The AMD Catalyst driver is not supported for RHEL 7 and the FirePro V7800.
The Catalyst Linux drivers for Linux recommend building the RPM for CENTOS 7. Building the RPM succeeds along with installing the RPM. The driver will fail once the machine is restarted.
Running the Catalyst Linux drivers directly to do the install will fail almost immediately. Notification is given that the driver is not supported for this operating system.