You problably mean "without issue" regarding the BIOS modding procedure, but not regarding its daily usage while working with an Intel RAID array.
Just to avoid any misunderstandings:
A) Compatibility of Intel RST AHCI storage drivers with X79 chipset systems:
- The latest Intel RST AHCI driver, which natively supports the "Intel(R) C600 Series Chipset SATA AHCI Controller" (DeviceID: DEV_1D02) is v13.1.0.1058 WHQL dated 05/02/2014.
- All Intel RST AHCI drivers up to the v15 platform can be installed onto Intel X79 chipset systems with a DEV_1D02 Intel SATA AHCI Controller, if the installation has been forced or if the missing HardwareIDs had been manually added to the *.INF file.
- The Intel RST driver v13.2.8.1002 dated 07/09/2015 is the latest from the v13 platform and works fine even with Intel RST SATA Controllers, which are natively not supported. According to my own tests it is the best performing Intel AHCI driver and recommended for all Intel chipsets up to 100-Series.
B) Compatibility of Intel RST/RSTe RAID storage drivers with X79 chipset systems:
- The Win10 v20H2 in-box Intel RAID driver v15.44.0.1015 dated 02/08/2018 is currently the latest one, which natively supports all Intel RST and RSTe SATA RAID Controllers (DeviceIDs: DEV_2822 and DEV_2826).
- Due to the not matching chipset specific internal DeviceIDs of the Intel RST/RSTe SATA RAID Controller I recommend to avoid the usage of the Win10 in-box Intel RAID driver while working with an old Intel chipset system like the X79 one.
According to my tests with different old Intel chipset systems running in "RAID" mode the Intel RST RAID driver v13.2.8.1002 in combination with a v13.2.x.xxxx Intel RAID BIOS module seems to be a very good choice for Intel X79 chipset RAID systems.