Z77 Extreme 4 NVME PCI-E SSD BOOTING!

You can boot Windows from NVME on any 64bit mainboard without NVME support if you install the rEFIind boot manager with the NvmExpressDxe.efi driver on usb stick and boot it. Refind can then chainload windows or any other OS you have installed.

That said, I installed the NVME on a z77 Extreme 4 mainboard without needing the usb stick solution.

This is what I did.
- Flash the 2.90P beta Bios.
- Install the NVME hardware
- Boot into windows to let it install the driver and check that nvme works.
- Convert the windows boot disk to GPT (in case it is MBR).
- Disable CSM in Bios/firmware setup (in Advanced->ACPI configuration). You should never need it again as the system is now GPT.
- Install the free version of Macrium Reflect and clone the entire boot disk to NVME. Note it is possible to resize the windows partition while cloning to fill the disk, but every time I try, I have to work out how to do that. Reflect is not very intuitive with this.
- After the clone, SHUTDOWN and unplug mains. DO NOT REBOOT until you have physically disconnected the old boot disk. Having two clones of the same OS during boot can seriously confuse windows.

I am not 100% sure the GPT/CSM steps are required, but it worked for me.

For anyone trying to get this old motherboard running witha NVME:
I doesnt have to be a Samsung Evo 9XX or anything.

Try this instead, worked out perfektly for me using the 2.90P Bios with an old NVME taken from a Lenovo C340 (without any boot option like the Samsung) and the cheapest adapter from Aliexpress.

https://www.youtube.com/watch?v=sxX0RtX5e6g

Written down and more advanced check this site:
https://winraid.level1techs.com/t/howto-get-full-nvme-support-for-all-systems-with-an-ami-uefi-bios/30901


Rename the Bios to *.rom to change it, rename it afterwards back and put it to an Fat32 USB Stick, then use the instant flash with F6 at start. The Asrock Bios is dumb enough to not recognize th changed BIOS