You are ONLY looking at the high sequential speeds of the 6GB/s results, those ONLY matter to benchmarks not actual performance or how the system feels. Intel is the best ports to use your SSD on, they are faster overall, and far more stable, see my C300 review here for a in-depth comparison
http://forums.tweaktown.com/storage-devices-methods/41812-crucial-realssd-c300-128gb-single-vs-raid-w-marvell-ich10r-hpt-rr-640-review.htmlFor reference, other advice he received about this
http://forum.crucial.com/t5/Solid-State-Drives-SSD/Crucial-M4-amp-Gigabyte-P55a-ud3-SETUP-ADVICE-Mixed-Results/td-p/86142To enable RAID in the BIOS, you need to enable RAID in windows first, here's how. This ONLY applies if you have NOT installed Marvell drivers and are using MSAHCI driver, if you have Marvell drivers installed you'll need to uninstall them and reboot into windows to get MSAHCI loaded first.
Enable switching between all IDE/AHCI/RAID modes by changing "Start" Values in these keys to 0 (Win 7 / Vista ONLY)
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Msahci\Start
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Pciide\Start
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\iaStor
V\Start
I advise you put your SSD into the first Intel port SATAII_0 (Top blue, bottom port against the PCB), then any other hard drives on the Intel ports following that numerically. Then put your CD/DVD drive on one of the last Intel ports SATAII_4/5. Then enter the BIOS and set Marvell controller to disabled and you'll be all set