[SOLVED] System Upgrade Recommendations

Apr 2, 2019

My PC currently runs 'fine' for 90% of everything I need it for, however as the world adapts to 4k video and 1080HD 60FPS streaming services such as Twitch/Mixer/YouTube I'm running into stuttering/tearing? I'm not sure exactly what's happening, but regardless the video will not smoothly play at higher qualities. The is a home PC, I only play 1 game, Final Fantasy XI, which is about 15 years old and not really worth mentioning other than the fact that it's so old it's notorious for being hard on CPU's whereas everything in today's world now relies on GFX Cards for their power. I use Google Chrome and regularly have 10-20 tabs open depending on what I'm doing, and one or multiple of these tabs will be the afore mentioned streaming services, as well as FFXI running in the background. I'm not looking for anything over the top, but am not afraid to future proof if it's within reason, my main concern is simply being able to multi task and stream 4k content with zero issues. Just to be clear, I am in a large city, hardwired ethernet, with internet speeds of 300 down, although only 12 up, with 8ms ping, so I don't assume this to be an internet issue.

Approximate Purchase Date: This month

Budget Range: I was planning on $400-600, but I'm comfortably flexible if there's legitimate justification to go beyond this.

System Usage from Most to Least Important: Video Streaming, Multi-Tasking, Web Browsing, Gaming.

Are you buying a monitor: No, and if it's worth mentioning I use a 55" Sony 900E HDTV as my monitor.

Parts to Upgrade: I don't know, this is my main question I suppose.

Do you need to buy OS: No

Preferred Website(s) for Parts: Doesn't matter to me, as long as it's a trusted reliable site.

Location: Sacramento CA

Parts Preferences: Indifferent

Overclocking: No

SLI or Crossfire: I don't know what this means.

Your Monitor Resolution: 4k TV (Sony 900E)

Additional Comments: Current PC Build is as follows:
Tower: Raidmax Smiloden

MoBo: ASRock Z97 Anniversary
https://www.newegg.com/Product/Product.aspx?Item=9SIAFVV8JW3279&Description=asrock z97 anniversary&cm_re=asrock_z97_anniversary-_-9SIAFVV8JW3279-_-Product

CPU: Intel i5 4590 3.3ghz

GFX: Radeon HD 6870

Unknown single stick 8GB DDR3
Unknown Model of a Samsung 1TB SSD
Unknown Model of a 600W Power Supply
I think that's all the parts?

Thanks in advance, appreciate any help.
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