Hi all - I'm hoping the following bit of information will save you some potential grief and headache,...
-Just replaced a CHVF that I killed with a CHVFZ and had no issues with the change-over, but afterwards,.... while I was cleaning up my OS by uninstalling unwanted software, I came across an installation named something like "ATI Driver update suite". Thinking it was some AMD video driver updater (I use Nvidia) I went ahead and deleted it. After the un-install, I was prompted to re-boot, which I did.
What I deleted was the AMD chipset drivers for the mobo, which in turn utterly disabled all of the USB ports on the board while in the OS. This meant no mouse or keyboard once the system started booting into the OS.
To make matters worse, I didn't have any backups or restore points which included this particular driver set. There is a legacy PS style port for keyboard/mouse on the CHVFZ, but it requires an adaptor to get both devices working on the one port (not included with the mobo), and that adaptor most likely doesn't exist within the borders of my state.
Ultimately after exhausting every possible lead to a fix, I ended up completely re-installing my OS in order to get the AMD chipset back into the OS again, which meant a huge update & patch session, downloading and reinstalling all my favorite little bits of software & games, etc, etc.
What I've learned in summary;
Don't delete it unless you know exactly what it does,
Back up EVERYTHING and OFTEN
My Sig Rig's current list of ingredients;
AMD FX-8350 @ 4.46ghz (everyday O.C.)
Asus Crossfire V Formula Z mobo
2x EVGA GTX-760 SC 2gb GDDR5 video cards in SLI configuration
16gb Gskill Ripjaws 1866 memory
Raidmax RX-1000AE Gold Cert modular 1000w psu
Asus Blu-Ray/DVD R/W optical drive
Crucial 128gb SSD
2x 500gb Sata HDD
Corsair HCH60 AIO liquid CPU cooler
3x 140mm fans - top, side
3x 120mm fans - front, rear
NZXT digital touchscreen fan controller
NZXT Source 210 White mid-tower case (Would you believe this case is only $39.99 at www.newegg.com?)