Hello.. Do you have any recommendation to x86 hardware.
I am interested only 1U server hardware.. Exalple Dell, Hp etc. Need 4xSFP+ ports ( 2 x intel 82599 dual port cards)

How about Dell R320, R620?? Or is it better use older Rx10 series? Any other good hardware?

thanks

If you intend to install ROS on bare metal, then you better wait for ROS v7. It will come with greatly improved support for modern NICs. If you intend to run CHR, then HW support is up to Hypervisor you're going to use.

In any case I'd go for CPU with smaller number of high-performance CPU cores ... with HyperThreading disabled. Number of CPU cores help with huge number of parallel IP streams, faster cores help to achieve better single connection performance and some other tasks (such as BGP convergence). If you'll go for a new server, then you won't be able to get anything less than 6-8 CPU cores which would already make pretty powerful router.

In any case I'd go for CPU with smaller number of high-performance CPU cores ... with HyperThreading disabled.

Some good examples of this are the Intel i7-10700k and AMD Ryzen 5600x.

We've also found that in addition to higher clock speeds, the amount of cache in the CPU helps with performance. Get more if you can afford it.