PCIe 4 M.2 to PCIe adapters may work for your use case as well.
You can probably crossflash the cheaper MCX512A-ACAT to the MCX512A-ADAT. There's plenty of threads on this board detailing the crossflashing steps.
SFP28 ports are backward compatible with SFP+
You're looking at E810 for Intel and ConnectX-5 Ex for Mellanox.
The big boys (Intel/Mellanox/Chelsio) isn't going to put PCIe4/5 on a 10Gig card because they don't need it.
In that case I wouldn't be surprised to learn it's attached to one of the CPU's x4 port instead of the chipset, since one of the supposed CPU NVMe slot is gen 3 instead of 4.
It's under archived version.
https://network.nvidia.com/products/adapter-software/firmware-tools/
Direct link for x64 debian .deb:
https://www.mellanox.com/downloads/MFT/mft-4.25.1-11-x86_64-deb.tgz
Slightly higher power usage as specified in the CX4 Lx datasheet, but the ASIC on both the MCX354A-FCBT and MCX4121A-ACUT runs at the same temperature with the same amount of airflow when I swapped the CX3 out for the CX4 Lx. I use both ports at 10GbE, using a DAC cable.
CX2 is pretty damn old with drivers that hasn't been updated in a few years.
CX4 Lx isn't really that expensive (~40-50usd) and you get more recent driver support.
Barring the CX4 Lx, the CX2 is just poor value proposition when CX3s cost a few bucks more.
idk maybe something is missing in your ESXi install. It works for me on a clean install of the latest version of ESXi8 U2.
You could live boot ubuntu or debian, then install mst and do the config from there instead too.
I figured that one out, albeit on an MCX4121A-XCAT. Even with J2/FNP shorted, you would still need to disable flash write protection, and the only way to do that is to use the OEM version of flint.
You do that on linux by including the "--oem" flag to the ./install.sh script.
#./install.sh...
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