I am planning on getting an Msi gtx 970. The two versions that I was looking at were around $50 apart. One was factory overclocked and the other wasn't. I am wondering if the the factory overclocked version is worth getting if I am able to achieve the same speeds overclocking manually. Can the factory overclocked card be manually overclocked further, or is it just for people who don't want to manually overclock. Thank you in advance.