Yes, my fellow X79 friends, the day is finally upon us. As of yesterday, Intel released new RSTe drivers that bring TRIM to RAID 0/1 SSD configs (let Win 7/8 TRIM commands pass through the Intel C600 chipset storage controller)! Best of all, no OROM update (and accompanying BIOS flashes) required! At least I didn't for my ASRock X79.
I verified with this TRIM check tool. With the old RSTe drivers, the tool indicated that TRIM was not working on my RAID 0 array. After installing the new drivers and a reboot, it indicated that it was.
As they say, better late than never... Anyway, I bet the 3 other people that use SSD RAID on X79 that read TR will be interested in this.
Thanks to this forum post for the heads up.