Hi all I'm new here looking for help or clarity... I have been wondering if it would be possible/viable to upgrade my pc components instead of buying a new one.  I purchased an ASUS computer from Best Buy my last go round but it seems simple enough inside that it would be upgradeable.  Wondering if 1)anyone has had experience doing this and 2)what parts should I get.

Currently has:
OS: Windows 10  64
CPU: Intel Core i7-4790S
Ram: 12 GB
GPU: NVIDIA GeForce GTX750 1GB
HDD Storage: 2TB
PSU: I forgot to look at the wattage but would probably upgrade that regardless they don't usually install decent psu on pc's like this

I'm thinking of upgrading the cpu, gpu, psu, and probably getting a ssd, is my motherboard going to be an issue? :/ thanks in advance for any help.
Budget is relatively open just not looking to put 5k into this...Knowing which motherboard MAKE/model you have will help know what your main board maxes out at.

Surprised the i7 isnt enough that you have... if your thinking of upgrading that.... its a pretty decent CPU. Maybe you have something else going on that is causing a slow down like an infection of malware ETC if you think your system is too slow.

The Video Card and adding a SSD is only upgrades I can SEE needed for it if your doing HEAVY gaming. SSD woudl make games that are large in size launch faster than a hard drive.

The RAM should be fine at 12GB Your probably using only about 8GB of it when heavy gaming anyways.