The is an extremely old graphics controller based on the Rage 6 architecture . Finding a native, official driver specifically for Windows Server 2016 is difficult because the hardware reached "End-of-Life" (EOL) long before the OS was released .
: If Windows claims the best driver is already installed, choose "Let me pick from a list of available drivers," click "Have Disk," and navigate to the .inf file in your extracted folder. Hardware Specifications Ati Es1000 Driver Windows Server 2016