I think they got lazy on the card v-bios like I say google z68 with gtx 970 and read up on all involved what worked and did not there were some boards guys found they were 100% SOL some worked out of the box some a evga card did not work but a MSI card would , crazy... then if you look most used a sandybridge as well then like you see some boards if you had a sandy they foot noted the newer bios not to use them if you don't have a ive ? so??
I guess like this one ?
''* MSI recommend you to update BIOS with ME8 only if you are using IvyBridge 22nm CPU.
* There is no way to reflash back to ME7 if you already updated to ME8.
https://www.msi.com/Motherboard/support/Z68AG43_G3.html#down-bios I guess its own risk to try to use them if a later bios was needed for any new card support and you had a sandy ?? all I know was a lot of guys fighting a 900 card in to make them work
good luck