diff --git a/comfy/model_patcher.py b/comfy/model_patcher.py
index 2f9be07d8..6b25436f2 100644
--- a/comfy/model_patcher.py
+++ b/comfy/model_patcher.py
@@ -1423,7 +1423,10 @@ class ModelPatcherDynamic(ModelPatcher):
             return None
         vbar = self.model.dynamic_vbars.get(self.load_device, None)
         if create and vbar is None:
-            vbar = comfy_aimdo.model_vbar.ModelVBAR(self.model_size() * 1.2, self.load_device.index)
+            # x10. We dont know what model defined type casts we have in the vbar, but virtual address
+            # space is pretty free. This will cover someone casting an entire model from FP4 to FP32
+            # with some left over.
+            vbar = comfy_aimdo.model_vbar.ModelVBAR(self.model_size() * 10, self.load_device.index)
             self.model.dynamic_vbars[self.load_device] = vbar
         return vbar