Fir grins, check this GPU out on Newegg:http://www.newegg.com/Product/Product.aspx?Item=N82E16814125254
It states that its Memory Interface is 896 (448 x 2)-bit. Really just SLI, but is a clever marketing ploy rather than a technical capability.
The bottom line is that these are no 1024-bit memory buses in either the desktop or workstation class GPUs....today. However, I am sure you could dig up more clever marketing that would tell potential customers they offer such CF or SLI solutions that have 512*2=1024 offerings just waiting on the shelves.