diff --git a/invokeai/app/api/routers/model_manager.py b/invokeai/app/api/routers/model_manager.py
index 77335f5bac..2136c416b2 100644
--- a/invokeai/app/api/routers/model_manager.py
+++ b/invokeai/app/api/routers/model_manager.py
@@ -3,6 +3,7 @@
 
 import io
 import pathlib
+import shutil
 import traceback
 from copy import deepcopy
 from enum import Enum
@@ -863,19 +864,20 @@ async def set_cache_size(
         # Try to apply the target state.
         cache.max_vram_cache_size = vram_new
         cache.max_cache_size = ram_new
-        app_config.max_cache_size = ram_new
-        app_config.max_vram_cache_size = vram_new
+        app_config.ram = ram_new
+        app_config.vram = vram_new
         if persist:
             app_config.write_file(new_config_path)
             shutil.move(new_config_path, config_path)
     except Exception as e:
         # If there was a failure, restore the initial state.
-        cache.max_vram_cache_size = vram_old
         cache.max_cache_size = ram_old
-        app_config.max_cache_size = ram_old
-        app_config.max_vram_cache_size = vram_old
+        cache.max_vram_cache_size = vram_old
+        app_config.ram = ram_old
+        app_config.vram = vram_old
 
         raise RuntimeError("Failed to update cache size") from e
+    return value
 
 
 @model_manager_router.get(
diff --git a/invokeai/backend/model_manager/load/load_default.py b/invokeai/backend/model_manager/load/load_default.py
index 13ba02a2a8..bf8e6a3ce2 100644
--- a/invokeai/backend/model_manager/load/load_default.py
+++ b/invokeai/backend/model_manager/load/load_default.py
@@ -66,6 +66,7 @@ class ModelLoader(ModelLoaderBase):
         return (model_base / config.path).resolve()
 
     def _load_and_cache(self, config: AnyModelConfig, submodel_type: Optional[SubModelType] = None) -> ModelLockerBase:
+        stats_name = ":".join([config.base, config.type, config.name, (submodel_type or "")])
         try:
             return self._ram_cache.get(config.key, submodel_type, stats_name=stats_name)
         except IndexError: