diff --git a/.specstory/history/2025-12-11_18-21Z-compress-png-sequences-with-multithreading.md b/.specstory/history/2025-12-11_18-21Z-compress-png-sequences-with-multithreading.md
index b56e414..d4d6c18 100644
--- a/.specstory/history/2025-12-11_18-21Z-compress-png-sequences-with-multithreading.md
+++ b/.specstory/history/2025-12-11_18-21Z-compress-png-sequences-with-multithreading.md
@@ -3941,3 +3941,30 @@ _**Agent (model default, mode Agent)**_
 
 ---
 
+
+The **7800X3D should win** for this script.
+
+**7800X3D:**
+- 8 cores, 16 threads → script uses 16 worker processes
+- Zen 4 (2023)
+- Strong single-threaded performance
+- Higher IPC
+
+**Threadripper 1950X:**
+- 16 cores, 32 threads → script uses 32 worker processes
+- Zen 1 (2017)
+- Lower single-threaded performance
+- Lower IPC
+
+**Why the 7800X3D wins:**
+1. Per-core performance: Each worker finishes faster, so 16 fast workers can outperform 32 slower ones.
+2. Architecture gap: Zen 4 vs Zen 1 is a large IPC improvement.
+3. PNG compression: PIL operations benefit from faster cores; the 7800X3D’s cores are roughly 2–3x faster per core.
+
+**Expected performance:**
+- The 7800X3D should be roughly 30–50% faster, depending on I/O.
+
+**Bottom line:** The 1950X’s extra threads don’t offset the 7800X3D’s much faster cores. The 7800X3D is the better choice for this workload.
+
+---
+