amdmeminfo
Get GDDR5 memory information from these AMD Radeon GPUs: HD7870, HD7950, HD7970, HD7990, R9 270(x), R9 280x, R9 290(x)
Installation and usage:
Download ZIP or via Github client.
sudo apt-get install libpci-dev
Unzip
cd amdmeminfo-master/
make
sudo cp amdmeminfo /usr/local/bin/
amdmeminfo