Mining GPUs

I curently have a fouple of RX 580 mining RVN at hasrates of 10 MH/s (It’s Elpida memory, Samsungs memory gets 15MH/s) but I heard some talk about Sapphire R9 Fury that it gets 17MH/s, and I can sell my RX 580, make a profit, swal them for R9 Fury and increase my Hashrate. I just need someone to confirm that it’s legit and is it worth it? R9 Fury are 50€ cheaper than RX 580.