[bangaladore]

> There are DDR4 interposers you can buy for 50$.

Indeed, you can buy a piece of fiberglass shaped correctly for 50$. That's not the hard part. Just the probe you are supposed to connect to such a PCB is > 1k USD per pin you need to sample. The oscilloscope / logic analyzer to sample it is likely 6-7 figures.

> Or you can use an FPGA to interpose the RAM and intercept the network traffic for a couple hundred bucks.

What FPGA solution do you have for a couple hundred bucks could interpose DDR4 RAM at any frequency? This number seems completely made up to me.

[vablings]

I do think a large portion of the huge price for this equipment is that it is very niche and only a few mfg's eg keysight/agilent make this kind of stuff.

Im sure if the DMA market goes way of the RAM bus sniffing its will be a year or two before mass produced products are on the market that can sniff the traffic without much reduction in signal quality and maximum data rate.