S3220DGF, two, trouble with extended support

@shoeprano27  Just for additional background about the products you bought:

• The StarTech MST14DP123DP is an MST hub.  That will allow you to run multiple independent (Extend mode) displays from a single output.  However, that's primarily used when your system only has a single DisplayPort output to work with.  Your 2070 Super should have at least three, so it doesn't really make sense to buy a relatively expensive MST hub if your GPU has enough ports to allow you to connect each display directly.  Additionally, an MST hub requires that the total bandwidth requirements of all attached displays fall within the bandwidth available from the single GPU output that it's using, and I'm not sure dual 2560x1440 at 165 Hz will work from a single output.
• The StarTech USB32HD2 is a dual HDMI to USB-A "regular USB" adapter.  That is a horrible choice in your case.  USB-A never supported native GPU output the way USB-C optionally can, so any video adapters that plug into USB-A ports rely on "indirect display" technology such as DisplayLink -- not to be confused with DisplayPort.  That type of technology comes with a ton of drawbacks that can be significant in certain use cases, especially gaming.  I wrote about them in the post marked as the answer in this thread if you're curious.
• As for the HDMI splitter, those are designed to take a single HDMI signal and mirror it out multiple outputs.  You cannot achieve extend mode that way because HDMI has never supported running multiple independent displays from a single output.  DisplayPort can do that, which is why the MST hub I described above would work, but not HDMI.

But yeah, you don't need any of that equipment for your setup.  You just need a pair of regular DisplayPort cables.

@shoeprano27  What did you buy all of that stuff for?  Your 2070 Super should have multiple DisplayPort outputs.  Those displays have DisplayPort inputs.  Get a pair of regular DisplayPort cables and you're done.

ah thank you, kind sir. do you have a paypal address so i can send you a cup of coffee or something. 

i purchased all that stuff because i thought thats what ill need to connect  multiople monitors, to get the 175hz and all those fancy features of the monitor. 

the 2070 have 3 dp ports DisplayPort 1.4, if that even matters.

thank goodness im still able to return those adaptors amongst a bunch of different cables. 

thank you again. even for the breakdown of each adaptors. im going to try and plug in those cables. hopefully its as easy as how you made it sound. 

@shoeprano27  Happy to help. :). I appreciate the offer, but no need for coffee money through PayPal.  I’m an IT professional and view my time here as my “pro bono” work to help do some good in the world. Anyhow, generally speaking adapters can’t add any capabilities that aren’t already available from the original source, so for example if your GPU wasn’t capable of 2560x1440 at 165 Hz, then adding an adapter isn’t going to make that possible all of a sudden — though adapters can certainly add limitations that might not exist from the source, because sometimes the adapter itself doesn’t support something that the source does.

Anyway, I’m pretty sure 2560x1440 165 Hz is possible even over DisplayPort 1.2 just from doing the math on bandwidth requirements, plus I just noticed that the display product page indicates that it comes with a DP 1.2 cable. But considering that your GPU supports DP 1.4, which offers even more bandwidth, you’re definitely covered. The only fancy feature I’m not sure about here is the fact that the display supports AMD FreeSync Premium Pro, but you’ll be connecting it to an NVIDIA card. NVIDIA’s equivalent technology is called G-Sync, so typically if you use an NVIDIA GPU, you get a G-Sync display, and if you use an AMD GPU, you get a FreeSync display. I know NVIDIA has recently added at least some support for FreeSync via driver updates, but I don’t know how comprehensive it is in terms of supported displays or feature set. But if you can’t use the full set of FreeSync Premium Pro features from your NVIDIA GPU, then no adapters or cables will help you there. The only requirement is that you need to be using DisplayPort, but you’ll be doing that anyway. If that bugs you, then you’d either need to switch to an AMD GPU or else switch to G-Sync displays rather than FreeSync displays.