Why come here and ask a question if you dont like the answer and ignore what people offer? The answer is it does matter which slot if you care about performance. If you dont care then plug it in where ever you want.
He said that it would be faster because some motherboards only have 2 x16 slots. Newegg listing is wrong and says all of them are, and then immediately says only 2 are in the unsortable parenthses in the specs. TY rockyjohn for pointing that out.
Going in the second one since the memory blocks the first. Thank you all for the help.