Hi Mike C,
I'm using:
Asus Rampage V extreme running BIOS 1701 with Intel i7 5820K and 16Gb RAM - confirmed latest bios.
http://www.asus.com/uk/Motherboards/RAMPAGE_V_EXTREME/HelpDesk_Download/
Windows 10 64 bit, fully updated
- Power management set to power down HD's after 15 minutes.
Intel Chipset SATA RAID Controller driver version 14.6.1.1030
Intel Rapid Storage Technology 14.6.1.1030 (*note, also tested with 14.6.0.1029)
- Link Power Management is Enabled
- Write Cache buffer flushing is Disabled
RAID 10 array
- 4x HITACHI HDP725050GLA360 firmware GM4OA5CA / GM4OA52A
- Write-cache buffer flushing: Disabled
- Cache mode: Write through
Thanks for your help,