I was thinking about getting 2 7970's, but I read somewhere that with the 2500k it would bottleneck is that correct ?. as for overclocking I would love to have a go at it but not sure how. I have a gigabyte GA-Z68X-UD5_B3 motherboard, I did try using the easytune software but it would always fail, but that isn't overclocking properly, it all looks rather intimidating to me