Will the memory frequency affect the speed of a gtx 970? because when I was buying the guy who was selling me told me to buy a 1866 frequency memory instead of a 1600 that I was planning to buy, He told me it will affect the speed of the GPU. I know that the 1866 is faster than the 1600 one but will it actually affect the GPU speed in anyway cause from my understanding the GPU memory is separate from the the cpu ram.. Is he actually telling me the truth or simply wants me to buy a much expensive memory? cause I see in youtube budget builds with only a 1333 or 1600 frequency memory only some are actually ddr2 help please.. and thanks for enlightening me 
