I am purchasing an HP DV6z Laptop with the dedicated 7690 GPU. Is it worth the 75 dollars to upgrade the APU from AMD Quad-Core A6-3420M Accelerated to AMD Quad-Core A8-3550MX Accelerated. The laptop will be for general use with some MMO gaming, mostly Rift and some WoW. Will the processor upgrade make a noticble difference in performance or should i stick with the A6. Thanks. Spidz.