BASICS
What EVGA X99 Motherboard do you have?  151-BE-E097 X99 FTW-K
What BIOS revision are you running on? 2.08
 
What previous BIOS revisions have been tried? Whatever was stock when the board arrived.
 
(IF APPLICABLE) have the other physical BIOS’s been tested? None
 
What Operating system are you running?  Win10 64 Pro
 
Components -Internal
What specific model CPU do you have? Processor Intel(R) Core(TM) i7-6800K CPU @ 3.40GHz, 3401 Mhz, 6 Core(s), 12 Logical Processor(s)

            Is it overclocked?  Please place an X next to appropriate answer.    Yes: ()  No: (X)
           
What specific model of memory do you have? I honestly don't konw, it 16GB of g.Skill
            How many kits of memory?2
            Is it overclocked?  Please place an X next to appropriate answer.    Yes: ()  No: (X)
            If you have tested DIFFERENT memory, please supply the full model for this as well.
 
What specific model of Power Supply Unit (PSU) Corsair 1000W
            Do you actively use more than 1 PSU in your system?  Yes: ()  No: (X)
            If YES to the previous question, what exact model?
  


The only PCI slots in use are 5 for the Video Card and 6 which is disabled but showing 3x4 for the M.2 SSD
()  PCI-E 1:
            PCI-E Disable Switch in the ON position?  Yes: ()  No: ()
 
()  PCI-E 2: 
            PCI-E Disable Switch in the ON position?  Yes: ()  No: ()
 
()  PCI-E 3: 
            PCI-E Disable Switch in the ON position?  Yes: ()  No: ()
 
()  PCI-E 4: 
            PCI-E Disable Switch in the ON position?  Yes: ()  No: ()
 
()  PCI-E 5: 
            PCI-E Disable Switch in the ON position?  Yes: ()  No: ()
 
()  PCI-E 6: 
            PCI-E Disable Switch in the ON position?  Yes: ()  No: ()
 
()  M.2 Key M: (Typically used for SSD's)
            Enabled in BIOS?  Yes: (X)  No: ()
 
()  M.2 Key E: (Typically used for smaller  devices such as WiFi cards)
            Enabled in BIOS?  Yes: ()  No: (X)
 
()  SATA3/6g RAID Ports (please elaborate on RAID settings if present):
            Is Hot Swap enabled on populated ports?  Yes: ()  No: () I don't know
 
()  SATA3/6g AHCI Ports:
            Is Hot Swap enabled on populated ports?  Yes: ()  No: () I don't know
 
Video card is a EVGA GeForce 9800 GTX+ 1GB, not overclocked
 
I omitted answering these questions below in small font and italics because i do not believe they are relevant as this time.
 
Components – I/O Panel
Check the slots that are populated and provide specific of Component, brand, part number if available of the item present.
Not all slots are applicable to every board, but this form covers the entire chipset.
 
All rear IO that have multiple connectors, such as USB, are counted top to bottom, left to right.
 
()  USB 2.0 1: 
 
()  USB 2.0 2: 
 
()  USB 2.0 3: 
 
()  USB 2.0 4: 
 
()  USB 2.0 5: 
 
()  USB 2.0 6: 
 
()  USB 3.0 1: 
 
()  USB 3.0 2: 
 
()  USB 3.0 3: 
 
()  USB 3.0 4: 
 
()  USB 3.1 Type C: 
 
()  CAT5 1 (enabled/disabled in BIOS): 
 
()  CAT5 2 (enabled/disabled in BIOS): 
 
()  Analog Audio headers (standard 2 /2.1 speakers or headphones use green):
 
()  Optical Out
 
Components – Front Panel Headers
Check the components that are in use and provide specific of Component, brand, part number, or link (such as a 5.25 bay that has USB 2/3/eSATA on it) if available of the item present.  Also what are these ports plugged into?  A straight header (such as a power switch or front headphone and mic ports), or a component with its own PCB (for instance the module on the top of a CM Cosmos Case where the components are attached to a PCB with other components involved for additional function). 
Not all slots are applicable to every board, but this form covers the entire chipset.
 
At any header are you using some intermediary cabling, such as: http://koolance.com/image/cache/data/products/cbl-aw002p_p1-700x700.jpg for example?  If the system was working and can no longer power on and there is a third party cable between the motherboard and its intended device, it would be advisable to test without it being present.
 
()  Power Switch
            LED in use?  Yes: ()  No: ()
            If yes, have you verified +/- in correct place?
           
()  Reset Switch
            LED in use?  Yes: ()  No: ()
            If yes, have you verified +/- in correct place?
 
()  USB 2.0 FP Header attached
 
()  USB 3.0 FP Header attached
 
()  S/PDIF Header
 
()  FP Audio Header
 
()  Thunderbolt GPIO Header
 
 
BIOS
Have you changed anything in the BIOS?  Yes: (X)  No: ()
           Yes Just Boot order 
Is your PC running in Legacy BIOS mode, or UEFI mode?  Legacy
 
Have you overclocked?  Yes: ()  No: (X)
Have you tried resetting the BIOS, either by one of the BIOS reset buttons or by Loading Defaults from within the BIOS? NO
 
Problem description
As the title states i installed a brand new SSD into the M.2 slot to replace a 1TB spinner as the OS drive.  After following this guide (https://forums.evga.com/X99-M2-Getting-it-to-work-STEP-BY-STEP-m2476830.aspx) and some other forum posts to get the basic set up including enabling the M.2 slot. I can leave boot in legacy mode and boot to the SSD and run, and things are obviously WOW fast compared to the OS on teh spinner.  However, i cann't get the drive to boot in UEFI mode.  The breakdown occurs in that i do not have the option to enable Windows Boot Manager within the BIOS once i change over to UEFI mode.  My Boot 1 device simply states "HARD DISK"  and the only thing that shows up at the bottom of the screen is "UEFI Network Hard Drive" and it cannot be changed to "UEFI Hard Drive:Windows Boot Manager".  If i try to boot in UEFI it doesn't boot and i get an error that the video card doesn't support UEFI, which is not surprising considering it's age, but i ahve a feeling that it wouldn't matter.  The BIOS status clearly states that the PCIe slot 6 is occupied by the 3x4 M.2 SSD and it's there, but once i switch to UEFI I cannot find it as a bootable option.
 
I just realized that i also have a 151-BE-E097 board, and i downloaded and installed BIOS update for a 151-HE-E097 Board.  Both BIOS update tools seem to be for the E097 boards so i'm not sure if that is an issue?  
 
In short, i am booted just fine and running well in legacy mode, but i'd like to run the drive in the best mode possible which i'm assuming is UEFI.  I'm due for a GPU upgrade anyway so when that happens i don't want the SSD issue to be limiting boot from using from UEFI.  I'll create a follow up place holder post so i can take some pics of the BIOS settings and load them for clarity.
 
Thank you all in advance for any help you can provide, it is greatly appreciated.
Chris

Assuming the X99 has a UEFI BIOs then perform the following if UEFI is set in the BIOs. Make a complete backup first that can be restored in case something goes horribly wrong:
 
 Search for Command Prompt in the Start Menu, right-click on it and select the option “Run as administrator.”
 
In the command prompt, execute the below command:
 
shutdown /r /fw

Windows will show a warning message saying that the system will restart in less than a minute.
 
Close the warning message and save all your work. The system will automatically restart and boot into UEFI mode.

Did you follow the "BIOS Setup and Windows Installation for M.2 and PCI-E NVMe SSD's" on page 19 of your mobo manual?
 
 Also, yeah, cloning could be (is probably) the issue for sure.

 
Q: Can I move data from an HDD or SATA SSD to a Samsung NVMe M.2 SSD?
A: Yes. It is possible to clone a SATA HDD or SATA SSD to an NVMe SSD. Samsung, however, recommends performing a “clean install” of the OS and later transferring the desired non-executable files.
Because the registry information needed for NVMe SSDs is different from those of SATA HDDs or SSDs, a clean install helps to avoid unnecessary compatibility and performance issues that may arise from simply cloning a storage device.
 
Samsung SSD Troubleshooting and More
 
 Good luck with it.
 
 

You don't see the SSD anywhere in the BIOS?..Not even in "Hard Disk Drive BBS Priorities" where you could select it?

I dunno, man..You might read through the links below and get some ideas..Or do a forum search for "X99 SSD" and you'll get some hits.
 
UPDATE: X99 Classified BIOS doesn't see my M.2 SSD (fixed in post #34 and #39)
 
How do I install Windows on an M.2 NVME Drive?