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: Z390 ACE
Core i9-9900K OC 5 GHz, MSI Z390 ACE Mobo, AMD Radeon VII GPU OC 2K MHz
Corsair Vengeance RGB 32GB 3200 RAM, Phanteks Enthoo Pro M SE.
EKWB Z390 ACE Monoblock, Bykski Radeon VII GPU w/b, 2x EKWB 140 Revo D5 Pump & Res.
Aquacomputer Aquaero 6 LT USB Fan-Controller, Quadro, Vision Touch and 'High Flow' Sensor.
(2x) HWL Black Ice Nemesis 280 GTS XFLOW and (1x) Alphacool XT45 X-Flow 280 radiators.