diff --git a/candle-examples/examples/moondream/main.rs b/candle-examples/examples/moondream/main.rs
index bcc21337..dfd83037 100644
--- a/candle-examples/examples/moondream/main.rs
+++ b/candle-examples/examples/moondream/main.rs
@@ -283,6 +283,11 @@ async fn main() -> anyhow::Result<()> {
     let start = std::time::Instant::now();
     let device = candle_examples::device(args.cpu)?;
     let config = moondream::Config::v2();
+    let dtype = if device.is_cuda() && !args.quantized {
+        DType::F16
+    } else {
+        DType::F32
+    };
     let model = if args.quantized {
         let vb = candle_transformers::quantized_var_builder::VarBuilder::from_gguf(
             &model_file,
@@ -291,15 +296,16 @@ async fn main() -> anyhow::Result<()> {
         let model = quantized_moondream::Model::new(&config, vb)?;
         Model::Quantized(model)
     } else {
-        let vb =
-            unsafe { VarBuilder::from_mmaped_safetensors(&[model_file], DType::F32, &device)? };
+        let vb = unsafe { VarBuilder::from_mmaped_safetensors(&[model_file], dtype, &device)? };
         let model = moondream::Model::new(&config, vb)?;
         Model::Moondream(model)
     };
     println!("loaded the model in {:?}", start.elapsed());
 
     let start = std::time::Instant::now();
-    let image = load_image(args.image)?.to_device(&device)?;
+    let image = load_image(args.image)?
+        .to_device(&device)?
+        .to_dtype(dtype)?;
     let image_embeds = image.unsqueeze(0)?;
     let image_embeds = match model {
         Model::Moondream(ref m) => image_embeds.apply(m.vision_encoder())?,
diff --git a/candle-transformers/src/models/mixformer.rs b/candle-transformers/src/models/mixformer.rs
index 65a1665a..de15c3a5 100644
--- a/candle-transformers/src/models/mixformer.rs
+++ b/candle-transformers/src/models/mixformer.rs
@@ -135,7 +135,9 @@ fn get_mask(size: usize, device: &Device) -> Result<Tensor> {
 
 fn masked_fill(on_false: &Tensor, mask: &Tensor, on_true: f32) -> Result<Tensor> {
     let shape = mask.shape();
-    let on_true = Tensor::new(on_true, on_false.device())?.broadcast_as(shape.dims())?;
+    let on_true = Tensor::new(on_true, on_false.device())?
+        .to_dtype(on_false.dtype())?
+        .broadcast_as(shape.dims())?;
     let m = mask.where_cond(&on_true, on_false)?;
     Ok(m)
 }
@@ -147,7 +149,7 @@ struct RotaryEmbedding {
 }
 
 impl RotaryEmbedding {
-    fn new(dim: usize, max_seq_len: usize, dev: &Device) -> Result<Self> {
+    fn new(dim: usize, max_seq_len: usize, dtype: DType, dev: &Device) -> Result<Self> {
         let inv_freq: Vec<_> = (0..dim)
             .step_by(2)
             .map(|i| 1f32 / 10000f32.powf(i as f32 / dim as f32))
@@ -159,8 +161,8 @@ impl RotaryEmbedding {
             .reshape((max_seq_len, 1))?;
         let freqs = t.matmul(&inv_freq)?;
         Ok(Self {
-            sin: freqs.sin()?,
-            cos: freqs.cos()?,
+            sin: freqs.sin()?.to_dtype(dtype)?,
+            cos: freqs.cos()?.to_dtype(dtype)?,
         })
     }
 
@@ -274,7 +276,8 @@ impl MHA {
         let op_size = cfg.n_embd;
         let wqkv = linear(cfg.n_embd, 3 * op_size, vb.pp("Wqkv"))?;
         let out_proj = linear(op_size, cfg.n_embd, vb.pp("out_proj"))?;
-        let rotary_emb = RotaryEmbedding::new(cfg.rotary_dim, MAX_SEQ_LEN, vb.device())?;
+        let rotary_emb =
+            RotaryEmbedding::new(cfg.rotary_dim, MAX_SEQ_LEN, vb.dtype(), vb.device())?;
         let softmax_scale = 1f64 / (head_dim as f64).sqrt();
         Ok(Self {
             wqkv,