Just an FYI - I got my hands on a old GTX1070 GPU (the card was about 6 years old) and plugged it into my pixinsight computer. Despite the age of the card, the speed boost is astonishing! A blurX on a mono image from my 2600 finished in less than 30 sec!
I installed using instructions from the RC-astro sight:
https://www.rc-astro.com/gpu-acceler...powered-tools/
Goes to show you don't need to have the latest GPU card to get a lot of benefit! I highly recommend getting any nVidia CUDA card -they are a great value for money add on!