Cerebras Systems' new deep-learning chip is as big as your keyboard, and the largest ever

No, you won't see this in your PC. But it's an eye-popping example of what CPU designers are thinking about as they design deep-learning chips for speeding up server workloads.

Credit: Cerebras Systems

If you’ve become accustomed to thinking of CPUs and GPUs that can fit in the palm of your hand, think again—Cerebras Systems says that it’s designed the largest chip ever, one that’s as large as your computer’s keyboard

Cerebras is scheduled to unveil this whopper of a chip tonight at the Hot Chips conference at Stanford University. While the largest GPU includes 21.1 billion transistors, and requires 815 square millimeters of die space, the Cerebras Systems chip includes 1.2 trillion transistors, and requires 46,225 square millimeters of silicon. That’s 71.64 square inches, or a rectangular chip that would measure about 8 inches by 9 inches. It’s so large that Cerebras published photos comparing it to a PC keyboard!

No, the Cerebras chip isn’t designed for your PC. But is it real? Cerebras says it is, already running customer workloads. However, the company also held back crucial details, such as the number of cores and the amount of memory, as well as how expensive it was to manufacture. Interestingly, it’s manufactured in a relatively old 16nm process technology from TSMC.

cerebras systems specs hot chips Cerebras Systems

The specifications of the Cerebras Systems chip.

Cerebras designed its chip for deep learning, what it calls a large and growing portion of data center workloads. Cerebras characterized its chip as a “wafer scale” implementation of a neural network, essentially clustering the logic, interconnect and memory onto a single piece of silicon. While manufacturing it may be costly, the company feels that on-chip interconnects are both faster and less expensive than building and connecting discrete cores. 

It’s the eye-popping size of the chip that can’t help but raise eyebrows, however. Consider: Intel’s original Itanium processor, code-named McKinley, was considered to be absolutely massive when it debuted in 2002 with 221 million transistors. But the Cerebras chip has over 5,000 times the transistors that McKinley did, at over 109 times the die size! Even IBM’s upcoming Power9 iteration, announced here at Hot Chips, has only 8 billion transistors.

cerebras systems baseball Cerebrus Systems

Here’s the Cerebras chip, shown against a baseball for additional scale.

Manufacturing such an enormous chip carries with it a number of significant challenges, including merely manufacturing and cooling it. Also, fabricating such an enormous chip without any manufacturing defects is simply impossible, Cerebras admits—every chipmaker suffers manufacturing defects, and a certain number of “bad” chips on every wafer are simply discarded. In the case of Cerebras, the company designs in redundant processing cores, anticipating that defects will render some of them unusable. (How many, though, the company hasn’t said.) An I/O fabric connecting one core to the next can route around any defective cores.

Cooling such a massive chip requires more than just a heat sink and a fan. Cerebras says a “cold plate” is attached above the silicon, using multiple vertically-mounted water pipes to cool the chip directly. Because the chip is too large to fit within any traditional package, Cerebras has designed its own, combining a PCB, the wafer, a custom connector linking the two, and the cold plate.

Numerous chips debut at the Hot Chips conference and are never seen again. Cerebras almost certainly will fall into the same category—you’ll never see anything like it in a PC, and it may not even survive long-term in the server space. But the appeal of Hot Chips is that you never know exactly what you’ll see—and the Cerebras processor is certainly amazing.

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.
Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.
Mark Hachman

Mark Hachman

PC World (US online)
Show Comments

Father’s Day Gift Guide

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Tom Sellers

MSI P65

This smart laptop was enjoyable to use and great to work on – creating content was super simple.

Lolita Wang

MSI GT76

It really doesn’t get more “gaming laptop” than this.

Jack Jeffries

MSI GS75

As the Maserati or BMW of laptops, it would fit perfectly in the hands of a professional needing firepower under the hood, sophistication and class on the surface, and gaming prowess (sports mode if you will) in between.

Taylor Carr

MSI PS63

The MSI PS63 is an amazing laptop and I would definitely consider buying one in the future.

Christopher Low

Brother RJ-4230B

This small mobile printer is exactly what I need for invoicing and other jobs such as sending fellow tradesman details or step-by-step instructions that I can easily print off from my phone or the Web.

Aysha Strobbe

Microsoft Office 365/HP Spectre x360

Microsoft Office continues to make a student’s life that little bit easier by offering reliable, easy to use, time-saving functionality, while continuing to develop new features that further enhance what is already a formidable collection of applications

Featured Content

Product Launch Showcase

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?