Gigabyte now offers GeForce GTX 960 in 4GB versions
GIGABYTE Video Card Original GTX 960 4GB 128Bit GDDR5
Amazon.com: MDZZ Video Card Fit for GIGABYTE GTX 960 4GB Graphics Cards 128Bit GDDR5 GPU Card for NVIDIA Geforce GV-N960WF2OC-4GD Hdmi Dvi : Electronics