CPU is bottlenecking after upgrading graphics card

YarinLowe

Commendable
Jan 28, 2017
3
0
1,510
Hi!
Yesterday I upgraded my AMD Radeon HD 7790 to a brand new GTX 1050 Ti,
and also upgraded my slow 4GB RAM, to a much faster (1866Mhz) 8GB RAM.

With my old hardware, in MS FSX, in heavy scenery airports, I used to get around 18 FPS.
Now, after the upgrade, I get no more than 11 FPS.
After monitoring my resources, I noticed that all of the 4 cores of the CPU are on 100%.
I understand it, the graphics card and the RAM are better, so now the bottleneck is the CPU, that's fine - but how is it possible that the FPS is now lower?
I mean, if the graphics card or the RAM were the bottleneck, that means that the CPU succeeded to run in a way that allows 18 FPS, and now, after the upgrade, it won't work in such a way - that's pretty wierd, I think.

Does anyone have any ideas that can explain this situation, or even improve my CPU's performances? (I thought about overclocking, but with my CPU it won't help much, I think...)

Thanks in advance for the helpers!

My hardware:
- CPU: Intel Core i5-2400 3.1Ghz
- GPU: MSI GTX 1050 Ti 4GT OC
- RAM: HyperX FURY 8GB 1866MHz
 

YarinLowe

Commendable
Jan 28, 2017
3
0
1,510

I removed AMD's driver using DDU which is recommended across the web.
Then, I rebooted my computer, and installed the new driver, which I manually chose and downloaded on nvidia's website.
 
Still sounds strange. Given the specs of the new graphics card against the old one would expect there to be a slight performance boost, though as I understand it FSX is CPU heavy and still hammers hardware.

In which case have you checked the standard things like temperature?
 

YarinLowe

Commendable
Jan 28, 2017
3
0
1,510


The RAM is detected.
I didn't understand, if IT IS detected, why to reinstall Windows?