Although I don't have an Intel x58 chipset system, I am sure, that the Intel RST(e) drivers of the v11.5 series will support it (the needed HardwareID's are present within the INF files). The Intel RAID ROM module v11.5.0.1414 will be usable too.
The only thing, which has to be investigated, is the behaviour of the x58 chipset SATA Controller regarding the SCSI filter driver named iaStorF.sys. My Intel Z68 chipset system is working without the filter driver in Win8 (the RAID0 is no SCSI disk device), that is why the Trim command may be able to pass through the RAID Controller.
I am awaiting your test results.
Regards
Fernando
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