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Celestial AI Secures $250 Million to Enhance AI Chip Connectivity

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Silicon Valley-based startup Celestial AI has raised an additional $250 million in venture capital, bringing its total funding to $515 million. The company aims to accelerate AI computing by leveraging photonics—a technology that uses light instead of electrical signals—to enhance the speed of data transfer between AI processing and memory chips.

Memory bandwidth, which determines the efficiency of AI systems, is a crucial factor in chip performance and a key consideration in U.S. government export controls aimed at limiting China’s AI capabilities. Currently, Nvidia dominates this space with its proprietary NVLink and NVSwitch technologies, prompting a surge in investments to develop alternative solutions. Celestial AI’s competitors, Lightmatter and Ayar Labs, have raised $850 million and $370 million, respectively, in similar efforts.

Celestial AI is backed by AMD Ventures, the investment arm of Nvidia’s competitor Advanced Micro Devices (AMD). The company is working on a “photonic fabric” that acts as a high-speed bridge between multiple chips. According to CEO Dave Lazovsky, the technology improves efficiency by reducing energy consumption and latency while saving valuable chip space.

“There are no good answers outside of Nvidia,” Lazovsky said in an interview at Celestial AI’s headquarters in Santa Clara, California. “What we’ve created with photonic fabric achieves similar functionality but with superior energy efficiency and lower latency.”

The funding round was led by Fidelity Management & Research and included BlackRock, Maverick Capital, Tiger Global Management, and former Cadence Design Systems CEO Lip-Bu Tan. Existing investors such as AMD Ventures, Koch Disruptive Technologies, Singapore’s state investor Temasek, and Porsche Automobil Holding also participated.

EU Approves Synopsys’ $35 Billion Ansys Acquisition with Conditions

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The European Commission has given the green light to Synopsys’ $35 billion acquisition of Ansys, with conditions designed to address competition concerns. The deal, which was announced in January 2024, will see Synopsys, a leading chip design software maker, acquire Ansys, a company known for its software used in various industries, from aerospace to sports equipment manufacturing.

To alleviate concerns about reduced competition in certain software markets, the Commission required both companies to divest key products. Synopsys has agreed to sell its optics and photonics software, while Ansys will divest its PowerArtist software. These divestitures are intended to maintain sufficient competition in the global markets for optics, photonics, and power consumption analysis tools used in chip design.

However, the deal can only proceed after the European Commission approves the buyers of these divested products in a separate review process.

The acquisition comes at a time when companies like Nvidia and Intel are developing increasingly complex chips and the computing systems that house them. Synopsys’ tools are focused on chip design, while Ansys provides software for evaluating the larger electronic systems that incorporate these chips, making the acquisition complementary for both parties.