Long rows of black server racks dotted with blue and green lights run down an old brick warehouse under exposed steel roof trusses and skylights, yellow cable trays above them and a polished concrete floor between, a worker walking away in the distance toward a tall arched window.

The Build-Out

Colossus 2 Adds ‘Gun Range’ and ‘Spam,’ Musk Says

Elon Musk says ‘Gun Range,’ with 220,000 Nvidia GB300s for training, is on track for the end of November, and ‘Spam,’ about 200,000 for inference, for December.

MEMPHIS, Oct. 31 — Elon Musk said on Saturday that Gun Range, a building being added to xAI’s Colossus 2 data center in the Memphis area, would hold 220,000 of Nvidia’s GB300s configured for training and was on track to be operational by the end of November. A second, Spam, would follow in December with about 200,000 configured for inference.

Two others, Macroharder and Minihard, already have 220,000 GB300s each, Mr. Musk wrote on X. Across the four buildings he named, that comes to about 860,000, by our sum; he gave no figure for the power they will draw.NVDANasdaq178.67▼7.97−4.3%Nvidia · Monday’s session His post gave no total for the whole site.

“I walked the whole Colossus 2 site around midnight and again this morning,” he wrote. “Good progress by the SpaceX team and contractors.” xAI, the maker of the Grok chatbot, was acquired by SpaceX, Business Insider notes; Mr. Musk built the first Colossus in Memphis in 2024, and construction of Colossus 2 began last year, it reports.

Spam, Mr. Musk wrote, “used to house Hormel products.” Configured for inference, it needs “much simpler networking and less than half the fiber,” by his account; the GB300s in the training buildings have “800 gig nics,” he wrote.The GB300Nvidia’s GB300 NVL72 is a liquid-cooled rack that joins 72 Blackwell Ultra graphics processors and 36 Grace CPUs, with 800 gigabits a second of network connectivity for each GPU, by Nvidia’s description. WMC Action News 5 reported that the buildings take their names from a former local gun range and a former Hormel facility. Neither its report nor Mr. Musk’s post gave an address for either.

Power is where the campus has met resistance. The day before Mr. Musk’s post, a federal judge in Mississippi refused to dismiss the NAACP’s Clean Air Act suit over the gas turbines in Southaven that, the complaint says, supply power to Colossus 2.The TurbinesAt least 27 gas-fired turbines stood at the plant as of April 7, with a combined generating capacity of at least 495 megawatts, the complaint says, as the judge’s Oct. 30 order recites it. The order does not decide liability, but it rejects the argument that the turbines were exempt from permitting as mobile sources. SpaceX’s Oct. 22 quarterly report describes them as “mobile gas turbines powering the COLOSSUS II data center with the permission of the Mississippi Department of Environmental Quality.” Residents near Memphis “have packed public hearings, staged protests, and created petitions opposing the campuses,” Business Insider noted.

Serving users is costly, too, by Mr. Musk’s own account. On Sunday he wrote that “the cost of serving Grok Bot was unsustainably high relative to revenue,” as quoted by Anadolu, replying to a user who asked whether xAI could reset the weekly usage allowance of Grok Bot, an AI agent it launched in early beta in August. He gave no figures for cost or revenue, Anadolu reported.

For Nvidia, the post puts dates on about 420,000 more GB300s in two buildings, by our sum. The near test is the calendar: whether Gun Range is running by the end of November, as Mr. Musk says it is “tracking” to be, and Spam in December. Nvidia reports its fiscal third quarter on Nov. 17, with a call at 5 p.m. Eastern.

Sources

  1. Elon Musk, on X, “Post on Macroharder, Minihard, Gun Range and Spam (reply to @herbertong),” Oct. 31, 2026.
  2. U.S. District Court for the Northern District of Mississippi, “NAACP v. X.AI Corp., No. 3:26-cv-00074-DMB-JMV, Opinion and Order denying the defendants’ motion to dismiss (Doc. 139),” Oct. 30, 2026.
  3. SpaceX (Form 10-Q, U.S. Securities and Exchange Commission), “Quarterly report for the quarter ended Sept. 30, 2026,” Oct. 22, 2026.
  4. Nvidia, “NVIDIA GB300 NVL72.”
  5. Nvidia, “NVIDIA Sets Conference Call for Third-Quarter Financial Results,” Oct. 28, 2026.
  6. WMC Action News 5, “Elon Musk confirms data center expansion in the Mid-South,” Oct. 31, 2026.
  7. Business Insider, “Elon Musk says he is taking over an old Spam factory and a gun range to expand his Colossus 2 AI complex,” Nov. 1, 2026.
  8. Anadolu, “Musk says cost of running Grok Bot ‘unsustainably high’ relative to revenue,” Nov. 2, 2026.