well,there are a lot of posts about it,switch to b120i raid mode(even if you don't do raid),set every disk to raid0(each alone),because in ahci there is no way to read temperatures from drives(yes i know sw can do it from smart,but not this way),and then install with raid drivers(it might be possible to switch to raid without wiping drives,actually it is THE way,but do test it before,enabling raid0 just writes some header on unused part of disk,maybe at the end,so partition might need realignment,backup,always have backups :) ),but there should be no reinitialization(going from ahci to raid0 single drives)
also don't forget to set boot drive in raid admin
