diff --git a/architecture/powerpc/config.in b/architecture/powerpc/config.in
index 19f096c77..3c950920d 100644
--- a/architecture/powerpc/config.in
+++ b/architecture/powerpc/config.in
@@ -41,7 +41,9 @@ choice ROCKCFG_POWERPC_OPT generic \
 	604e		"Optimised for 604e"				\
 	620		"Optimised for 620"				\
 	740		"Optimised for 740"				\
-	750		"Optimised for 750"				\
+	750		"Optimised for 750 (G3)"			\
+	7400		"Optimised for 7400 (older G4)			\
+	7450		'Optimised for 7450 (newer G4)"			\
 	403		"Optimised for 403"				\
 	505		"Optimised for 505"				\
 	801		"Optimised for 801"				\