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Equation 12 · Part 1 · AI Accelerator Architecture in 2035: Scenarios, Signals, and Falsifiable Predictions

Symbol w_eff

weff=4.25w_{\mathrm{eff}} = 4.25
weffw_{\mathrm{eff}}

What this part means

wew_eff is part of the quantity the equation computes from the expression on the right.

Its job in the formula

wew_eff is part of the quantity the equation computes from the expression on the right.

The passage around this formula

with the second term the amortised metadata tax. The OCP MX alliance’s MXFP4 uses w = 4 , k = 32 , and an 8-bit shared scale, for weffw_{\mathrm{eff}} = 4.25 bits per element — a roughly 6% tax [ 4 ] . NVIDIA’s NVFP4 instead uses a smaller block, k = 16 , with the same 8-bit block scale plus a near-negligible per-tensor term, for weffw_{\mathrm{eff}} ≈\approx 4.5 bits per element — a roughly 12.5% tax [ 5 ] . The smaller block buys…

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Sources cited in the surrounding passage

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