With the rise of artificial intelligence, energy and thermal efficiency have once again become pressing concerns for companies that use and manufacture chips. The increasing demand for hardware to run AI models puts a strain on energy bills, as these servers require massive chip counts and massive cooling arrangements.
Vaire Computingbased in London and Seattle, is betting on it reversible calculation will be the way forward. Now it has raised $4 million in a seed round to work on making silicon chips that will consume negligible amounts of power and generate little, if any, heat. The round was led by deep tech funds 7 percent Ventures and Jude Gomila, the co-founder of Heyzap. The company previously raised $500,000, so this round brings its total funding to $4.5 million.
In reversible computation, instead of performing a computation in only one direction (inputs followed by outputs) and then feeding the output to a new computation and performing it again, the computation can be done in both directions (known as “time -reversible” calculation ). Essentially, the energy is stored inside the chip instead of being released as heat. The theory is that this method would produce negligible amounts of heat, greatly reducing energy consumption. (A better explanation of its capabilities is in this essay by Azeem Azhar and David Galbraith.)
Vaire Computing was founded by serial entrepreneur Rodolfo Rosini and Hannah Earley, a researcher at the University of Cambridge working on “unconventional computing” such as reversible and molecular computing.
In a call, Rosini told me, “Almost 100% of the energy in a chip ends up being dissipated as heat. So you’re basically wasting it. But in a reversible chip, you never actually dissipate that energy. You don’t let the energy become heat and recycle it internally. This means two things happen: One, the chip doesn’t get hot, and two, you only need a small amount of power to make it work. So it uses almost no energy, except for the same amount of energy that it just recycled.”
The concept of reversible computing isn’t new, and there are many challenges before Vaire’s chips become a reality, but Rosini believes that turning to this new approach to computing wouldn’t be too different from how we switched from incandescent bulbs to LEDs. “The similarity is between an old incandescent bulb and an LED,” he said. “LEDs are cooler and more efficient, and there is a cluster of them… This is almost identical to reversible computers. You don’t have a single core that’s super fast, you have lots of smaller cores where each one is super efficient.”
He says a big advantage of chips that can make reversible computers would be their ability to be used in general-purpose applications, the way regular CPUs are used today. “Other kinds of chips are domain-specific, but with computers, you can do anything… We could also make a CPU or a GPU, and it would look like any other chip.”
When asked why funding in the space is so low if the technology is as revolutionary as it sounds, Rosini said, “Because the amount of money that went into the reversible computer and the alternative chip architecture is almost nothing,” he said, pointing to the billions that were spent on quantum computing, photonics and GPUs.
“If you go outside these buzzing areas and talk about building brand new architecture, there is absolutely no one to fund it. Second, we don’t really need a lot of money to make the first chip and prove the technology… Once we prove that, we’ll need a much bigger round to actually make a chip,” he added.
For her part, Earley believes that reversible computing could be used to build the most powerful computers. “I got involved in this field during my PhD in 2016,” he said. “Unfortunately, my PhD supervisor sent me the thesis of my friend who was in the group at the University of Florida looking at reversible computing. It got me interested in how I could apply it to my research field at the time, which was molecular programming. I began to think that the reversible computer was interesting in its own right, particularly as it could make the most powerful form of computing possible. After completing my PhD, I was introduced to Rudolph and we realized that we had the same vision.”
“Vaire Computing is different because its technology is fundamentally innovative, positioning the company extremely well to capture a huge chunk of the future AI chip and ultimately the computer processor market,” said Andrew J Scott, founding partner 7percent Ventures. in a statement.
Also participating in the round were Seedcamp, Clim8, Tom Knight (inventor of modern reversible computing) and Jared Kopf, founder of Ramble.ai.
In addition, Vaire hired Mike Frank, a distinguished researcher in the field of reversible computing, as the company’s senior scientist.
Vaire recently became one of just 10 companies named in the second UK cohort of Intel Ignite, Intel’s global startup accelerator program for early stage deep technology startups.
