Dell Precision M6400 and NVME.

Greetings, just like I did with "NVME and M4400" I will do the same with this post of M6400 and NVME, and again for that reason I clarify that this post is only for informative purposes so that it remains as "historical" of a device (M6400) that does not have any type of current support, which is effectively END OF LIFE (EOL), it is not a doubt or a question it is only informative.

I performed the tests with the same 1TB NVME 2242 module using the Mini PCI EX to NVME adapter, and as you can see in the images for some reason the result of the benchmark was lower between 40 to 50 MBs less than in the case of M4400., speculating I imagine that it is due to the latencies of the ram perhaps? Since I understand that DDR2 latencies are much lower than DDR3, so in each DDR3 generation the latencies increase but anyway it is just a speculative hypothesis, the card was connected in the mini pci express socket named as "FCM" (Socket that does not support MSATA, only NVME devices or turbo memory or anything mini pci express), however the tests with SATA port deliver a speed higher than NVME.

This will also work in the WWAN port and BT port, the transfer speed will be the same in each port, but obviously my goal is to use the FCM port as a storage medium, the original function that it had when having a turbo memory unit installed (which failed) but which is usable today with a Mini pci express to NVME adapter.

As you can see in the photo, the adapter and the 2242 card fit perfectly without any problem, you can easily screw it in so the measurements suitable for that slot are 2242 and 2230, it will work with both and as for compatibility, once again I don't know what models exactly the M6400 BIOS can support, however in theory all NVME PCI express 3.0 are backwards compatible with 1.0, again I repeat I don't know what brands are and aren't compatible but I can assure you that the brand shown in the photos is compatible.

P.S.: I clarify that this is for informational purposes for LEGACY software, for those who want to use this port and have a little more storage, do not try to put MSATA drives or variants in the FCM port, it will not work, only NVME drives, the BIOS will not recognize the drive, but Windows/Linux will.