I've got a couple of Chelsio cards to add to the collection:
Chelsio T420-LL-CR is part number 110-1146-40 C0 - Chelsio T420 10GbE with Offload
Chelsio T420-CR is 110-1159-40 A0 - Chelsio T420 Low Latency 10GbE with Offload
There are both full offload cards, the LL-CR is a low-latency adapter.
These aren't OEM but there's no reference available anywhere listing Models and Part No.s, frequently the cards are listed on eBay by Part No exclusively.
A *little* late to this party . . . ok a LOT late.
110-1146-40 C0 should be a standard Chelsio T420-CR with Active (FAN) Cooling - not LL (Low Latency) and not SO (Server Offload). Rev C0 should have the copper heatsink with fan.
110-1159-40 A0 I believe are the "FC HBA" versions. However, in FreeNAS/TrueNAS and even Windows 10 they seem to work as a standard NIC. Rev A0 is the copper passive heatsink.
Both of these cards should share the PCB FAB 100-1120-00 Rev C
Server Offload cards typically will either be a different PCB FAB (and usually a shorter card) or will just not have the RAM populated.
I am not sure what makes a Low Latency Card - possibly faster RAM? I haven't dug that far into the components as I was just focused on finding compatible part numbers on the cheap. I can usually get a card on eFlea for between $10 and $50.
Chelsio 110-1146-40 e0 Dual Port SFP+ 10GbE T420
What SFP work for these? afbr-709smz FTLX8571D3BCL ? thanks!
110-1146-40 E0 should be a standard Chelsio T420-CR with Active (FAN) Cooling - not LL (Low Latency) and not SO (Server Offload). Rev E0 should have the aluminum heatsink with fan. This is what I run in my TrueNAS.
I haven't used a bunch of different SFP+ but I have used the Finisar FTLX8571D3BCL without any issues. I have some "Cisco" SFP-10G-SR and 10GBase-T (RJ45) adapters that I will be testing before then end of the year.
As far as driver support, I have been using a 110-1120-40 E0 in a Win 10 Pro machine with the UnifiedWire v5.0.0.57 drivers without any issues.
You can see my other post on here for more info:
Massive List of Chelsio T4xx and T5xx Part Numbers, FAB Numbers, and OEM Equivalents