They announced their new Nvidia Drive PX2 – it's a fluid-cooled 12 core cluster with four GPU's that runs at 8 teraflops (8 trillion floating point operations per session – equivalent to a bunch of MacBook Pros.)
Why so much horsepower? They use it to run a high-performance deep-learning network – it's a technology that's used for machines to learn; in this case, it's learning about how to recognize objects and situations from information passed to it from cameras, lidar, radar and other sensors. With all this performance, deep-learning tasks that might have taken weeks to learn can now be done in a day.
They're working on a 3D display of what the machine "sees" – basically to provide riders confidence that it can see and react to the real world much faster than they could.
Volvo will be implementing the Nvidia platform first. Mercedez-Benz, Daimler and Audi are testing this hardware in their own test vehicles as well.
For more info see the Nvidia Blog.
Here's a video from CES.