What should be the requirements (if any) for CPUs? Is i5 series good enough, or do we need i7 series?
Now that we're talking about Notebook processors, the answer cannot just be one or the other, it depends.
Notebook CPUs have many specs to take into account for the one thing that counts for IL-2:
Single Thread Performance.
This is all that counts, nothing else.
You can see a chart showing how different CPUs perform on single thread operation here:
https://www.cpubenchmark.net/singleThread.htmlYou will soon notice that it's not that easy to spot the Notebook CPUs.
The fastest one is the Intel Core i7-4940MX @ 3.10GHz with 2193 Passmark points.
2nd place is Intel Core i7-4930MX @ 3.00GHz with 2160 points.
3rd place is Intel Core i7-4910MQ @ 2.90GHz with 2160 points (yep, surprise surprise, 100MHz less but same points on single thread operation).
4th place is an i5 then, the Intel Core i5-4340M @ 2.90GHz with 2104 points.
There's another 6 or so i7 mobile CPUs on the following places before the next i5 comes up (Intel Core i5-4330M @ 2.80GHz, 1925 points).
Aynthing below 1800 points won't make you happy with IL-2 on large missions, so you should really take a look what CPU precisely is working in that laptop of your choice and check it's single thread performance from the above given list first.
My old 2700+ and 970 can run IL-2 balls out. The issue is your graphic tweaking.
You're comparing apples and oranges.
You talk about desktop CPU/GPU, the TS was asking for mobile ones.
What about working Intel graphics HD 6200 (GT3 class) with OpenGL 4.3 API? Will it work with third Nvidia shaders (perfect mode)?
No.
Intel HD is a no-go for IL-2.
The reason is that Intel focused on DirectX support, their OpenGL drivers can be considered "alpha" ones at best and none of them works (correctly) with IL-2.
Best regards - Mike