I am looking for an inexpensive video card for a new build. My budget is roughly $150. I am looking at the Sapphire R9 270 and the Sapphire R7 265. Both are around $160 at Amazon right now. Is the 270 much better than the 265? Are both good overclockers? I am looking to play a backlog of older games with the card (games 3-6 years old). Is one clearly better than the other for that purpose?