HP Server card holds 4x MXM cards on sale.

[Br14nfüd]

I think it might be an error, there is an HP server MXM adapter card for $25.  (Usually 250)

 

Best jump on it if it's something you might need: https://www.ebay.com/itm/176949987213

The card will hold 4x MXM cards, appears to have a PCI switch onboard, so potentially good performance.  I will be trying what MXM cards I have in it.  M600, Tesla P4, P4000, M3000 etc.  Seems like a good deal.  You can even get 3080m for decent-ish prices
I use NvCleanInstall to add the hardware ID to the drivers if necessary.  I am assuming the power connector is a CPU style pinout, 4x 12v and 4x Ground.  I ordered one.

I plan to use a short PCI-e Riser because the card is low to the board behind the slot connector and will probably hit motherboard components depending on the board.

 

No Video outputs, but could potentially be used for gaming with integrated outputs or a different GPU for output.

 

Seems to have a heatsink of sorts built into it too.

[Br14nfüd]

Only Info I can find is HPE ProLiant WS460c Gen9 Graphics Server Blade:

https://support.hpe.com/connect/s/product?language=en_US&kmpmoid=7829634&tab=All&cep=on&manualsFilter=66000005%2C66000045

 

Digging around it says the MXM slots only have an x8 link, the PCI-E slot is a x16 though. under " HPE MultiGPU carrier card (single, carrier only)" :

 

https://support.hpe.com/hpesc/public/docDisplay?docId=c04627081&docLocale=en_US#N1078A

 

It looks like a popular configuration was dual Tesla compute MXM, which makes sense because the x16 switch would not bottleneck going into dual x8.

 

The 4th MXM slot is Type A (the short style) only, but the other 3 are for Type B cards.