Enable async offload by default for AMD. (Comfy-Org#11534)

Author: comfyanonymous

comfy/model_management.py

@@ -1019,8 +1019,8 @@ def force_channels_last():
 if args.async_offload is not None:
     NUM_STREAMS = args.async_offload
 else:
-    #  Enable by default on Nvidia
-    if is_nvidia():
+    #  Enable by default on Nvidia and AMD
+    if is_nvidia() or is_amd():
         NUM_STREAMS = 2
 
 if args.disable_async_offload: