Radeon HD 7900 Linux Mint 18 Driver Installation
How to Download and Install Radeon HD 7900 Linux Mint 18 Driver.
The following Instructions shows the AMD Radeon Software Crimson Edition Proprietary Linux Graphics Driver Installation.

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Open a Shell Terminal emulator window
(Press “Enter” to Execute Commands)In case first see: Terminal QuickStart Guide.
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Download AMD ATI Radeon Driver in Linux Mint 18
Grab the Ubuntu 15.04 Version.
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Double-Click on Archive and Unzip into /tmp.
Or from Shell:unzip -d /tmp/ radeon-crimson*.zip
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Run the Radeon Linux Mint Driver Installer
Change to the Target directory:cd /tmp/fglrx*
Execute the script with:
sudo ./amd-driver-installer*.run
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Then Follow the Installation Wizard.