Read title.... No there isn't unless you want to count sli or crossfire which isn't really 1024bit. 512bit is the max but who knows there may be such a gpu that may have been produced in limited quantities for corporate and military use. I remember reading up on a custom card that was produced for the FBI that featured 4 gpus in the late 90s using the voodoo2.
Yes I'm aware of the title and that there are no cards with a 1024 bit memory interface. I'm saying the original person who said they had a 1024 bit card was probably confusing the bus width with the amount of memory.
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.