Hello,
When you said two ssd card, you mean two hp z turbo drive or standart SSd disk connected to the motherboard?
If they are standard ssd, they are connected to which one of the below sata connector:
If they are connected to sata, try to update the Intel rapid storage:
The option to disable SAS controller is available on Security menu --> Device Security (you can do it from hp performance advisor, the station must be rebooted).
You can also disable all unneeded Option rom from the Advanced Menu --> Device Option (you can do it from hp performance advisor, the station must be rebooted).
I propose also to set Idle power saving to normal instead extended Power Menu --> OS Power management (you can do it from hp performance advisor, the station must be rebooted).
Best Regards