diff --git a/bom_replace_alphax_4ch-h.csv b/bom_replace_alphax_4ch-h.csv
index 2c9774d9b..d250e9ab5 100644
--- a/bom_replace_alphax_4ch-h.csv
+++ b/bom_replace_alphax_4ch-h.csv
@@ -10,6 +10,9 @@ R131,
 R143, 
 ############# MM SETUP ###############
 
+# 4chan now prefers F42x for extra RAM
+U105,"STM32F427","LQFP144","C117816"
+
 # DC-DC Inductor
 L421,"MWSA0503S-100MT","MWSA0503","C408412"