diff --git a/configs/ruby/GPU_VIPER.py b/configs/ruby/GPU_VIPER.py
index f8a7386f80..c3e146bf0c 100644
--- a/configs/ruby/GPU_VIPER.py
+++ b/configs/ruby/GPU_VIPER.py
@@ -443,8 +443,8 @@ def construct_dirs(options, system, ruby_system, network):
 
         dir_cntrl.triggerQueue = MessageBuffer(ordered = True)
         dir_cntrl.L3triggerQueue = MessageBuffer(ordered = True)
-        dir_cntrl.requestToMemory = MessageBuffer()
-        dir_cntrl.responseFromMemory = MessageBuffer()
+        dir_cntrl.requestToMemory = MessageBuffer(ordered = True)
+        dir_cntrl.responseFromMemory = MessageBuffer(ordered = True)
 
         dir_cntrl.requestFromDMA = MessageBuffer(ordered=True)
         dir_cntrl.requestFromDMA.in_port = network.out_port
@@ -452,9 +452,6 @@ def construct_dirs(options, system, ruby_system, network):
         dir_cntrl.responseToDMA = MessageBuffer()
         dir_cntrl.responseToDMA.out_port = network.in_port
 
-        dir_cntrl.requestToMemory = MessageBuffer()
-        dir_cntrl.responseFromMemory = MessageBuffer()
-
         exec("ruby_system.dir_cntrl%d = dir_cntrl" % i)
         dir_cntrl_nodes.append(dir_cntrl)