This is the UEFI install.
A. to obtain windows 8 pro ISO:1. to recover the product key, use
Belarc Advisor2. use the key to download the ISO with
Windows8-Setup.exe3. create w8 installation usb stick: just format the stick with fat32 and copy all the contents from the ISO to the usb stick.
B. download the latest drivers from ASUS.C. prepare your SSD: upgrade the firmware if needed
D. set up your bios- make sure that AHCI is selected in your Bios > Advanced Boot > SATA Configurations. Disable Secure Boot Control and Enable Launch CSM.
E. fresh windows installation- take out your stock HDD. put the SSD into the bay that houses stock HDD.
- plug in the usb stick. boot your laptop, and spam the esc key when you see the POST screen with ROG logo. a popup menu should be up and choose the option with 'UEFI:
' and continue. reorganize your HDD partitions if you want.
- make sure you take out your installation media upon first reboot. if your windows failed to boot, check and make your SSD the first boot option in bios. normally it will boot straight away, because it's now the only bootable source in your system.
F. driver installation
- install the drivers. multiple reboots are required in this stage. for w8, you only need a minimal set of drivers.
a) intel chipset; intel rst; audio; graphic; atheros lan and wifi (check your hardware in device manager for confirmation)
- make sure ATK Package and touchpad drivers are installed.
edit: if you have bought your w8 pro via w8 upgrade offer, there is an email (receipt) from Microsoft that has your product key. a brief instruction to download w8 from Microsoft is in that email, too.