The answer is No, this cannot happen. The source code package for the Siler BIOS, which supported the DX79SI (Siler), DX79TO (Thorsby) and DX79SR (Stormville) boards, was lost. Per notification Intel-SA-00115 for Intel® Desktop Boards (available here: https://www.intel.com/content/www/us/en/support/articles/000028718/boards-and-kits/desktop-boards.ht...):
Well, I only have to say that NVme behaves normally at full speed in this board. Despite motherboard and cpu are not PCIe3 certified, they run at nominal speed (my R9 Fury also works at PCIE3.0 without any problems). The "slowness" is just for booting.
I will leave this link to refind site, so you can advice other users. Also the refind drivers can enable UEFI GOP, and filesystem support.