I bought a cheap used Chinese branded GPU (nvidia 1080) from ebay.  It is listed in the device manager but it has an exclamation mark next to it (google says that this indicates a driver issue).  It is listed in HWinfo but not in afterburner.  

On reddit someone said:

So I did some research on this card. It appears to be a very unknown Chinese brand with locked driver support. So it won’t run with the most recent NVIDIA drivers. Of course if you like tinkering with drivers. It’s still a reference 1080.

There’s also a ton of people complaining about its terrible driver support though when I google it further. You’ll have to use pre-400 series drivers from 2017. And since some games will require certain versions or newer, you won’t be able to run them, i.e. bf1 bf5

I was able to locate the driver on the manufacturer's site (http://www.xyingba.com/index.php/pro_v_116_147.html) but the latest driver is like version 377 from 2017.  

I had some trouble downloading the driver because it is hosted on baidu and you need an account to download it and you cant make an account without a chinese phone number.  thankfully someone was able to download it for me and they re-uploaded the driver here (http://www.mediafire.com/file/d7tm4cv2fyocdz0/377.35_win10_64bit_international-1022014-02.zip/file).  

After installing the driver I was able to see the gpu in my device manager as well as afterburner.  It ran games well and benched as expected for 1080 in PCMark.  But no mining programs recognized it.  just said that there is no device detected or no Cuda devices detected.  Im starting to think that the driver was released before cuda 9 and the two miners I tried dont have a version for earlier than cuda 9.  

What can I do?  Is it possible to run newer drivers on this gpu somehow?  Can I run any mining programs in the card's current state?  Or is there no option and this card is a dud?

EDIT: turns out it works in hive OS.  woo! hashes on eth ez pz.  so weird that its plug and play on linux but such a hassle on windows.

I'm sorry for dedicating an entire post to this troubleshooting issue but I've spent an entire day frustratingly trying to figure this out and I have exhausted all the resources I have found online

I've tried so many different BIOS settings and I can't get more than 9 GPUs working on this board.   Has anyone else found a working solution?

I have tried the f1 and latest BIOS versions.  I have the two molex cables connected to the mobo (not sure they are necessary with power risers).  Turned off mining mode, enabled 4g encoding. tried gen 1, 2, and 3 and also tried turning off the 24-119 entries in combination with each gen link speed.  With the latest version of the BIOS I could post with gen 1 link speed but windows wouldnt load (or it loaded but the screen was just black).  I couldn't even load more than 6 GPUs on the latest BIOS, aka when I connected the second PSU it wouldnt post.  

Anything else that I missed?

  

Will this rig of 10 gpus work as I have envisioned it? I am planning on plugging it into a standard US wall outlet. I assume its 15A so that would be about 1500-1600W. I want to get two 850W PSUs with 6 pcie connections and 6 peripheral connections. I would hook up one card to each of the pcie slots and run a molex cable to power two risers from each periph slot. each riser would be plugged into the motherboard via usb obviously. I would have 6 cases fans to start with (will add more if space permits) and they will be connected to the motherboard via splitters. The two psus will use an adapter to hook up to the atx board.

 i have some questions, assuming this set up is good to go.

1.Will this board support 10 gpus? I accidentally bought the b250 mining expert for 19 cards but that board can only do 7 nvidia cards at most. are there any such restrictions for this board?
2.the risers draw power from the psus, so do I have to add them to my estimates for power draw? every guide I have read so far says that I only need to calculate the wattage per gpu and add 150 for the fans, cpu and ram.
3.Can I plug the two wall socket plugs into a surge protector so that they only use one wall socket? or should each go into their own plugs on the wall socket?
4. Is it worth buying a used psu (like an evga g2) since the warranty isn't really covered for the second owner? I feel like having the 10 year warranty is a big plus.