diff --git a/paddle/fluid/platform/cudnn_workspace_helper.h b/paddle/fluid/platform/cudnn_workspace_helper.h
index 58f76e3128e4b4c5b8cd54a495413de0eabe790e..29abdc72e264b3676dec29c6be3fd8c4e1510dfe 100644
--- a/paddle/fluid/platform/cudnn_workspace_helper.h
+++ b/paddle/fluid/platform/cudnn_workspace_helper.h
@@ -17,7 +17,7 @@
 namespace paddle {
 namespace platform {
 
-static constexpr int kDefaultConvWorkspaceSizeLimitMB = 4096;
+static constexpr int kDefaultConvWorkspaceSizeLimitMB = 512;
 
 }  // namespace platform
 }  // namespace paddle