Best way to add DisplayPort to PC for 4k dual monitor?

[akshelton]

I'm not necessarily worried about price, but I don't plan to game, so I don't need anything too crazy. 

I have 2 27" 4k LG monitors that only have HDMI and Displayports. My computer only has 1 VGA and 1 Displayport. 
I didn't necessarily want to use a VGA to Displayport cord or adapter, but I could be persuaded if that's not a bad option. 

This is a link to the computer that I own: 
https://www.newegg.com/Product/Product.aspx?Item=N82E16883285740 

HP 6300 PRO SFF 
Intel Core i5 3470 3.2G 
16G DDR3 
Windows 10 Professional 64 Bit 
I don't see any info about the power supply in that link, so I'll have to open up the PC and see what I have after posting this. 

I looked into an MST hub, but the reviews were all over the place: 
https://www.amazon.com/StarTech-com-DisplayPort-Multi-Monitor-Splitter/dp/B00XXPYGPO/ref=sr_1_3?ie=UTF8&qid=1523711058&sr=8-3&keywords=displayport+splitter 

What about adding a graphics card? What card would be recommended? 

I'm honestly not doing anything fancy, but would like to at least be able to run 2 4k monitors at full resolution. I mainly got dual monitor for playing japanese games on my playstation with english guides on the other screen, but I also like the idea of having 2 full screen windows for watching a how-to video on one - and following the steps on another. (I know its not necessary to have 4k for that, but why not?)

[djboy6480]

A cheap GPU would be the best (when you are not in to gaming) something like a 1050ti

[Minotaur10]

A realtively cheap GPU would be your best option. If you're not looking to game or anything you should be OK running 4K 60Hz on a GT1030 or GTX1050

[djboy6480]

2 minutes ago, Minotaur10 said:

should be OK running 4K 60Hz on a GT1030 or GTX1050

A GT1030 will be too weak to run 2 x 4k@60Hz
and a GTX1050 will be on the edge but should do it but for 40$ more you get a much more powerful card and can be on the save on the performance side

[G27Racer_188]

While the 1050 ti would work, you need to get one that is low profile, as your case only accepts low profile (half height) cards.

 

I don't know which model your monitors are and if they will run at 60hz over HDMI, so I took a bit of different approach to choosing the graphics car

https://www.newegg.com/Product/Product.aspx?Item=9SIA2F85EC0448&cm_re=quadro_p400-_-14-133-647-_-Product for about $130 dollars. It has 3 DP, so even if you get a third 4k monitor, it has you covered.