^ That right there is why I am happily still running my 16GB of 1600mhz corsair ddr3 ram and not carrying to upgrade at all to DDR4.
Well....I'd have to get a new mobo / cpu / and ram and frankly I dont care, or have a need to do that. I can play whatever I want at 1440p perfectly fine most of the time maxed out (or atleast almost there) with good 60+ FPS in most games that I play.
But meh...RAM pricing is getting stupid high for DDR4 and DDR3 is still higher than normal because of people like me who haven't moved (or needed to) towards a new mobo / cpu / and ram.