Decided to try SLED 12 (need a stable nix environment, and as yet haven't been able to find one for workstation use), and finding that boot hard locks on initd. This occurs on SLED, openSUSE 13.1, 13.2, Fedora & CentOS no matter what, and have been able to work around it on other distro's (Mint, Antergos) by setting nomodeset and gfxpayload = text, with working natively with Sabayon & Mageia.
I'm assuming its related to the 750 ti and a novaeu driver conflict (rest of specs are asus x99 deluxe, 5920k, 8gb ram, 256gb ssd for reference).
Anyone any suggestions on getting past this? I assume I need to get grub to respect to put itself into VESA mode, but I have no idea why it isn't respecting nomodeset and gfxpayload.