Is DDR$ slower than DDR3?

[snadge]

Someone once told me that they didnt go for a DDR4 memory system setup because of the latency (and therefore the memory would be slower) - he went for a DDR3 Dual Channel system instead and overclocked it, this was on a top spec system, I may be wrong...but wouldn't it be wiser to get DDR4 Quad Channel memory and lower the timings a little if possible? - that way you have more bandwidth to the memory

edit: so my question is: is DDR4 (quad) slower on X series than DDR3 (dual) on Z series?

thanks

 

[snadge]

No I was aware, the person wanted to build "the ultimate gaming machine" and he didnt mention that he couldn't afford or didn't want the X series, I just asked why he didnt go for a quad channel (as he already had a top end dual channel machine) and that was his answer

so my question is: is DDR4 (quad) slower on X series than DDR3 (dual) on Z series?