MSI X99S GAMING 7 - slow booting; HDD aren´t recognized in BIOS

Hi,

i´m facing a similar Problem as it is described in  "MSI X99A Gaming 7 and Samsung SM951 PCI-e very slow boot time" https://forum-en.msi.com/index.php?topic=255919.0

My rig:
- i7 5930k
- X99S Gaming 7 (BIOS h90)
- PALIT GTX 980 Super Jetstream
- OC...