Andreessen Horowitz raises $1.1B for AI hardware, not software

Andreessen Horowitz has raised $1.1 billion for a fund that buys hardware instead of software. The firm announced the Machine Age Fund on 28 August 2026, saying it would invest across chips, memory, networking and storage, plus complete systems running from data centres to robotics to home AI appliances.

Five partners signed the announcement: Ben Horowitz, Martin Casado, Raghu Raghuram, David Ulevitch and David George. That’s an unusual amount of senior attention for one vehicle, and TNW read it as a measure of how central the firm considers the thesis. The thesis itself is that the binding constraint has moved out of the models and into the physical world.

The case rests on four figures about racks and buildings rather than on market sizing. All of them come from a16z’s own post.

Measure	Where it was	Where it is, or is heading
Compute density per rack	An H100 rack	28X higher in a Rubin rack
Rack power draw	Roughly 5 to 10 kW	100 to 250 kW now, 1MW within 3 years
Data centre scale	Tens of MW	Hundreds of MW, some GW-scale campuses
Hardware share of a16z deal flow	A small amount	Over 20%

The hardware industry supply side is used to growing 20% to 30% per year at most; not the triple-digit growth that’s needed to catch up with demand.

Ben Horowitz, Martin Casado, Raghu Raghuram, David Ulevitch and David George, via a16z

That gap is the whole pitch. A supply chain geared to 30% annual growth can’t feed racks whose power draw is heading for a megawatt, which is why the compute shortage stopped being a story about chips and became one about electricity and buildings.

a16z has been placing these bets already. SiliconANGLE reported that the firm backed Heron Power in 2025, a company building solid-state data centre transformers that use silicon carbide chips in place of the metal coil submerged in insulating liquid that standard transformers rely on. Volta Infrastructure Holdings, a data centre builder, and the chipmaker Unconventional are portfolio companies too, alongside Nexthop, Atoms and Mind Robotics.

The hardware money wasn’t the only money a16z moved that week. Three days later the firm said its fifth growth fund had reached $8.5 billion, up $1.75 billion since it launched in January at $6.75 billion, as TechCrunch reported. TNW counted more than $15 billion announced across new a16z funds in January, among them a $1.7 billion Infrastructure Fund 2 and a $1.18 billion American Dynamism Fund 2.

Other firms have been raising at similar scale. Kleiner Perkins took in $3.5 billion across two funds in March, one of them aimed at early-stage AI, and Thrive Capital raised $10 billion a month before that, per SiliconANGLE. So the raise itself isn’t the unusual part. Where a16z is pointing the money is.

What the firm hasn’t said matters as much as what it has. There’s no disclosure of limited partners, cheque sizes or stage focus, and no explanation of how the Machine Age Fund sits alongside the Infrastructure Fund raised seven months earlier. A search of the SEC’s EDGAR full-text index on 6 September 2026 returned no Form D naming the Machine Age Fund.

The people involved do come from the layer they’re now funding. Casado and Raghuram both held senior roles at VMware, and partner Guido Appenzeller is the former chief technology officer of Intel’s data centre business.

Watch where the first cheques land. If they go to transformers, substations and cooling rather than to accelerators, the firm means what it says about power being the limit, and the question of which layer of the AI stack keeps the money gets a different answer than it had a year ago.