Oke i can understand, the point is they are not necessary for upgrading, right?
But which one of them is the best? I mean the best for gaming?
IMHO, if you read the comparisons via the first link, they are both identical they average the same and in that case if they are identical then I would go with the cheaper solution.
At this point its like comparing Granny Smith apples to Golden Delicious apples.