Yeah, I'm aware of the connectors, adapters and all that rot. Tried it couple years ago. I couldn't get it to work. My computer tech that does housecalls failed, and the local computer shop could barely make it work (with my LCD monitor looking like a CRT playing a videocassette). Ended up costing me a couple hundred dollars, and kept me offline near six months. Not a can of worms I'll be opening again. Those gimmicks, along with wireless/wifi/bluetooth are banned here. If/when my monitor ever dies, and I absolutely can't find one with VGA, that is when I'll switch to DVI...until then, it's VGA across the board.
I watch movies on my current XP Pro rig (used OptiPlex 960). I have managed to get Linux Mint in LiveCD mode to do Youtube videos, but it's pretty much useless on the freesites like putlockers, 123movies, etc., which have a plethora of popups, redirects, and subterfuges to install adware/malware. Only my XP (and the right browser addons) can handle that. Never tried with TAILS or Kodachi Linux....I just use them to safari into Darknet land. A hobby of mine.
I had a Geforce GT 710 installed into my OptiPlex 960 with zero improvement. Even 'Darkness Prevails' on Youtube buffers at least a couple times in a half hour, and that show is just talking with little or no video. With the freesites, it's regular buffering, pixelation, sometimes freezeups. I have a used Dell Optiplex 7010 Mini-Tower, Quad Core i7 3770 (3.4GHz), 16GB DDR3 SDRAM, 1TB Hard Drive: Windows 7 Pro 64-bit rig...waiting to replace it. I've been told on other forums it has enough power to solve the video problems, but then I was told the same about the Geforce GT 710. With this custom build I'm aiming for overkill, so far as legacy parts allow.
My OptiPlex 960 could only be upgraded to a intel core 2 quad q9550, and 8GB RAM, so definitely no match for your i5-9600k. It does what it can with what it has to work with. After 3+ years of surfing the net (over 5000 hours), with zero malware, using an EOL/EOS operating system and outdated browsers...ain't nothing to complain about. I'm hoping I can make Win 7 as bulletproof!
My parts-list as it stands today is:
Case: CM Storm trooper
CPU: i7-4790k
Cooler: Noctua NH-D14
Motherboard:
MSI Z97 Gaming 5
MSI Z87-GD65 Gaming
MSI Z97-GD65 Gaming
MSI Z97-G45
MSI Z97A Gaming 6
RAM: G.Skill Ripjaws X-series 32GB (4x8GB) DDR3-1600 CL9
Video card: GeForce GTX 750 Ti 2GB or GeForce GTX 560 Ti
DVD burner: (Two) Asus DRW-24B1ST/BLK/AS
Storage:
WD Caviar Black 1TB 3.5 7200rpm HDD
Crucial MX500 500GB SSD
Mobile rack: Syba SY-MRA55006
Power Supply: Seasonic Focus 650 W80+ Gold
The motherboards and graphic cards look to be pretty much equal, so I'll likely buy the first one I find. This is not a done deal, and the above is subject to revision until I commit, by buying a component that locks me into this build. This is only to answer any question as to how 'legacy' this build is. According to the 'latest&greatest' crowd, it's prehistoric. I have other ideas. It appears Photoshop CS3 can no longer be activated, and every other rendition looks to be like $300+ used (way more than I would ever pay for any software), so it seems like I will settle for GIMP.
Here is a link to the Wikipedia page about the VGA connector - https://en.wikipedia.org/wiki/VGA_connector
The VGA connector is a D-sub type DE-15, I haven't seen a graphics card or monitor with a different VGA connector, they have all had 3 rows of 5 pins for 15 pins in total.
Are you watching the movies using the LiveCD, or in windows? I don't think using the tor network for streaming would be very stable.
Even the cheapest graphics card, the GeForce GT 710 will handle full HD movie playback if that is causing the problem.
One of the reasons I want a decent graphics card (after building the PC there were none available, I am using the i5-9600K graphics) is for
video converting. The Geforce cards have CUDA cores in them, which can be used to vastly speed up the conversion process in the software that supports it, although the i5 does a pretty good job on its own and can convert a 140 min 1080p film in about 40 mins.
Have a look at this page, it lists nearly every graphics card made going back to the 90's - I had a Radeon 9600 SE way back in 1995 (not listed, but the LE is) - have fun Googling them... https://www.tomshardware.com/uk/reviews/gpu-hierarchy,4388.html
This page is for checking if a card can run certain games, BUT, if you click on the GPU dropdown selection, it goes back to some quite old cards, you can then click on the picture that comes up and it will try a search on Amazon - https://www.pcgamebenchmark.com/compare-graphics-cards
You will have to be cautious here and make sure you are looking for the right interface, I presumed before that you had PCI-e in your PC, but as you are talking about a legacy build is it AGP?
I have dabbled with photoshop, but because I scraped by for years on an old slow computer didn't use it a lot, because my PC would make it annoying to use. I got into photo editing on Paint Shop Pro, and the program got quite good over the years, and in some cases I think its better than photoshop because it has more automation and user friendliness built in. However now I have a half decent PC I will go back to relearning Photoshop again. I used GIMP in its early days, looks like its improved a lot, just downloaded it to check it out.
I recently bought a second hand Panasonic FZ330 camera (FZ300 in USA), so I can't wait for summer so I can go out and get some photos to edit.
Hope this helps some more.