The reason I asked the questions:
1. If you are going to upgrade a graphics card, I now know it had be better than a GTX1050ti. Something in the GTX1660 class.
2. A GTX1050ti will run on even a junky 300w psu.
If you are going to upgrade your graphics card, say for instance to a GTX1660 or better, you need something at least 450w, probably 550w.
Here is a handy chart to size the psu you need:
http://www.realhardtechx.com/index_archivos/Page362.htm
The make/model tells me if you have a quality unit.
The name of the psu and it's power will be on a required data plate on the psu itself.
Do NOT ever buy a cheap quality psu.
A cheap PSU will be made of substandard components. It will not have safety and overload protections.
The danger is if it fails under load, it can destroy anything it is connected to.
It will deliver advertised power only at room temperatures, not at higher temperatures found when installed in a case.
The wattage will be delivered on the 3 and 5v rails, not on the 12v rails where modern parts
like the CPU and Graphics cards need it. What power is delivered may fluctuate and cause instability
issues that are hard to diagnose.
The fan will need to spin up higher to cool it, making it noisy.
A cheap PSU can become very expensive.
Do not buy one.
Here is one list of psu quality:
Credit to @Starelementpokeand @Energycore for helping out with this long-awaited refresh of the old PSU tier list by Aniallation (who previously went several months without logging in), leaving the old list in need of help. This is simply an update of the list that was flawed in creation by the P...
linustechtips.com
It is not wrong to buy an extra strong psu, it will only use the power demanded of it, regardless of the max capability.
3. Your motherboard tells me that with a H81 chipset, you can not overclock your 4790K for added capability.
You now have the strongest processor available for your motherboard.
Your budget should allow you to buy a card as good as a GTX1660ti.
4. Some cases are extra small and will not allow a full sized graphics card or power supply.
Some cases do not have sufficient air intake capability to cool higher end parts adequately.
Your cpu cooler needs an adequate source of fresh air to do it's job.
If your case has at least two front 120mm intake fans you are ok.
If the dimensions of your power supply at the rear are 86mm x 150mm, you have a standard ATX psu.
5. A ssd for your C drive is wonderful, but 120gb is too small.
When the drive starts to fill up past 90% it will slow down and wear out faster. If your games are on the HDD, they will not run as well as if on a ssd.
That is probably not all that important for fps performance.
But some tasks such as level loads or texture loading will take longer.
To get an idea if a faster graphics card would help, try this test:
Run YOUR games, but lower your resolution and eye candy.
If your FPS increases, it indicates that your cpu is strong enough to drive a better graphics configuration.
If your FPS stays the same, you are likely more cpu limited.