OpenBSD Desktop GPU recommendation
       ========================================================================
       
       OpenBSD has decent intel GPU support. So finding a laptop that works
       great is not really difficult. The story is different when you look at
       desktops. I've tested several graphic cards and there are winners.
       
       +----------------------------------------------------------------------+
       |                                                                      |
       |   Radeon R9 390X (radeon)                                            |
       |                                                                      |
       +----------------------------------------------------------------------+
       
       This card is driven by the HAWAII XT chipset, which is covered by the
       radeon drivers HAWAII support. It's the latest and fastest device
       supported by this driver.
       
       +----------------------------------------------------------------------+
       |                                                                      |
       |   Radeon HD 7790 (radeon)                                            |
       |                                                                      |
       +----------------------------------------------------------------------+
       
       This card is driven by the BONAIRE chipset, which is the predecessor to
       HAWAII. This card is still listed as high end card, but draws a lot less
       power than the R9. Both are fine for gaming.
       
       Both cards support resolutions up to 4K. However only via display port.
       The R9 delivers 4K@30Hz via HDMI.
       
       Newer AMD GPUs are supported by the amdgpu driver, which is not as
       stable as the old radeon driver.
       
       +----------------------------------------------------------------------+
       |                                                                      |
       |   UPDATE: Radeon RX 450 (amdgpu)                                     |
       |                                                                      |
       +----------------------------------------------------------------------+
       
       My setup is HDMI based, and I had to use an active adapter from DP to 
       HDMI to get to a 60Hz 4k signal. This HDMI signal is then going into
       my KVM switch and  from there to the screen. With this many  hops,
       I experienced some sort of jitter every once in a while. 
       
       There was significant progress in the amdgpu development in the last
       months, so I gave it a shot again. I'm now using an RX 450 card with
       tthe Polaris 12 chipset. It runs stable for me. So maybe amdgpu is
       ready for prime time? At least with this chipset I'm very pleased with
       its performance. The HDMI 4k signal is stable.
       
       # Changelog:
       # * 2020-07-12: Created
       # * 2020-12-09: Add RX 450 amdgpu