diff --git a/sota-implementations/dqn/config_atari.yaml b/sota-implementations/dqn/config_atari.yaml
index 021e7fd6132..bcbada5dc36 100644
--- a/sota-implementations/dqn/config_atari.yaml
+++ b/sota-implementations/dqn/config_atari.yaml
@@ -7,7 +7,7 @@ env:
 # collector
 collector:
   total_frames: 40_000_100
-  frames_per_batch: 16
+  frames_per_batch: 1600
   eps_start: 1.0
   eps_end: 0.01
   annealing_frames: 4_000_000
@@ -38,7 +38,7 @@ optim:
 loss:
   gamma: 0.99
   hard_update_freq: 10_000
-  num_updates: 1
+  num_updates: 100
 
 compile:
   compile: False
diff --git a/sota-implementations/dqn/config_cartpole.yaml b/sota-implementations/dqn/config_cartpole.yaml
index 58be7fb3bb5..199533ba9be 100644
--- a/sota-implementations/dqn/config_cartpole.yaml
+++ b/sota-implementations/dqn/config_cartpole.yaml
@@ -7,7 +7,7 @@ env:
 # collector
 collector:
   total_frames: 500_100
-  frames_per_batch: 10
+  frames_per_batch: 1000
   eps_start: 1.0
   eps_end: 0.05
   annealing_frames: 250_000
@@ -37,7 +37,7 @@ optim:
 loss:
   gamma: 0.99
   hard_update_freq: 50
-  num_updates: 1
+  num_updates: 100
 
 compile:
   compile: False
diff --git a/sota-implementations/dqn/dqn_atari.py b/sota-implementations/dqn/dqn_atari.py
index f6bcf3044cb..ae012cadec8 100644
--- a/sota-implementations/dqn/dqn_atari.py
+++ b/sota-implementations/dqn/dqn_atari.py
@@ -9,7 +9,7 @@
 """
 from __future__ import annotations
 
-import tempfile
+import functools
 import warnings
 
 import hydra
@@ -20,7 +20,7 @@
 from torchrl._utils import timeit
 
 from torchrl.collectors import SyncDataCollector
-from torchrl.data import LazyMemmapStorage, TensorDictReplayBuffer
+from torchrl.data import LazyTensorStorage, TensorDictReplayBuffer
 from torchrl.envs import ExplorationType, set_exploration_type
 from torchrl.modules import EGreedyModule
 from torchrl.objectives import DQNLoss, HardUpdate
@@ -64,20 +64,26 @@ def main(cfg: "DictConfig"):  # noqa: F821
     )
 
     # Create the replay buffer
-    if cfg.buffer.scratch_dir is None:
-        tempdir = tempfile.TemporaryDirectory()
-        scratch_dir = tempdir.name
+    if cfg.buffer.scratch_dir in ("", None):
+        storage_cls = functools.partial(LazyTensorStorage, device=device)
+        transform = None
     else:
-        scratch_dir = cfg.buffer.scratch_dir
+        storage_cls = functools.partial(
+            LazyTensorStorage, scratch_dir=cfg.buffer.scratch_dir
+        )
+
+        def transform(td):
+            return td.to(device)
+
     replay_buffer = TensorDictReplayBuffer(
         pin_memory=False,
-        prefetch=3,
-        storage=LazyMemmapStorage(
+        storage=storage_cls(
             max_size=cfg.buffer.buffer_size,
-            scratch_dir=scratch_dir,
         ),
         batch_size=cfg.buffer.batch_size,
     )
+    if transform is not None:
+        replay_buffer.append_transform(transform)
 
     # Create the loss module
     loss_module = DQNLoss(
@@ -210,7 +216,6 @@ def update(sampled_tensordict):
         for j in range(num_updates):
             with timeit("rb - sample"):
                 sampled_tensordict = replay_buffer.sample()
-                sampled_tensordict = sampled_tensordict.to(device)
             with timeit("update"):
                 q_loss = update(sampled_tensordict)
             q_losses[j].copy_(q_loss)
diff --git a/sota-implementations/dqn/dqn_cartpole.py b/sota-implementations/dqn/dqn_cartpole.py
index 69689dd4c92..4fde452fba9 100644
--- a/sota-implementations/dqn/dqn_cartpole.py
+++ b/sota-implementations/dqn/dqn_cartpole.py
@@ -55,11 +55,7 @@ def main(cfg: "DictConfig"):  # noqa: F821
     # Create the replay buffer
     replay_buffer = TensorDictReplayBuffer(
         pin_memory=False,
-        prefetch=10,
-        storage=LazyTensorStorage(
-            max_size=cfg.buffer.buffer_size,
-            device="cpu",
-        ),
+        storage=LazyTensorStorage(max_size=cfg.buffer.buffer_size, device=device),
         batch_size=cfg.buffer.batch_size,
     )