Can you buy it and use it as expected of an off-the-shelf graphics card? No.
Why would you say that?
Yes you can, in the same sense of the Vampire 500 and 1200. You make a pre-order on this graphics card but just have to wait a few week for it to be built and arrive.
As for use it as an off the shelf product, of course you can, what else you going to do with it? Use it as a dinner plate?