Will Crysis 18 require a small nuclear reactor and 10 intel i9-9770k chips to power your game? NO ONE KNOWS
have read this like 5 times already and I just can't stop laughing...small nuclear reactor!!!
anyway ankk, games coming within the next 5 years will not demand 5 GHz clock. That is because, right now we are all seeing a convergence between PC and console gaming. Console gaming always takes more time in upgrading hardware compared to the PC industry.
The production industry which actually dictates cpu power is helped more by better IPC/architecture rather than sheer GHz. And we see that difference manifest itself in Intel's budget chips performing better than AMD upper range chips.
If you've seen the latest PS-4 specs you will see an 8 jaguar core amd package sitting inside with shared ddr5 ram for the cpu-gpu.
all those cores are 1.6 GHz and really all the cpu's we have, will do reasonably well with games coming in next 4-5 years. And we are all seeing bigger l3 caches but no l4's
DDR5 ram will not provide a massive leap over ddr4/3 but only an incremental one.
So you are secure in terms of cpu and ram for this period. a game engine's thread management player controls, actions etc are handled by the cpu but it is the GPU which renders each pixel in each frame and computes object physics and this is the reason why most games are held back or accelerated by gpu(which all have their individual vrams at ddr5 anyway) and that is the component you will have to upgrade for a performance boost. which marshal and tiger have both already pointed out.
read these two threads and you'll know the importance of the gpu better.
http://gaming.stackexchange.com/questions/25465/why-do-video-game-framerates-need-to-be-so-much-higher-than-tv-and-cinema-framer
http://boallen.com/fps-compare.html
good luck and happy reading
-satyam