Yes.   It's possible.    
 
You will need to perform all this on a working computer.  In my case NVME slot one was my primary windows 10 install.  I designate the second NVME slot for a windows 7 install.  If you use slot 2 for the NVME, the small PCIe slot will be disabled, so use PCIe slot 4 for any USB expansion card.  
 
You will need a few things.
1.  Perhaps a PCIe USB controller.    Windows 7 currently does not have and will not support the EVGA dark USB device (intel spec.  ASMEDIA seems to work).     The USB plug next to the audio ports supported my USB dongle for mouse and keyboard and may be ASMEDIA.   Try that before buying a card.   If you need a PCIe card then this one works.  I happened to have one I used out of another older build.     https://www.amazon.com/gp/product/B01MQ5R7I1/ref=oh_aui_search_asin_title?ie=UTF8&psc=1  Initially, I used this card but after removing it and trying various USB ports, the red one next to the audio ports worked. 
 
2. windows 7 burned to dvd for install.   The procedure for this is to download a program that will involve installing NVME drivers into the windows 7 installation ISO.   Go here and make an account to get the program to do this.   https://forums.mydigitallife.net/threads/windows-7-image-updater-skylake-kabylake-coffelake-ryzen-threadripper.76335/     I tried ASUS, GIgabyte and Rufus injector programs.  These did not work to recognize the NVME drive.  
 
It is called windows 7 image updater.
Download a windows 7 ISO installation File off of the internet    you can find links here https://www.howtogeek.com/186775/how-to-download-windows-7-8-and-8.1-installation-media-legally/  and go to the microsoft website and use your product key to download a copy.   
Run the windows 7 image updater and select the windows 7 ISO you downloaded from microsoft.   Toggle the options you wish to install and hit start.  This could take a few hours (my ISO had all 4 copies of windows 7)  and it will show your progress through the process.  This will inject the NVME, USB (although onboard USB will not be supported) and current windows updates though 2018 into the final windows 7 installer ISO.  This saves so much time as most of the windows updates will already be there. 
 
Once it has finished, burn the windows7.iso to a blank DVD (might use a  DL DVDr if you exceed the size of a single layer)    Once the windows 7 iso is burned to dvd, shut down, return to bios and put your CD rom as primary boot device.   Also toggle windows installation in the bios.  This gave me USB wireless keyboard support during the windows 7 installation and booting into the OS (I guess the bios gives you a driver).  I did not have mouse support.   You can also plug your USB wireless dongle into the PCIe card you bought and installed.  It worked for me and I had full mouse and keyboard support.  Evidently  no driver was needed for my install.
 
Install the OS.   Perform all most current windows updates.   You can install the EVGA dark chipset and sound drivers while in windows 7 off of the USB card that came with your motherboard.    just allow or force the drivers when it asks.  All other drivers except sound and chipset seem to have only windows 10 support but you can try each manual install on the USB card that came with your MB.     When you are into your OS, look at the device manager.  onboard USB will not be unavailable and one of the network capabilities also will not.  I did have ethernet  and internet support after boot up into the fresh install.   I believe the I219-V was unavailable. 
 
I have full functionality with USB with the PCIe adapter.   I wanted  a second NVME drive on the board with windows 7 in order to run some programs that are not compatible with windows 10.   I can see that some will want to benchmark with windows 7.  I'm not opening a debate on why run windows 7 and an EVGA dark.  Its your own business why you choose to do so.   
 
This is the easiest way to get windows 7 to work with the Z390 chipset.   
 
If you want to boot into windows 7 NVME from time to time, you can assign your boot drive in the bios to do so.   I plan on using the onboard PCIe toggle switch to disable PCIe slot 4 when not in windows 7 to free up resources.  
Have fun. 
 
 I have the windows 7 ISO with all versions of windows 7 with all the injected NVME drivers and windows 7 updates available.  If someone wants to host it and provide a link, send me a PM.    It's 4.7 gb and I can upload it.  Saves people time.  I just don't have hosting for something that large.  there's a blue ribbon in it for you. 
 
one caveot.  If you go back into a windows 10 NVME, occupying PCI4 will kick you out of sli if you have video cards in slots one and two and the NVIDIA control panel dissappears.    Disabling the PCI4 via the onboard toggle switch didn't help.   I had to remove the external PCI USB card to get SLI back.   Evidently, even though you disable the PCI slot 4 (switch 3), the MB still see a card there and interupts SLI.   But hey, not perfect.  I'll only use the windows 7 NVME for a limited number of things. 

I just made another observation.   The RED usb port next to the audio connections appears to be asmedia USB. I tested all the USB ports and this one was the only one that would work.   I have full usb wireless keyboard and mouse on that port in windows 7.  Seems the other ports don't recognize the wireless dongle though. (The blue must be intel and surely don't).   I wonder if that's the only asmedia port that will work? 
 
I removed the PCIe usb card and booted up with a PS2 mouse in order to get into windows.   Once I got there, I verified the device manager had the asmedia active, and it was.  So originally, I did my install with the mouse and keyboard dongle in the blue usb port.  Seems the red one near the audio ports is asmedia and works in windows 7.  This is great news.  I don't need the PCIe card and can enable SLI again by freeing up the 4th PCIe slot. 
 
regarding the toggle in the bios to install windows.  Evidently this adds an XHCI driver to get windows installed and it recommends turning off once you get into windows 7 and get asmedia installed.   I turned it off and it didn't effect ability to use the mouse.  On initial install, I only had keyboard function though.  No mouse. 
 
I think it's great that the EVGA board with the z390 is not only capable of running windows 7, the asmedia driver makes it possible to have a port for the keyboard and mouse dongle.   Other owners of other MB have struggled to get any use  without a PS2 mouse or keyboard. 
 
First post was edited. 

Didn't know he posted a video.  I'll check it out. 
 

There is only one AsMedia USB port? Is it 3.1?
 
Would using a USB hub allow multiple devices, e.g. printer, UPS, mouse/keyboard, external SSD to function through that port?
 
Also, can two nvme SSD be used in RAID0 on this board?

Delirious

kelkel1
There is only one AsMedia USB port? Is it 3.1?
 
Would using a USB hub allow multiple devices, e.g. printer, UPS, mouse/keyboard, external SSD to function through that port?
 
Also, can two nvme SSD be used in RAID0 on this board?

I believe so.  you can use a USB hub.  Specs say the USB asmedia port is 3.1 gen 2.      two ssd can be used in raid.   consult the manual for other specs.
 
 

Thank you.


EDIT:
Another question, if I may.
 
I have made the DVD per your instructions, but...
 
Rather than doing a new install of W7; I have an existing install with the NVME drivers which I had added to a W7 install DVD on my current Z170 Classified K motherboard. If I were to add the CPU Fix to that installation and make a backup copy, would I be able to install that on the Dark motherboard? If that were possible, would I need to add anything else?
 
Of course, I would expect to have to re-enter the license key to re-activate Windows.
 
Looking at the manual, I see a Type C USB port below what I presume to be the AsMedia USB 3.1 port. Is that also on the AsMedia controller, or on the Intel USB controller?
 
Thanks again
 

Delirious
don't really know.  Haven't done that nor used the USBc.   But I think it is asmedia since it's right next to the other asmedia port.  

Thank you.
 
I ordered a Z390 Dark motherboard, and a RTX2080FTW3.
 
Hopefully, it will be as easy for me as it was for you.

well, if you tried these for windows 7,    https://downloadcenter.intel.com/product/55005/Intel-Rapid-Storage-Technology-Intel-RST-
 
and it didn't work, it is more than likely the CPU since coffee lake isn't "supposed"  to work with windows 7.
 
I mainly wanted to get a copy of windows 7 working for some programs that I use that don't work in windows 10 and I don't want to pay for upgrades.  Also wanted to putZ around the OS but after using windows 10 now, It's grown on me after I disabled the all the intel junk that wants to record what I do. 
 
really, people want to run windows 7 on the dark for better benchmark scores I guess.   But I think it's time to move on from windows 7, for me.  I still use windows 7 on a server and two office computers.  

I followed Carey Holzman's rather long, but thorough, guide for installing Windows 7 (Pro) on my Z370 Classified K with i7-8700 (non-K) using a 512GB 970 Pro M.2 NVMe.   Did not run into a single issue during the whole process as I already located and downloaded Windows 7 drivers for almost everything, and what I couldn't find drivers for, Microsoft actually had Win7 drivers for   and yet Microsoft says Win7 is not compatible with this new hardware......
 
Been using it daily since February, only downside, I still have an 'old' GTX970 card instead of something more modern, so I can only game in 2K on my 4K display

kelkel1
One thing I have noticed is the Creative audio will not play through the rear speakers on my Z-5500.
 
I have it connected through the optical port.
 
The rear speaker outputs come through the front speakers.

https://support.logi.com  Not supported under IE
http://www.logitech.com/repository/1411/pdf/13099.1.0.pdf
http://www.logitech.com/repository/1411/pdf/13098.1.0.pdf
The optical port is what you are supposed to use for this 5.1 Speaker System.

kelkel1

bcavnaugh

kelkel1
One thing I have noticed is the Creative audio will not play through the rear speakers on my Z-5500.
 
I have it connected through the optical port.
 
The rear speaker outputs come through the front speakers.

https://support.logi.com  Not supported under IE
http://www.logitech.com/repository/1411/pdf/13099.1.0.pdf
http://www.logitech.com/repository/1411/pdf/13098.1.0.pdf
The optical port is what you are supposed to use for this 5.1 Speaker System.

I do not believe it has anything to do with the Z-5500, as I changed nothing from when it always worked properly from the Realtek on my Z170 board.

Surround is controlled by the Z-5500 not the computer, at least that is how mine is setup.
My computer is just set to the optical port that I have connected to the Z-5500 and the controller on the Z-5500 sets the Speakers.
I have to ask you but are you running Windows 7?
I have mine setup all from the Z-5500

Cannot copy Test from the PDF Files from above

Not if you are using the Pass Through the optical port to your Speaker System.
 
I have to ask you but are you running Windows 7?

So, I bought a cheap sound card, and it appears to be working.
 
 

Another thing I am noticing; if I change the boot order so that my DVD drive is first, why does it seem to 'forget' and reset so that Windows boots first?

kelkel1
So, I bought a cheap sound card, and it appears to be working.

 
Sadly, the driver that I know works - Windows 7 64bit ver 6.0.101.1055, no longer seems to be available, at least not from a source I know & trust, there's also a newer driver, ver 6.0.101.1059, but again not from a source I know & trust. 
 
I was fortunate, I downloaded the audio drivers (driver only package - not including the extra software) directly from Creative a year before I even bought my z370 Classified K, which has the same audio as the z390 Dark.  
 
You can try downloading the Recon3D Windows 7 drivers from Creative, though the driver I downloaded was actually for the Recon3Di.  Or search for Creative driver 6.0.101.1059....
 
if all else fails, Microsoft has an older version driver in their catalog, 6.0.101.1043
 
Sorry I didn't get to this before you went and bought another sound card.
 

Zeddivile
4."Asus EZ Tool" to inject usb 3 and NVME drivers & fix (provided by the tool) If you are going to install Win7 on SATA a NVME drive installed in either board will sabotage installation process...

this guide on youtube includes adding NVMe drivers installed on the Win7 installation image so you have no issues installing to NVMe.  I followed it, installing from USB onto my 512GB Samsung 970 Pro, and had a fully up & running PC in less than an hour. Took much longer to install updates and software afterwards.  Most important part of the video is from 3:23 till 3:50....  and for NVMe 15:10 till 18:00