Diamond buys compute without a substation. Two Chinese suspensions expire 17 days apart.
Akash says diamond-cooled servers add up to 22 percent FLOPs per watt to hardware that already exists. Synthetic diamond and the CVD reactors that grow it sit under MOFCOM Announcement 55, paused to November 10. Gallium sits under Announcement 46, paused to November 27.
Every bottleneck this desk has tracked for a year has been a construction bottleneck. Transformers, turbines, substations, enrichment, transmission that has been costed against transmission only drawn. The answer is always the same shape: build the thing, wait three years.
There is a second answer, and it is a materials answer. Put a better thermal conductor between the GPU and the heat sink, stop the chip throttling, and take more compute out of a megawatt you already have. No permit, no interconnection study, no queue. DCD published a long read this morning on the company selling it [DCD, September 15, 2026]. The product is shipping. The supply chain underneath it runs through two Chinese export-control announcements that are suspended rather than repealed, and that restart seventeen days apart this November.
What’s happening
- Akash Systems launched Diamond Cooled AI servers on AMD Instinct MI350X GPUs, built by MiTAC Computing (3706.TW), on March 3, 2026. It reports up to 10°C (18°F) reduction on GPU and High Bandwidth Memory, up to 22 percent additional FLOPs per watt at roughly 75°F ambient, up to 15 percent token throughput improvement at roughly 120°F, and up to 100 percent less power dedicated to cooling [Akash Systems, March 3, 2026].
- The same release reports $300 million received for an initial launch order and up to $1 million of incremental value per server over four years. Backers are Khosla Ventures and Founders Fund [Akash Systems, March 3, 2026].
- Diamond removes heat about five times faster than copper, the industry standard for heat management [Akash Systems, March 3, 2026].
- The argument is retrofit, not rebuild. Co-founder and CCO Pamit Surana told DCD roughly 90 percent of the installed base is air-cooled, that Akash can open a server, add diamond and close it inside two to three weeks, and that operators “don’t have to wait for approvals” [DCD, September 15, 2026].
- Akash sources diamond from Asia, Europe and the United States, and wants to build its own reactors to synthesize diamond domestically in America [DCD, September 15, 2026].
Two numbers, one company
Surana told DCD the server-level gain is 70 percent, repeated as “70 percent more tokens out of the same megawatt.” Akash’s March release publishes up to 22 percent FLOPs per watt and up to 15 percent throughput [DCD, September 15, 2026; Akash Systems, March 3, 2026]. Those are not the same claim. The published figure is the one that ships here.
Same discipline on funding. DCD describes a $68 million CHIPS Act grant “secured” in 2024. The underlying announcement is a non-binding preliminary memorandum of terms with the Department of Commerce, composed of $18.2 million in proposed direct funding and $50 million in combined federal and California state tax credits [Akash Systems, November 13, 2024]. That is a different instrument from a grant received.
China angle: one wafer, two suspended regimes
GaN-on-diamond is gallium nitride bonded to synthetic diamond. Both halves are controlled, and both controls are paused.
On October 9, 2025, MOFCOM and the General Administration of Customs published Announcement No. 55, covering synthetic diamond and super-hard materials: powders, single crystals, wire saws, grinding wheels, and DC-plasma CVD equipment. On November 7, 2025, MOFCOM suspended it and five siblings until November 10, 2026. Separately, Announcement No. 46 of December 3, 2024 provided that licence applications to export gallium, germanium, antimony and superhard materials to the United States would not be approved as a principle; its Article 2 was suspended on November 9, 2025 until November 27, 2026 [Pillsbury, November 13, 2025].
Read the equipment line in Announcement 55 again. DC-plasma CVD equipment is the reactor. A US company that wants to grow its own diamond domestically is describing capital equipment sitting on a Chinese control list that is paused and has a restart date. Pillsbury’s assessment is that although enforcement is on hold, the legal framework remains intact [Pillsbury, November 13, 2025].
Seventeen days separate the two restarts (desk arithmetic). A product needing both gallium and synthetic diamond has two calendars, not one.
Brazil angle: the queue without a seat in the wafer
Brazil is the cleanest test case for a retrofit thesis anywhere, and owns none of the inputs.
This desk reported on September 7 that EPE data center connection requests reached 26.2 gigawatts while the only transmission package studied, costed and recommended is R$1.6 billion in São Paulo, opening roughly 4 gigawatts [Tantalum Strategy Desk, September 7, 2026, citing EPE]. That gap is the exact condition under which extracting compute from installed capacity beats promising new capacity.
Redata sharpens it. The regime the Senate approved on September 1 conditions its tax benefit on, among other counterparts, a water efficiency index at or below 0.05 litre per kWh on an annual cooling average [Tantalum Strategy Desk, September 4, 2026, citing agência eixos, September 1, 2026]. A vendor claiming up to 100 percent less power dedicated to cooling is aimed squarely at that counterpart, and the high ambient claim is worth more in Fortaleza than in Dublin.
Brazil supplies no part of the wafer. This desk reported on June 6 that Brazil runs the largest bauxite-to-alumina circuit outside China and recovers no gallium from it, with no operator having announced recovery at Alunorte, Paragominas or MRN [Tantalum Strategy Desk, June 6, 2026]. There is no Brazilian CVD reactor industry. The country that most needs compute per megawatt buys the entire stack.
US angle
GaN-on-diamond left the country and came back. Felix Ejeckam sold the patents to Element Six, the synthetic diamond company founded by De Beers, in 2013, and he and his co-founders bought them back in 2016. Commercial traction is partly offshore: the $27 million NxtGen contract placed first units with an Indian sovereign cloud operator, delivered in February of this year [DCD, September 15, 2026]. The technology is domestic. The feedstock and the reactors are not yet.
What it means
TAI printed 103.2 on the latest weekly update, materials (TAI-M) at 102.2 and power (TAI-P) at 106.2, SOV50 at 112.8, SDX at 101.1 [Tantalum indexes, updated September 12, 2026]. Both TAI legs fell, power slightly more than materials, so this is not a rotation. It is both sides of the input stack repricing together.
Against that, diamond cooling is the first credible instance of the opposite trade to everything this desk has covered: buying compute from hardware already energized rather than building new. If 22 percent holds at scale, it is the cheapest incremental capacity available, because it needs no interconnection.
The catch is that the escape hatch runs through the same chokepoint as everything else. Gallium and synthetic diamond are both Chinese-controlled, both suspended, both back on the calendar inside the same November. A workaround that depends on Beijing declining to un-pause two announcements is a hedge with a printed expiry date.
What to watch
- November 10, 2026. Expiry of the suspension covering Announcement No. 55: synthetic diamond, super-hard materials, DC-plasma CVD equipment. Watch whether MOFCOM extends, refines, or lets it lapse [Pillsbury, November 13, 2025].
- November 27, 2026. Expiry of the suspension of Article 2 of Announcement No. 46, covering gallium, germanium, antimony and superhard materials bound for the United States [Pillsbury, November 13, 2025].
- Q4 2026. Akash told DCD it debuts a cooling option for Nvidia’s next platform this quarter [DCD, September 15, 2026]. A named hyperscaler order, rather than a sovereign cloud or neocloud, is the signal retrofit has cleared procurement at the operators that set capex.
