first of all the the raid that you want is called Raid 0 or stripping mode. You need to have some sort of controller in order to do this. Most motherboards have them or you can get a sata raid controller. Does yours?
Second you need 2 identical disks. They need have the same model manufacture and size work properly.
Third, in my experiences you don't get much performance difference out of them unless you are running a raid 5 system which has like 20 hard drives in it. Although its still fun to play with.
If you want speed i would go with the Western digital raptors. They are fast as hell. And get a standard sata controller. if you don't have one.
Supporting AMD with your breakable stuff.