From 783f8fb66490836d71e79dbdece65b2a1002b152 Mon Sep 17 00:00:00 2001
From: igneum-labs <337424239+igneum-labs@users.noreply.github.com>
Date: Thu, 8 Oct 2026 12:09:22 +0000
Subject: [PATCH] Class v6 floor lane 3: section 2.2a, the shadowed rows at the
 5090's knee in both k conventions, absolute first (3.8x / 2.0x at W = 4; the
 record's 6.1x / 3.3x marked)

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

Documents-only replay of d550dadda (8e9588de0) for the box mirror master
---
 docs/analysis/class-v6/floor/sram-and-floor.md | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/docs/analysis/class-v6/floor/sram-and-floor.md b/docs/analysis/class-v6/floor/sram-and-floor.md
index b9541e1ae..6ee42dc8a 100644
--- a/docs/analysis/class-v6/floor/sram-and-floor.md
+++ b/docs/analysis/class-v6/floor/sram-and-floor.md
@@ -122,6 +122,22 @@ energy is 3 to 13 percent of the chip's energy per hash once the shadow is paid,
 by 0.2x to 0.7x. The one honest width lever is `W = 4` now (measured free) and `W = 8` after one measurement; the
 public text's number against this die is the shadow's, not the memory's.
 
+### 2.2a The same rows against the 5090 at its knee, in both conventions (absolute first)
+
+At the 1,300 MHz lock the card pays 1.67 microjoules at class v3 and 0.65 for the class v4 shadow (measured, 6.5 pJ
+per counted op). Two conventions price the die's shadow core. **Absolute**: the core costs what it costs, `k` fixed
+against the stock 11.3 pJ, so the die pays `k x 1.10` microjoules whatever the card does; this is the physics and the
+headline. **The record's**: `k` against the card's op cost at the same operating point, so the die pays `k x 0.65`
+at the lock; it flatters the die at the lock by 1.6x and is carried marked. At stock the two coincide (section 2.2).
+The `k` lane's RTL rows re-fold these in absolute before 20:00.
+
+| `W` | Absolute, k 0.5 / 1 | The record's convention (marked), k 0.5 / 1 | Label |
+|---|---|---|---|
+| 1 | 4.0x / 2.0x | 6.4x / 3.4x | modelled |
+| 4 | **3.8x / 2.0x** | 6.1x / 3.3x | modelled |
+| 8 | **3.7x / 2.0x** | 5.8x / 3.2x | modelled |
+| 16 | 3.4x / 1.9x | 5.2x / 3.0x | modelled |
+
 Sensitivity: the wire at 0.65 pJ per bit halves every wire term (`W = 1` 0.20 nJ, 83x; `W = 8` 0.35 nJ, 49x); at 2.6
 pJ per bit doubles it (`W = 1` 0.35 nJ, 47x; `W = 8` 0.95 nJ, 18x). The macro at 0.2 nJ adds 0.1 nJ to every row. The
 shadowed rows move under 0.3x across the whole band.