Hi,
just applied this update to my AMD board the GA-790XTA-UD4. At the moment I only have one Western Digital Hard-drive attached to the controller and there has been no significant improvement to throughput on it.
Not sure how it will go with a RAID array or SSD and not sure if I really want to be bothered with too much testing.
Something to bear in mind when you do update the Firmware, make sure you have removed any devices attached to the controller or the update can't take place. There are 7 sections that are flashed during the process and, for some reason, it wanted to flash sector 3 first.
Hope this helps