performance if upgrade i5 to i7 for my x230

not notice improvement yea

agree

I read it somewhere if not mistaken it's just about 7% difference

Totally agreed.

He is right. The progress is a few percent :c

absolutely

X series has CPU soldered, those CPUs are not applicable to X230

same speed yea

If you mean web browsing with bad connection then yeah, but because most of the time you're waiting for IO. Otherwise, 4 core CPUs outclass any 2 core anytime since load is distributed among them. That's why even single-process applications benefit from more CPU cores.

How do multiple cores speed up single-process sw?

Basically what he's getting at is having more workers share the same workload accordingly being more efficient or less taxing overall than if you were to have the same workload across less workers

You can think of it as having 4 librarians stacking shelves from a single box of unorganized books, compared to having 2 librarians stacking shelves from the same box

It's called parallel processing, and it can only be used for a few types of applications, and only for code that's written to take advantage of the technique.

maybe I should rephrase it, by load I mean everything that is going on on your desktop all at once, having more cores would lessen the load of running your OS and the apps on it overall

Sorry about delay. Yes, you can't run single process application on multiple cores. Such process will always occupy single CPU thread.
But hell of a lot of processes are running concurrently at any given time. Just look at windows task managers. THOSE are distributed among other CPU threads so main thread has more free time to do whatever needs to be done

ok sir

If want upgrade from x230, what model thinkpad can i select? Affordable price

Write down use cases. Portability and getting things done? T480s. 4 core 8 threads CPU, decent performance, though you will hit crippling thermal throttling (from 4GHz turbo boost to 1.8GHz base clock) the moment you try to run any demanding task(e.g. compile C++ project).
Extreme portability? Anything from X series. Though X280 might be more pricey with same CPU as T480s. Office use vs. travelling manager use cases.
If you need cheap but solid workhorse, you might try T460p, T470p or even P5x series. Be warned though-while my company issued P53 packs quite a punch-6 core 12 threads 9th gen high performance i7-i don't want to carry it all day in backpack.

ok thanks info ..

there are suppliers that mod a x230 motherboard that has a quad core cpu