I've got a computer with a motherboard which has the following text as product information on the invoice:
Asus P5QL Pro Sockel 775 Intel P43 max. 8GB DDR2-1066 ATX 1xPCI-E 16x 3xPCI 1xUDMA/100 6xSATA2 RAID 0 10xUSB2.0 GB-LAN 7.1 Sound
The computer has two identical 500 GB drives:
Seagate Barracuda 7200.12 ST3500418AS 500GB 3.5" 7200U/min 16MB Cache SATA2 intern Bulk
I've been told that I can "set RAID 0 in BIOS". But nothing the motherboard manual, or on the motherboard website, nor when I press DEL:

nor when I press ALT-F2:

mentions anything about RAID.
On the download section (thanks mterwoord), I downloaded the Storage Manager:

But I'm not sure what I need to do with this exactly to be able to set up RAID.
Here's my BIOS startup screen options, @mterwoord I don't seem to have a CTRL-D:

In BIOS (F8), I was able to switch the drives from IDE to AHCI, but upon rebooting it doesn't give me a new Storage Manager option, just the same DEL, F8 and ALT-F2. When I go into BIOS (F8), I can now get to AHCI Settings but there is nothing there about RAID:

When I try to install Windows 7 again, it still recognizes two drives, so I assume RAID isn't set. All I am trying to achieve is to make my system faster and I understand that RAID 0 will do this. Will the fact that I have AHCI set give me a speed increase without explicitly setting RAID?
How can I set up RAID 0 on a ASUS P5QL PRO motherboard?