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AI Market · Forecast desk · Live · hardware

34%

NVIDIA publicly confirms a Rubin Ultra memory configuration at or below 512GB, or an 8-high HBM4E stack option, in official specifications or an earnings disclosure by March 31, 2027.

Probability history

0%25%50%75%100%08-15deadline

Called at 37% on August 15, 2026. Not yet repriced. 163 days to deadline.

How the number was built

Final method: stacked-fixed-weights (resolved n=74 < 80). Each rung is an independent estimate; the final is a stacked combination.

Stated (issue date)37%
Reference class (n=37)46%
Recalibrated49%
Feature model21%
Council31%
Final34%

Drivers

  • Reference class qtype:disclosure runs 0.46 (n=37) vs stated 0.37.
  • Hierarchical calibration moves stated 0.37 to 0.49 (lens hardware, kappa_stated=80.0, kappa_lens=200.0).
  • Feature model at 0.21: conjuncts=1, named disclosure=True, horizon=228d.
  • Council of 5 at 0.31.

Cautions

  • all 5 votes came from one vendor (openai); extremization disabled, persona diversity only

Council

5 personas on one model (openai/gpt-5.6-sol); other vendors were unavailable this run, so read this as one model's persona-averaged view, aggregated by log odds mean without extremization.

31%

grid and power economist · openai/gpt-5.6-sol

The deadline likely captures NVIDIA’s usual March GTC disclosure window, giving one credible opportunity for a definitive Rubin Ultra specification. However, the supplied digest contains no qualifying confirmation, and explicit corporate walk-backs are uncommon. A lower-memory configuration is plausible as HBM packaging and supply constraints force design tradeoffs, but NVIDIA may retain a higher headline figure, defer detailed specifications, or describe memory at a different system boundary. Because per-die, package, and rack definitions can be ambiguous—and ambiguity resolves against the forecaster—the disclosure base rate overstates the chance of resolution.

28%

semiconductor supply chain analyst · openai/gpt-5.6-sol

GTC 2027 is a natural venue for a Rubin Ultra specification update, but the required direction is unfavorable: NVIDIA must confirm no more than 512GB or explicitly retract a higher figure. A reduction of that magnitude would imply a material HBM4E density, qualification, or CoWoS-L design compromise. NVIDIA more commonly preserves an ambitious headline configuration while moving timing, binning availability, or volume ramp. Even if constraints force a change, it may avoid an explicit walk-back or omit the memory specification by the deadline; ambiguity and silence both miss.

31%

capital markets credit analyst · openai/gpt-5.6-sol

GTC 2027 is a natural venue for Rubin Ultra specifications, supporting some chance of a qualifying disclosure before the deadline. However, NVIDIA may provide only rack-level memory figures, while ambiguity over memory per die, package, or accelerator resolves against the event. Rubin Ultra’s flagship multi-die positioning also makes a configuration above 512GB credible. An explicit walk-back is unlikely absent a material product change. Overall, the forecaster’s 0.37 appears modestly high given the narrow wording and silence-as-miss rule.

31%

superforecaster statistician · openai/gpt-5.6-sol

I use 0.43 as the base rate, blending the >90-day disclosure rate (0.404) and disclosure-question rate (0.461), with limited weight on the broader hardware rate. I adjust downward because resolution requires an exact threshold or explicit walk-back in specified NVIDIA primary materials by a hard date; silence, continued use of a higher figure, or ambiguous system-level memory claims all miss. A likely GTC window before the deadline provides a credible disclosure opportunity, partly offsetting that penalty. The digest supplies no specific evidence of a ≤512GB configuration. The forecaster’s 0.3–0.4 calibration sample is too small to justify a meaningful correction.

34%

geopolitics regulation analyst · openai/gpt-5.6-sol

The deadline likely captures NVIDIA’s annual March GTC, providing a natural Rubin Ultra roadmap-update window. However, the rule requires a specific memory figure at or below 512GB or an explicit reversal—not merely updated performance, packaging, or rack specifications. NVIDIA often keeps prelaunch memory details provisional, while explicit walk-backs are uncommon. Rubin Ultra’s later launch timing also permits NVIDIA to defer a firm configuration beyond GTC 2027. The hardware reference class is favorable, but the longer-horizon disclosure classes and silence-as-miss rule justify a below-even estimate.

Evidence the engine used

direct · undated

NVIDIA GTC 2027 Returns to San Jose: Registration &amp; Updates

Cited by grid-and-power-economist: The deadline likely captures NVIDIA’s usual March GTC disclosure window, giving one credible opportunity for a definitive Rubin Ultra specification. However, the supplied digest contains no qualifying confirmation, and explicit corporate walk-backs are uncommon. A

direct · undated

NVIDIA Corporation - Home

Cited by grid-and-power-economist: The deadline likely captures NVIDIA’s usual March GTC disclosure window, giving one credible opportunity for a definitive Rubin Ultra specification. However, the supplied digest contains no qualifying confirmation, and explicit corporate walk-backs are uncommon. A