DementC

Yes I did read on that, the PC is currently running on W7 with no way to disable "Secure boot" from the BIOS option. Although there's an option for me to upgrade to W10, I don't think changing the OS to W10 will make the disable "Secure boot" option BIOS appear on the BIOS. Unless you're telling me it does, then I will gladly update my OS. Seems like only PCs that are factory shipped with default W8/W8.1 have the option to do so. Also, I can't seem to find any BIOS update for the mobo.

Background: I've DIY-ed a number of full systems before, both for my friends & myself. So I've a friend who approached me to upgrade his Acer Predator G3620. So I recommended an ASUS Strix 970 & a Seasonic M12II EVO 620W PSU to power the card. After installation, we found out the stock mobo doesn't support the graphics card. So I kinda need some help to see if an Asrock H77 Pro4-M will fit into his currect casing. Imgur link of side view: http://i.imgur.com/c065bwl.jpg?1 Imgur link of back view: http://i.imgur.com/qz9ZGme.jpg?1 Note1: Mobo doesn't support the GPU because it couldn't supply enough auxiliary power using a 4pins. Modern mobo uses 8pins. Note2: Online sources says the stock mobo is ATX, but I highly doubt so. Note3: Seems like the 4pins doesn't seem to be the issue. Note4: I tried to find a BIOS update for the stock mobo during the day of installation but to no avail. TL;DR: Will the casing be fit an asrock H77 Pro4-M?