The latest BIOS for your board is actually F6 and you can safely update to this version as it should include the RAID ROM Update.
If you are going to use the e-SATA header on the Chassis (it looks nice) you might encounter a few problems. AHCI, in theory, allows hot-swapping of devices but there have been several posts on the forum of it not working in the manner expected. It seems that, if you connect the e-SATA header to one of the SATA ports on the motherboard, then any attached devices will only be properly recognised if they are switched on before you BOOT the system. I have no first hand experience to confirm this though.
Another issue that can sometimes arise is a problem with DVD/CD drives not being recognised when attached in AHCI mode. Looking through the Manual for your Mobo, if I was setting it up under the heading Integrated Peripherals I would:
1. Set OnChip SATA Controller to enabled
2. Set OnChip SATA Type to AHCI
3. Set OnChip SATA Port4/5 Type to As SATA Type
4. Set OnChip SATA RAID5 Support to enabled (you said you want to use RAID 5 so this needs to be set)
5. Set OnChip SATA3.0 Support to Disabled. (At the moment you don't have any SATA3 devices and this can be changed in the future when you upgrade HDD's)
6. Set Onboard SATA/IDE Ctrl to Enabled
7. Set OnBoard SATA/IDE Ctrl Mode to IDE (Connect your DVD/CD Drive to one of these ports)
8. Set Onboard SATA/IDE Mode to IDE
@absic, hope I didn't mumble the wrong incantation by admitting to only now switching to AMD?
Would it help if I said you got a cool avatar? I'm thinking, that's either Kaukonen or Brombeck? Sure I've seen it, or something very similar before. Well, either way, definitely a sign of very good taste.
No problem with you only just switching to AMD. Welcome to the light side.
My avatar is one that I designed, quite a long time ago, as a logo for myself when I was a professional musician. Pleased you like it1