CPU usage in conjuction with RAM

I recently came across an interesting question that I couldn't answer due to my limited knowledge in the field at present. Before I get to the question, I do understand that Motherboard RAM is not GDDR, this is a question of theory.

Suppose I have a Single CPU on a motherboard. Would it be working harder if used in conjunction with GDDR5 ram vs DDR3 Ram? Whatever the answer is, could you provide an explanation please. This is merely curiosity.
 
Well, GDDR refers to Graphics Double Data Rate. RAM is used for temporary storage of data, where as the GPU processes video and then uses it's own temporary storage (GDDR) for handling data from the video. Now, if you were comparing DDR3 to DDR5 the winner would be DDR5. But here you can't compare them because they don't work for the same purpose.
 
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