Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
Your motherboard can split the x16 from the CPU into two x8 slots (two slots! not x8/x8 in one). That's the full extent of its bifurcation abilities (bifurcation requires extra hardware, it's not just a firmware thing). So you can add two m2-pcie cards using two passive adapters in two slots...
In olden times the HD light was driven by a disk controller. Some M2-PCIe adapter cards have pins for connecting the case LED. Otherwise it's entirely up to the motherboard to generate it (or not).
Depending on how strict with terms you want to be...340x0 cards could be used for 3D acceleration. Since they were full fledged CPUs, they could do 3D even if lacking dedicated 3D functions.
It's a shame that the optical audio port has never been updated. It's stuck in the year 1982 forever. But still beautiful because of the electrical isolation.