Welcome to the Intel Ice Lake D Era with the Xeon D-2700 and D-1700 series

Ice Lake Xeon is from last year (ish) so it has PCIe 4 and DDR4. Sapphire Rapids will have PCIe 5 and DDR5 later this year. Or you could try Octeon 10...

Yes, Ice lake is 10th gen "Intel core". PCIe Gen5 / DDR5 is a part of 12th Gen "Alder Lake". According to wikipedia, "Saphire Rapids" is the code name for the Xeon that is based on Alder Lake: https://en.wikipedia.org/wiki/Sapphire_Rapids, and which will have PCIe Gen5 / DDR5. I don't believe it is available yet, but there are leaked benchmarks to be found..

Xeon D is a niche part of the portfolio, it's not necessarily about providing the latest and greatest. The Xeon D family is meant for embedded, industrial, or communications use cases where you're expecting to run at 100% load for the life of the equipment (10 years). For context, "server" use condition CPUs like a Xeon Scalable processor is rated for 80% duty cycle for 5 years.

Also, Xeon D's have more tame clock speeds and overall TDP wattages as they are often used in rugged applications where cooling and wide ambient temps are huge considerations.

VyOS?