diff --git a/crates/gpu-deepseek41/src/block.rs b/crates/gpu-deepseek41/src/block.rs
index d3a8d33f4..eb24fbc34 100644
--- a/crates/gpu-deepseek41/src/block.rs
+++ b/crates/gpu-deepseek41/src/block.rs
@@ -227,6 +227,12 @@ pub struct KBlockKernels {
 }
 
 impl KBlockKernels {
+    /// The device bytes the kernels hold beside their modules: the K-gemv's
+    /// expert ids.
+    pub fn device_bytes(&self) -> usize {
+        self.gemv.device_bytes()
+    }
+
     /// Load the three into `gpu`'s context. Load-time only.
     ///
     /// # Errors
diff --git a/crates/gpu-gates/src/bin/gate_nemotron_serve.rs b/crates/gpu-gates/src/bin/gate_nemotron_serve.rs
index 821699c52..d8d4c6633 100644
--- a/crates/gpu-gates/src/bin/gate_nemotron_serve.rs
+++ b/crates/gpu-gates/src/bin/gate_nemotron_serve.rs
@@ -163,8 +163,8 @@ mod gate {
     fn plan_only_names_its_default(
         dir: &Path,
         file: &Path,
-        ok: &mut bool,
-    ) -> Result<Option<u64>, GateError> {
+    ) -> Result<(Option<u64>, bool), GateError> {
+        let mut ok = true;
         let limit = trained_ctx(file)?;
         let (status, log, text) = plan(dir, "plan", file, &[])?;
         let place = log.first(&record::PLACE_UNSET)?;
@@ -233,19 +233,16 @@ mod gate {
             default_ok = line_ok && held && stands && above_short;
         }
         check(
-            ok,
+            &mut ok,
             "plan_only_names_its_default",
             exits && in_order && word_a && no_load && default_ok,
         );
-        Ok(ctx_line(&text).and_then(|l| field(l, "ctx")))
+        Ok((ctx_line(&text).and_then(|l| field(l, "ctx")), ok))
     }
 
     /// `parallel_above_one_is_refused` (the module header).
-    fn parallel_above_one_is_refused(
-        dir: &Path,
-        file: &Path,
-        ok: &mut bool,
-    ) -> Result<(), GateError> {
+    fn parallel_above_one_is_refused(dir: &Path, file: &Path) -> Result<bool, GateError> {
+        let mut ok = true;
         let (status, log, text) = plan(dir, "refuse-parallel", file, &["--parallel", "2"])?;
         let named = text.contains(ONE_SEQUENCE);
         let no_plan = log.first(&record::PLAN)?.is_none();
@@ -258,11 +255,11 @@ mod gate {
             println!("refuse-parallel stderr:\n{text}");
         }
         check(
-            ok,
+            &mut ok,
             "parallel_above_one_is_refused",
             !status.success() && named && no_plan,
         );
-        Ok(())
+        Ok(ok)
     }
 
     /// The ids `NemotronHModel` gives stepped directly: for each prompt, from an empty cache, the
@@ -306,8 +303,8 @@ mod gate {
         file: &Path,
         default_ctx: Option<u64>,
         layers: u64,
-        ok: &mut bool,
-    ) -> Result<Option<Answers>, GateError> {
+    ) -> Result<(Option<Answers>, bool), GateError> {
+        let mut ok = true;
         let d = dir.join("serve");
         std::fs::create_dir_all(&d)?;
         let (cmd, mut all) = command(file)?;
@@ -319,8 +316,8 @@ mod gate {
             Ok(addr) => addr,
             Err(e) => {
                 println!("the server never listened: {e}");
-                check(ok, "load_and_listen", false);
-                return Ok(None);
+                check(&mut ok, "load_and_listen", false);
+                return Ok((None, ok));
             }
         };
         let text = std::fs::read_to_string(&err_log).unwrap_or_default();
@@ -345,7 +342,7 @@ mod gate {
             listen.line()
         );
         check(
-            ok,
+            &mut ok,
             "load_and_listen",
             same_ctx && loaded && ctx_is_plans && in_order,
         );
@@ -373,15 +370,18 @@ mod gate {
                 println!("{name}: {e}");
                 false
             });
-            check(ok, name, pass);
+            check(&mut ok, name, pass);
         }
         println!("server stopped: {}", s.stop()?);
-        Ok(Some(Answers {
-            prose,
-            turn,
-            prose_answer,
-            turn_answer,
-        }))
+        Ok((
+            Some(Answers {
+                prose,
+                turn,
+                prose_answer,
+                turn_answer,
+            }),
+            ok,
+        ))
     }
 
     /// `edit_resend_is_a_fresh_run` (the module header): the slot holds the prose prompt and its
@@ -428,7 +428,8 @@ mod gate {
     }
 
     /// `completion_ids` (the module header), the server stopped and the session on the card.
-    fn completion_ids(file: &Path, a: &Answers, ok: &mut bool) -> Result<(), GateError> {
+    fn completion_ids(file: &Path, a: &Answers) -> Result<bool, GateError> {
+        let mut ok = true;
         let ids = session_ids(file, &[a.prose.as_slice(), a.turn.as_slice()])?;
         let prose = agree(&a.prose_answer.tokens, &a.prose_answer.stop, &ids[0]);
         let turn = agree(&a.turn_answer.tokens, &a.turn_answer.stop, &ids[1]);
@@ -438,8 +439,8 @@ mod gate {
             a.prose_answer.tokens.len(),
             a.turn_answer.tokens.len()
         );
-        check(ok, "completion_ids", prose && turn);
-        Ok(())
+        check(&mut ok, "completion_ids", prose && turn);
+        Ok(ok)
     }
 
     pub fn run() -> Result<(), GateError> {
@@ -454,11 +455,13 @@ mod gate {
         )?;
         drop(split);
         let mut ok = true;
-        let default_ctx = plan_only_names_its_default(&dir, &file, &mut ok)?;
-        parallel_above_one_is_refused(&dir, &file, &mut ok)?;
-        let answers = served(&dir, &file, default_ctx, layers, &mut ok)?;
+        let (default_ctx, pass) = plan_only_names_its_default(&dir, &file)?;
+        ok &= pass;
+        ok &= parallel_above_one_is_refused(&dir, &file)?;
+        let (answers, pass) = served(&dir, &file, default_ctx, layers)?;
+        ok &= pass;
         if let Some(a) = answers {
-            completion_ids(&file, &a, &mut ok)?;
+            ok &= completion_ids(&file, &a)?;
         }
         if !ok {
             return Err(checks_failed());
diff --git a/crates/gpu-glm5next/src/body.rs b/crates/gpu-glm5next/src/body.rs
index 930050d78..d72c8d7d4 100644
--- a/crates/gpu-glm5next/src/body.rs
+++ b/crates/gpu-glm5next/src/body.rs
@@ -2376,6 +2376,7 @@ impl ChainBody for Body {
                 .nextn
                 .as_deref()
                 .map_or(0, |n| n.resident_bytes() + n.arena_bytes())
+            + self.k.block.as_ref().map_or(0, KBlockKernels::device_bytes)
     }
 
     fn layers(&self) -> Range<usize> {
diff --git a/crates/gpu-mimo2/src/body.rs b/crates/gpu-mimo2/src/body.rs
index e930ca76d..37018bcc0 100644
--- a/crates/gpu-mimo2/src/body.rs
+++ b/crates/gpu-mimo2/src/body.rs
@@ -1215,6 +1215,7 @@ impl ChainBody for Body {
                 .taps
                 .as_ref()
                 .map_or(0, |t| t.iter().map(DeviceBuffer::num_bytes).sum())
+            + self.k.block.as_ref().map_or(0, KBlockKernels::device_bytes)
     }
 
     fn layers(&self) -> Range<usize> {
diff --git a/crates/gpu/src/arch/nemotron_h/body.rs b/crates/gpu/src/arch/nemotron_h/body.rs
index a31ffe2f4..d0cd3b0cc 100644
--- a/crates/gpu/src/arch/nemotron_h/body.rs
+++ b/crates/gpu/src/arch/nemotron_h/body.rs
@@ -74,9 +74,6 @@ impl GpuModel<Body> {
 impl Body {
     fn load(gpu: &Gpu, file: &Split, w: &mut Weights, ctx: usize) -> Result<Body, GpuError> {
         let hp = Hparams::read(file).map_err(|e| GpuError::plan(WHAT, e))?;
-        if ctx == 0 {
-            return Err(GpuError::shape(WHAT, "a cache of 0 rows"));
-        }
         let ssm = hp.ssm;
         let mamba = mamba2::check(
             WHAT,
@@ -359,7 +356,11 @@ impl ChainBody for Body {
                 Layer::Mlp(_) => 0,
             })
             .sum();
-        layers + self.s.bytes() + self.acts.bytes() + self.r.num_bytes()
+        layers
+            + self.s.bytes()
+            + self.acts.bytes()
+            + self.r.num_bytes()
+            + self.k.kgemv.device_bytes()
     }
 
     fn layers(&self) -> Range<usize> {
diff --git a/crates/gpu/src/arch/nemotron_h/step.rs b/crates/gpu/src/arch/nemotron_h/step.rs
index b95fe12a0..93f50cbc8 100644
--- a/crates/gpu/src/arch/nemotron_h/step.rs
+++ b/crates/gpu/src/arch/nemotron_h/step.rs
@@ -191,6 +191,7 @@ impl Scratch {
             + self.words.num_bytes()
             + self.pos.num_bytes()
             + self.n_keys.num_bytes()
+            + self.mamba.device_bytes()
     }
 
     /// The scratch for `sh`, the widest `ff` an MLP layer has and the
diff --git a/crates/gpu/src/arch/qwen3moe/body.rs b/crates/gpu/src/arch/qwen3moe/body.rs
index 54356daa8..95da8ec6b 100644
--- a/crates/gpu/src/arch/qwen3moe/body.rs
+++ b/crates/gpu/src/arch/qwen3moe/body.rs
@@ -1022,6 +1022,7 @@ impl ChainBody for Body {
             + self.ub.bytes()
             + self.taps.as_ref().map_or(0, |t| t.buf.num_bytes())
             + self.placed.as_ref().map_or(0, Placed::device_bytes)
+            + self.k.q35.as_ref().map_or(0, |k| k.kgemv.device_bytes())
     }
 
     fn layers(&self) -> Range<usize> {
diff --git a/crates/gpu/src/arch/qwen3moe/body35.rs b/crates/gpu/src/arch/qwen3moe/body35.rs
index daf5178ea..d52fffedf 100644
--- a/crates/gpu/src/arch/qwen3moe/body35.rs
+++ b/crates/gpu/src/arch/qwen3moe/body35.rs
@@ -3193,6 +3193,7 @@ impl ChainBody for Body35 {
                 .as_ref()
                 .map_or(0, |d| d.resident_bytes() + d.scratch_bytes())
             + self.placed.as_ref().map_or(0, Placed::device_bytes)
+            + self.k.q35.as_ref().map_or(0, |k| k.kgemv.device_bytes())
     }
 
     fn layers(&self) -> Range<usize> {
diff --git a/crates/gpu/src/mamba2.rs b/crates/gpu/src/mamba2.rs
index f2b7f9ba7..d4d74146b 100644
--- a/crates/gpu/src/mamba2.rs
+++ b/crates/gpu/src/mamba2.rs
@@ -473,6 +473,11 @@ pub struct Mamba2Scratch {
 }
 
 impl Mamba2Scratch {
+    /// The device bytes the scratch holds.
+    pub(crate) fn device_bytes(&self) -> usize {
+        self.part.num_bytes() + self.done.num_bytes()
+    }
+
     /// A zeroed scratch for `shape`. Load-time only. `shape` is checked again
     /// here, so a conv the host accepted and this kernel refuses never
     /// allocates.
diff --git a/crates/gpu/src/site.rs b/crates/gpu/src/site.rs
index c8511b979..482caa25c 100644
--- a/crates/gpu/src/site.rs
+++ b/crates/gpu/src/site.rs
@@ -336,6 +336,12 @@ pub struct KGemvKernels {
 }
 
 impl KGemvKernels {
+    /// The device bytes the kernels hold beside their modules: the one
+    /// expert's ids.
+    pub fn device_bytes(&self) -> usize {
+        self.one.num_bytes()
+    }
+
     /// Load the `_sel` family into `gpu`'s context, raising into its fault
     /// word, and zero the ids. Load-time only.
     pub fn load(gpu: &Gpu) -> Result<KGemvKernels, GpuError> {