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#11
I forgot sounds cards are mainly x1 for a while now so if that is the case and the motherboard has the slots for it then choose those instead. Overall it won't matter to much where you put it. Aesthetically pleasing would suffice so which ever slot it looks good to you.
if there is no x1 slots it would actually be better come to think of it to put it in the x4 slot because it wont change your GPU pcie slot to x8.