At the moment i have an AMD fx 8350, and i'm thinking of upgrading this summer, since it can't run some badly optimised single-core-heavy games. Lets say i'd switch to an intel i7 7700k or an AMD Ryzen R7 1700. Would the difference be noticeable? (the games already runs fairly well, i just want to know if the games has no upper bound of tick speed, and i got a GTX 1070 for a video card so i got no problems there).
You haven't said which Paradox game you are talking about. Let's consider Stellaris...
- I run on an i7-3770K (not even overclocked) from a few years. Yes, the CPU is a big factor, I can tell from when I play on an even older notebook, where the ticks are much slower. The size of the map is a big factor too.
- The Intel CPU you suggest is quadcore, not octacore, but IMHO it wouldn't make the slightest difference.
- In my experience monitoring Stellaris it seems to use one core more than others. Games might spread tasks over multiple threads, spread on multiple cores, but not all tasks are the same. IMO the processing power of the single core is more important, but then again... (next point)
- if you switch playing Stellaris from your... stellar desktop PC to your notebook, maybe even older than the PC, then yeah you can bet you will notice differences, otherwise meh... who knows. Maybe yes, maybe not, we're going in the subjective area here, we humans don't all have the same perceptions. I mean a full month of Stellaris might pass in a fraction of second faster with the changes you have in mind... is it a noticable difference for you, is it noticable to John Doe? But I would say it's a big gamble, and I wouldn't even bet a cent on the fact you will solve your issues with other games by simply upgrading to another CPU. Maybe changing manufacturer from AMD to Intel might do the trick, but not just for the mere performances of the CPU. A computer is a mix of components that must work together, you shouldn't consider them singularly when making these considerations.
In summary: you asked 2 questions but they might have different answers. You asked if the tick speed is capped (I assume) by the program, I don't have any qualification to answer but I highly doubt it, so as the first answer says, (in theory) upgrading the processing power will make your game run faster, but you also asked if you'll be able to notice this difference and this question needs a much more elaborate answer, which I tried to give above although we should have talked of several other components of the computer to go more into details and it's probably a waste of time
