yes, the drive controller should be set to Raid+AHCI (which is the default setting) setting it to IDE will result in the slowest drive speeds possible on the two blue SATA ports, and prevent the intel "SCU" ports from activating as the intel RST driver requires AHCI features active (why do people change settings they do not fully understand!!????)
again, the LSI 2308 ROC chip is supported in windows 10 with it's builtin driver, i do not recomend using a driver from previous windows releases
i recomend this user perform a "FULL" cmos reset to restore the correct default settings
remove power cord, press pwr button 10 sec
open side cover, and then press cmos reset button (located near cmos battery) for 5 sec
reconnect power cord, power up, enter bios and set date/time, TOUCH NOTHING ELSE IN BIOS, now restrart and confirm system boots
the only bios settings a user might need to modify in the z820 is
1. network boot -disable to speed up boot times if booting from a local hard drive
2. LSI SAS/SCSI controller, if not booting from the lsi ports disable LSI boot rom, drives will still be seen/available in windows
3. Intel AMT (remote managment) should remain disabled as this is only usefull in a corporate domain enviroment
the above settings cover almost 99.9% of a users needs the other users will have specific software/hardware where they may recomend other changes (like Avid does)
again, don't touch/change bios or software settings you do not fully understand