Epoch estimates xAI's Colossus 1 at 276k H100-equivalents, 340MW and $12.9B capex
cis_female · x · 2026-10-27
Epoch AI's updated profile of xAI's Colossus 1 datacenter in Memphis estimates 276k H100-equivalents of AI compute (5.46e20 8-bit OP/s), 340MW of IT power, and $12.9B in capital cost, using an estimated mix of 150k H100, 50k H200 and 30k B200 chips with evaporative cooling.
The buildout timeline starts April 2024, reaching 25k H100s by August, 100k H100s by September 2024, and 200k H100e by February 2025. The poster also cites an estimate of 14.6 exaflops of fp64 compute, roughly 5x the top system on Top500.
Related event: xAI Colossus 1 hits ~14.6 exaflops FP64, five times Top500 leader(2 posts)→
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