Try this: http://nirsoft.net/utils/blue_screen_view.html
It shows up the bluescreen and mybe indicates the problem ressource
(ASUS is sometimes not the best vendor....especially the bios'es are not very well tested. I wait for a funktional bios since over a year..random bluescreen or hard resets)
On case with an Asrock board, there was the Board/Controller/internal RAM broken. I only get Bluescreen with activated Cache option.
An easy test (benchmark) tool is CrystalDiskMark.Test the RAID5 volume with (de)-activated Cache and PreRead Options. Maybe there is the problem hidden.