if i set up raid 0 with 2 different Performance level drives?

i have a wd 3200AAKS- 00B3A0 320gb 16mb cache, 87mb avg. read and a wd 2500YD-01NVB1 250gb 16mb cache, 58 mb avg. readso if i raid 0 these will i gain performance (speed in mb/sec) they are both sata ll 300

No, you will most likely lose speed.I believe you can only read/write with the speed of the slowest drive.