Breakout-cable Friendly NICs for NIC to NIC DAC'ing?

[staph]

Mellanox's 4-to-1 breakout cables are for making a single switch port into 4 switch ports, but I'd rather breakout a single QSFP28 NIC port into 4 SFP28 that I can then directly attach to SFP28 NIC ports from separate server.

Seems like the CX4 cards won't work with this, which is a shame because their prices seem to be getting better on eBay.

 

[Rand__]

https://www.servethehome.com/hpe-620qsfp28-4x-25gbe-single-qsfp28-port-ethernet-adapter-review/

Not sure if it actually works but the only thing thats even close I've seen in ages

 

[ServerUser]

Hardly any NICs support reverse breakout. Check Intel, this doc suggests the 800 Series NICs may well support it:

https://downloadmirror.intel.com/28933/eng/epct_1_35_62_1.txt