Need a small form factor card suitable for Hyper-V DDA


I am looking for someone who can name an nvidia card that can be used with Hyper-V's discrete device assignment (DDA), that has a small form factor, because the server mainboard allows a maximum length of 180mm.
Which ones could I take? Max price is 500 USD.
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☠ MASQ ☠Commented:
This seems to be a deliberate challenge ;)

1) nVidia???  With most of the AMD R9 cards apparently doing this "out of the box"
2) Maximum length 180mm - rules out most of the gaming cards - not that they natively support GPU-Passthrough anyway but some can apparently be "tweaked".
3) 500 USD - so not allowed to go for the obvious GRID/Tesla's which will also should do this without effort

So that leaves the Quaddro's which are small enough and cheap enough but don't formally have any DDA "badge of approval"

They seem to sometimes work with GPU-Passthough but this doesn't seem to be consistent and might be eintirely down to gewtting a card with the right BIOS configuration.  Forums show users successfully using almost entry level cards but others not being able to even get them recognised in the hypervisor.  It seems to be a "black art".

I'm interested too in if you solve this with the rules you've set.  I've played with GPU-Passthrough which seems very similar technology to game on a VM but not under the rules of this thread.
McKnifeAuthor Commented:

We hardly ever use anything but nvidia.
If you can recommend an AMD card that has such a small form factor and works and that is below 500US$, so be it. Please name it, too
☠ MASQ ☠Commented:
AMD R9 Radeon Fury X
Tiny, less than $400, works with GPU-Passthrough so should be OK with DDA provided systemboard supports it as well (SR-IOV Gen 2 IIRC)
Also think you need this to be separate from the host's primary GPU - at least during set-up.
Note this is all based on my assumption that GU-Passthrough and DDA work the same way.
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McKnifeAuthor Commented:
That link leads me nowhere. Could you link it again, please?
☠ MASQ ☠Commented:
Sorry, cut the wrong chunk of the URL
Should be edited and working now

NB you'll notice it needs a cooling fan mounted somewhere else on the case ...  (But the card is small)
McKnifeAuthor Commented:
Gee, that would be my first watercooled device!
☠ MASQ ☠Commented:
I'll turn you into a gamer yet :)
McKnifeAuthor Commented:
I would even try this but only the nano version of that card is small enough (could it be you confused inch with centimeters?). 7.1 inch maximum length.
is the R9 nano capable of GPU passthrough? Hard to find AMD info on this.
☠ MASQ ☠Commented:
AFAIK all the R9's support passthrough
I thought the nano was the same length but the other dimensions bigger to accommodate the fan.

Yes we aren't allowed to use centimetres now in preparation for Brexit!
McKnifeAuthor Commented:
Do you know this new definition?
"to brexit = saying good-bye but never leaving"
I guess you heard enough jokes already.

Thanks so far, I think we will risk it and simply buy a used nano for testing. I'll let you know if it works once we installed it. Hear you in a week or so.
McKnifeAuthor Commented:
Card arrived, but the server will not even boot with it! No idea why since it boots in any other device I tested with. Server gets stuck at POST. Bios is the latest already. Too bad. Will return the card.

So the question remains open!
☠ MASQ ☠Commented:
You connected it via the 8-pin external power feed?
Sounds like it doesn't get on with the systemboard.
McKnifeAuthor Commented:
Yes, that 8er powerfeed is connected. Doesn't like the board, yes... It's an older serverboard Intel 2600CP with 2018er bios.
☠ MASQ ☠Commented:
Question then over whether the board will support passthrough correctly even if you find a GFX card that does and is compatible.

This seems to be the story with older Intel/Supermicro
McKnifeAuthor Commented:
Thing is: the AMD card cannot even be installed on server 2016. The driver refuses to. On server 2019, installation works, but after assigning it to the VM, the VM does not even start...

So no AMD, please. Still open to other suggestions.
McKnifeAuthor Commented:
I am giving up- Thanks MASQ.
There does not seem to be any suitable Nvidia card at that size and price segment. Too bad.

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☠ MASQ ☠Commented:
NP - sorry this didn't work - post an update when you do find something that does this.
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