I had both a Vega 64 and now a Radeon VII GPU on Bykski waterblocks. Both ran fantastic temperatures IF you use a quality thermal paste on the GPU. I just ran through all the GPU benchmarks on the Radeon VII I could throw at it and the hot spot only maxed at 68 C. GPU Temp maxed at 41 C.
They were significantly cheaper that EKWB blocks (which were too LONG for my build) and the rest of the manufacturers were super expensive. I would buy Bykski GPU blocks again in the future.
BTW - Their directions are basically useless unless you can read Chinese. The pictures do help.
Build: msi C8r (Carbon8r)
Core i7-9700K, MSI Z390 GAMING PRO CARBON Mobo, MSI Radeon RX VEGA 64 Air Boost OC GPU, Corsair Vengeance RGB 32GB DDR4-3200 RAM, Phanteks Enthoo Pro M SE ATX Case.
XSPC RayStorm Pro CPU w/b, Bykski Vega GPU w/b, EKWB 140 Revo D5 RGB Pump & Rez.
Aquacomputer Aquaero 6 LT USB Fan-Controller, Vision Touch and 'High Flow' Sensor.
(2x) Hardware Labs Black Ice 280GTS XFLOW radiators in full push/pull with 6x Deepcool RF 140mm & 2x Prolimatech 140mm Slim Fans.