Originally Posted by OCmember
We discussed this on the EVGA forums under the X58 section and they can't make the bios into a UEFI bios for PCIe drives to boot. Apparently there isn't enough storage to write the info.
That must suck for EVGA users then. My Rampage III boots a RevoDrive X2 off the PCIe slot just fine. The only problem I had was all other sata devices had to be removed for it to show up in the BIOS, lol which was no problem as everything can be stored on the Home Server over Gigabit Ethernet. My Father has been booting his RevoDrive since 2011 on his x58 no problems either. Oh and we tried the SM941 and my Rampage x58 does not see it what so ever, go figure. I went back to SATA a long time ago myself, using three C300's and three 850 Pro's in RAID0. I wouldn't mind trying the Predator though since its known to work on x58.
I wont go back to PCIe booting until I get either Skylake or Kaby Lake to replace this Rampage III.
P.S. UEFI is only needed for NVMe based SSD's because it is an entirely new and extra module that must coexist next to the AHCI module (UEFI drivers). Legacy BIOS in theory works just fine for PCIe SSD's based on AHCI, as AHCI is already built into every known BIOS for x58 and before. However, for the PCIe SSD to show up depends on when the BIOS was written and if consumer based PCIe SSD's existed during the time that the BIOS was being written. No reason to write in code for something that wasn't yet introduced to the normal consumer market. No extra space was needed in the BIOS to allow a BIOS to "see" PCIe storage devices based on AHCI. The extra code needed would have been minuscule at most.Edited by }SkOrPn--' - 1/28/16 at 4:14pm