ASUS paired the P8Z77 WS board with a UEFI (Unified Extensible Firmware ASUS paired the P8Z77 WS board with a UEFI (Unified Extensible Firmware Interface) style BIOS developed by AMI and customized for additional feature support by ASUS. The UEFI BIOS offers full keyboard and mouse support while using the BIOS pages. By default, the user sees the EZ mode screen when entering the BIOS with the Advanced mode screens accessible via the Exit/Advanced Mode button at the upper right corner of the screen. Advanced mode screens can be set for the default user interface via the BIOS Boot menu as well. There’s really nothing at all not to like about ASUS’ UEFI BIOS implementation. In my honest opinion, they have one of the best implementations of UEFI on the market currently. The BIOS is very responsive to both keyboard and mouse input with no lag or questionable click-space evident anywhere. It is intuitively laid out so that both novice and advance BIOS users can easily find what they are looking for quickly with the EZ Mode screen laying out everything in a highly readable format, while the Advanced Mode tabbed layout displays as you would expect from a traditional (read old-school) BIOS. ASUS even gives you their brand of tools and applets in the BIOS from an in-BIOS updater (EZ Flash2) to their full BIOS profile load and save utility.