renz496 :
series will determine which generation is newer. although not all the card inside newer series actually new card. some of them were direct rebrand. in case AMD R 200 series almost all of them were direct rebrand from previous 7k series. other than that there isn't much difference. the OC model will have much higher clock and will command a bit of premium for it. and then 'the ultimate OC model" (the matrix series) that cost much more because of the tweaked PCB and more feature baked onto the PCB for serious overclocker.
Thanks for your reply but I am still confused. I am using pc part picker and under the tabs seris chipset etc- which one should be my first preference. Is memory more improtant than core clock etc.
what is the difference between AMD, NIVIDIA, ROG, STRIX, I can't seem to find it listed anywhere.