before this i've had 2 pcs 80gb 320 series ssds in raid 0 in my desktop and the r/w speed were what it supposed to be but when i added another ssd to the array the performance doesnt seem to increase as much as i thought it would be. does anybody know what i did wrong here? can anyone help me. any help would be very much appreaciated thanks.
Please note that the answer is yes, if you add another ssd in a raid 0 raid array, you should detect an increased performance of at least 33%, but this will directly depend of the type of raid controller that you are using, if it is software based or hardware based controller.
I suggest you to contact your system or raid controller manufacturer for further assistance on performance.