Is a GTX 750 oc edition good?

I have my old pc (Dell Optiplex 780 (Btx)) and I want to set up a graphics card. The processor is an Intel core 2 duo.

Would the Gtx 750 oc edition be compatible and good for Minecraft, Rocket League and League of Legends?

I (unfortunately) still have a 750 myself, for less demanding things it is very good. Minecraft with shader works, talk too. It is sufficient for my circumstances. LOL should actually work with it (I played it a long time ago). But it always depends on the settings.

What is this shader actually

Minecraft looks "more realistic", so the leaves are moving, for example.

And how much fps can you make it on high graphics

Of course it depends on what I'm still running in the background, but mostly 200-300 FPS, on a completely empty Windows account I sometimes had 1000-1500 FPS. I have now limited it to 60 because my current main monitor only has a 60 Hz monitor anyway

And what kind of processor and what ram do you have

Intel Core i5 5500k & 24 GB RAM with Minecraft allocated 8 GB.

Ah ok then I'd rather get a new processor ram I'll have enough thank you!

Well, it's more than enough for your CPU.

Could also use a new cpu. But is the cpu sufficient for the games?

The games will start and run, YES