settings
Now click on “Back” in the lower right corner.
Back in the main menu click “Finish”.
In the popup box please click “yes” to save changes.
If you see the “Green Box” you can click “OK” and restart your server.
Dell BIOS Changes were saved