Hi,
I'm hoping you can help with a problem I'm having. I have a very similar system differing by using a different NVIDIA card and using a 4770 instead of 4770k.
I used your settings from your Multibeast install with Haswell and everything seems to be working fine with the exception of getting it to boot correctly.
-In bios i loaded optimized defaults, made the PCIe first display device, disabled Intel graphics and used the P0 Samsung EVO SSD boot priority instead of UEFI. I have it set to both legacy and UEFI capability instead of just legacy. It booted once perfectly and then reverted back to needing -x to boot. I'm stuck with the spinning wheel when I try without the safe mode.
I'm not certain what needs to be done. I'm guessing something in bios but wonder if you ran across this and can provide some insight.
Thanks,