MarkJohnson, at this point there are not drivers available for Windows 8.1 yet, since this is a preview version, not a production version of Windows. Drivers are provided for production versions of validated operating systems; therefore, Intel does not provide support or drivers.
We have no date or other information to provide regarding the release of these drivers. However, once they are available, they will be share immediately.
In the mean time you may want to search with the video card manufacture if there is a firmware update available for it.
hmm, I'm not sure how to answer this. lol
The problem isn't with Windows, it's with the BIOS on the motherboard. Possibly with the firmware of the video card, but since it was working fine with BIOS version 16 for a minute, I assume it is a BIOS issue.
I'll check evga and report back if there is a new one and if it fixed it or not. otherwise I'll assume it's a BIOS issue.
My DB85Fl board also have the same issue. I tried all the https://communities.intel.com/thread/44769.
above methods for nearly 1 week and nothing works for me. I sent back the board to Intel for replacement.
The issue was reported 2 months ago by many customers but Intel didn't release a proper bios to solve this issue.
DB85Fl and DH87RL have the same bios issue. Solve this quickly, otherwise you will receive a lot motherboards for replacement.
I installed the video card and getting video detected error. So turned off the primary onboard video. Then installed the video card. Then the board stucked up there with no video error beeps.
I update the latest bios using recovery method. But still getting the error. Intel people accepted that there is a problem with Bios and we couldn't reset or clear.
Video cards doesn't have UEFI Gpu. So you have to change from UEFI boot to LEGACY boot in BIOS before installing a graphic card.