ok this inspired me to do some testing myself.
Rig: Rampage Extreme Motherboard
2X Seagate 500Gb 7200 32MB Cache
Results:
Standard Single Drive: Average: 98.2 MB/Sec
Asus Speeding HDD No driver install: Average: 112.6 MB/Sec
Asus Speeding HDD with Driver Install: Average: 56.1 MB/Sec
Raid 0 128KB Stripe: Average 158.6 MB/Sec
Conclusion! Asus Speeding HDD is shite lol