Hi abcarlson and Supermuncher! Thank you very much for your input!
About the bios version: it's 1503 and that is because the board is a DeLuxe (sorry for that one).
About entering Intel bios-rom: changed 2 X 3TB hdd with 2 smaller ones than 3TB, and I got the possibility to enter the Intel-boot-rom by ctrl + i.
This ASUS P8P67 DELUXE board have these SATA connections:
4 X Intel 3gb/s connectors
2 X Intel 6gb/s connectors
2 X Marvell 6gb/s connectors
And I have these items to plug into the sata connectors:
1 X Intel SSD-510, 120GB (C: for just the system)
3 X 3TB Seagate Barracuda XT hdd's (2 X raid-1 for data, 1 X backup of raid-1)
2 X different external e-sata harddisks (1 X built in hot swap, and 1 at the front panel)
2 X DVD drives
Now, in order to make the fastest boot, and to avoid the Marvell controller (because people at the Asus forum seems to have trouble with that one) I made the following sata setup, INITIALLY:
4 X Intel 3gb/s connectors (2 X 3TB hdd for raid-1, and 2 X DVD)
2 X Intel 6gb/s connectors (1 X SSD for boot, and 1 X 3TB for backup etc.)
2 X Marvell 6gb/s connectors (2 X external e-sata connections)
After having received fine input, I changed that initial setup to:
4 X Intel 3gb/s connectors (2 X DVD, and 2 X external e-sata connections)
2 X Intel 6gb/s connectors (1 X SSD for boot, and 1 X 3TB for backup etc.)
2 X Marvell 6gb/s connectors (2 X 3TB hdd for raid-1)
After connecting the 2 X 3TB to the Marvell controller, I could easy set up a raid-1, and subsequently been formattet in Win-7, 64-bit as GPT and works fine.
But Win-7 do NOT recognise the last 3TB hdd, because I have chosen Intel Raid in the bios.
Now the last problem:
the SATA part of the EFI-bios gives me 3 choices: IDE, AHCI or RAID. and that pertains to all what is attached to the Intel boot rom.
So I have to change - and do another reinstall of Win-7 - from RAID to AHCI, and I should be HOME AND DRY!
MANY THANKS FOR YOUR HELP!
Kurt