diff --git a/configs/example/gpufs/runfs.py b/configs/example/gpufs/runfs.py
index 45c042a05f5..0fc3a326a29 100644
--- a/configs/example/gpufs/runfs.py
+++ b/configs/example/gpufs/runfs.py
@@ -123,6 +123,13 @@ def addRunFSOptions(parser):
         default=1,
         help="Set the number of dGPU directories (memory controllers",
     )
+    parser.add_argument(
+        "--dgpu-mem-locality",
+        type=int,
+        default=1,
+        help="Interleaving granularity (in cache lines) per dGPU directory; "
+             "1 stripes memory across directories at cache-line granularity",
+    )
     parser.add_argument(
         "--dgpu-mem-type",
         default="HBM_1000_4H_1x128",
diff --git a/configs/ruby/GPU_VIPER.py b/configs/ruby/GPU_VIPER.py
index 56d01b6d52e..2e465129e4d 100644
--- a/configs/ruby/GPU_VIPER.py
+++ b/configs/ruby/GPU_VIPER.py
@@ -697,7 +697,7 @@ def construct_gpudirs(options, system, ruby_system, network):
                 gpu_mem_range,
                 2 * i,
                 int(math.log(options.dgpu_num_dirs, 2)) + 1,
-                options.cacheline_size,
+                options.cacheline_size * options.dgpu_mem_locality,
                 xor_low_bit,
             )
             dram_intf_2 = MemConfig.create_mem_intf(
@@ -705,7 +705,7 @@ def construct_gpudirs(options, system, ruby_system, network):
                 gpu_mem_range,
                 2 * i + 1,
                 int(math.log(options.dgpu_num_dirs, 2)) + 1,
-                options.cacheline_size,
+                options.cacheline_size * options.dgpu_mem_locality,
                 xor_low_bit,
             )
         else:
@@ -714,7 +714,7 @@ def construct_gpudirs(options, system, ruby_system, network):
                 gpu_mem_range,
                 i,
                 int(math.log(options.dgpu_num_dirs, 2)),
-                options.cacheline_size,
+                options.cacheline_size * options.dgpu_mem_locality,
                 xor_low_bit,
             )