Replacing the video card, is it worth it?

Question

Video cards

At the moment, there is a AMD Radeon HD 7700 Series с 1 Гб памяти completely working video card and enough to play, but it became possible to change it to Sapphire AMD Radeon RX 550 PULSE with 2 GB of memory. There are various reviews about it on the Internet, some say that compared to 7700 fps in games has increased, and someone says that nothing has changed significantly.
In general, is it worth changing? The machine is used for both work and play games such asThe Elder Scrolls V Skyrim