This comparison shows the ddr3 640 vs the Gddr5 7750. There is a 1gb model of the 640 with gddr5 which is probably more comparable to the 7750. I found it on ebay, but can't seem to find it anywhere else http://www.ebay.com/itm/NVIDIA-GeForce-GT-640-OEM-1GB-GDDR5-DVI-HDMI-DP-Video-Card-/121064905975?pt=PCC_Video_TV_Cards&hash=item1c3007dcf7