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disolitude said:

All I was saying is that Xbox 1 GPU does not need a contant 150 GB/s throughput when it comes to bandwidth. 

GDDR5 RAM comes with extra power usage, extra heat, extra cost...and that Microsoft was able to maximize performance of the console without implementing GDDR5 RAM. 

Microsoft designed and built the Xbox 360 in 6 months in early 2005. If they thought GDDR5 RAM was needed after PS4 reveal, they would have made the change. Looks like the did make a change to compensate looking at this article...

I agree... they doesn't need but it will be better with.

Just to fix... GDDR5 require less power usage than DDR3 because it uses low voltage heat and cost is right BTW.