I wish that I had read this thread before purchasing the just lowered price of $ 139.99 and $ 20.00 rebate on an AMD RX 570 video card. I hate spending good money on a poor product.
I wanted to upgrade my perfectly good Nvidia 470 graphic card to utilize my new LG UHD 32" 4K monitor. I was excited for two minutes until I discovered the horrible drop in frame rate of every room I was in SL and the awful stuttering effect of movement. Google search shows many unhappy people with this problem , even after many upgrades to latest drivers and configuration changes. So, it was back to my Nvidia card that will be replaced by another more powerful card as prices come down. I hope future buyers comparing video cards for SL usage read this thread and realize that SL and AMD have some problems in a smooth experience online.