I have found PCs to be very system/component dependent. Like I/Cs, they can alter the "sound" of a system. Sometimes not positively. What sounds good here may not sound good there.
Keeping this in mind, if you want the final word in performance from your system, by all means, try them. But be prepared to experiment.
Keeping this in mind, if you want the final word in performance from your system, by all means, try them. But be prepared to experiment.