There is no Realtek driver about Xonar STX, you need to download a driver from Asus support site - particular Xonar STX Win 8 driver:
http://support.asus.com/Download.asp...e+STX&p=21&s=3
IRST stands for "Intel Rapid Storage Technology" - a set of Intel ICH/PCH drivers (a disk controller):
http://downloadcenter.intel.com/Sear...l%C2%AE+RST%29
Again - with Win 8 you do not need W7 drivers that are on the official website of Bloodrage. You may install Win 8, use all built-in drivers supported, and download from manufacturers' sites (like the two links above) only drivers providing additional functionality.
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