The Tech Report writes NVIDIA's next-gen Tesla cards may come with ECC memory:
Adding ECC support would involve "arrays of 9 DRAMs (instead of 8), extra pins to connect to the extra DRAMs and more logic in the memory controllers." Those changes would increase costs, but Nvidia should be able to absorb those in the relatively high price tags it commands for workstation- and server-class GPUs.
In fact, Kanter believes this design decision is so straightforward that we'll see ECC memory support in the company's next-generation graphics hardware. It's not a matter of if but when, he says.