Rebellions had its new AI accelerator running at Hot Chips 2025. Notably, the Rebellions REBEL-Quad uses four HBM3E sites for 144TB of memory, but also uses UCIe as its chiplet interconnect. We have been covering UCIe for years, and this is a modern chip using the chiplet interconnect and proudly marketing it.
Rebellions REBEL-Quad UCIe and 144TB HBM3E Accelerator at Hot Chips 2025
Here is the package built around Samsung SF4X and CoWoS-S. There are four compute ASICs, four HBM3E sites, and four intergrated silicon capacitors (ISC) on each package. It is interesting that this is a dual PCIe Gen5 x16 interface card. Given that NVIDIA GB300 will be ushering in PCIe Gen6, and we are seeing a development board for the REBEL-Quad, it feels like maybe this could have been PCIe Gen6 to match NVIDIA. The other big one is that this is using UCIe-A to provide big bandwidth.
Here is a REBEL-Quad card which is a PCIe card.
Here is the package. You can see how it gets its “Quad” name with the four sets of silicon.
Many companies show off silicon packages, but we saw something else. The company had its new chip running on a development board.
Here it is running a live Llama 3.3 70B demo. For some STH readers who focus more on AI accelerators, this is a new piece of hardware up and running. For those who follow chip technology, here is a UCIe chip working.
For those wondering Llama 3.3 70B in this demo was running at 35.5 msec(avg)/token for its output. As you can see, however, this is a development board.
Final Words
What a cool thing to see running. Whenever I chat with the UCIe folks, I ask when we will see running products. The answer I get is usually that it is up to each company to market that they are using UCIe since it is inside the package. Now we have a great example of where that is happening. It also says a lot that they have something that is integrating this many pieces of silicon in a large package and they are showing it running. Many AI accelerator companies have accelerator ideas, but more often than not those ideas do not turn into even silicon running public demos. Congratulations to the Rebellions team (and the UCIe folks) on this one.