Asia region based BYKSKI released the A-SP58PLAT-X water block for Sapphire RX580 NITRO+ edition. The A-SP58PLAT-X full cover water block is based on pure copper of the metal part.... BYKSKI Offers Waterblock for Sapphire RX580 NITRO+
EKWB waterblocks are manufactured in Slovenia. I really doubt that EKWB has an association with BYKSKI