We all know the cat /proc/cpuinfo etc for finding out the CPU information, but I had no idea how to find the model of the motherboard without checking my server spreadsheet list.
Enter DMIdecode.

Find Server Hardware Information
Show your current motherboard
dmidecode --type baseboard

You can also use:
bios
system
baseboard
chassis
processor
memory
cache
connector
slot

Find Networking Hardware
Show your current speed and duplex
dmesg | grep -i duplex

Or use ethtool
ethtool eth1