Hello,
We have a Windows 2012 R2 server on a P9D-X (Intel C222 chipset).
2 x Raid 1 working fine (BIOS configured).
Unfortunately, we can’t install the GUI (Intel Rapid Storage Technology Enterprise - IRSTe).
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If we install the latest IRSTe we get the message that the setup will downgrade the driver.
Version: 3.8.0.1111 (Latest) - Date: 30.11.2013
https://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&DwnldID=23257
The parameter doesn’t prevent the message:
IATA_CD.EXE-nodrv 
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The version doesn’t work with Windows2012R2
2.9.0.1001 (Previously released)
Date: 12/12/2013
https://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&ProdId=2101&DwnldID=23496&ProductFamily=Software+Products&ProductLine=Chipset+Software&ProductProduct=Intel%C2%AE+Rapid+Storage+Technology+(Intel%C2%AE+RST)&lang=eng
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The non-Enterprise version (RST without e)
Version: 13.1.0.1058 (Latest) - Date: 05.27.2014
https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=24006&lang=eng&ProdId=2101
Produced the same error message:
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This driver works error free for about 6 month on the server: 
Please help !
Tom