iv ordered a vortex iv with a HD 8970M GPU but iv just seen on the PCS website they dnt do the HD 8970M anymore its been replace with the R9 M290X so i was wondering what is the difference between the AMD Radeon R9 M290X and AMD® Radeon® HD 8970M? should i get my GPU replaced with the R9 M290X as my order is still with PCS