diff --git a/comfy/supported_models.py b/comfy/supported_models.py
index 1eb4f2beb..9bcebf6dc 100644
--- a/comfy/supported_models.py
+++ b/comfy/supported_models.py
@@ -608,6 +608,8 @@ class PixArtAlpha(supported_models_base.BASE):
     unet_extra_config = {}
     latent_format = latent_formats.SD15
 
+    memory_usage_factor = 0.5
+
     vae_key_prefix = ["vae."]
     text_encoder_key_prefix = ["text_encoders."]
 
@@ -640,6 +642,8 @@ class HunyuanDiT(supported_models_base.BASE):
 
     latent_format = latent_formats.SDXL
 
+    memory_usage_factor = 1.3
+
     vae_key_prefix = ["vae."]
     text_encoder_key_prefix = ["text_encoders."]