diff --git a/extra/gemm/cdna_asm_gemm.py b/extra/gemm/cdna_asm_gemm.py
index e9cb78e98a..e94cf6c252 100644
--- a/extra/gemm/cdna_asm_gemm.py
+++ b/extra/gemm/cdna_asm_gemm.py
@@ -122,7 +122,8 @@ def custom_mxfp4_gemm(C:UOp, A:UOp, B:UOp, scale_a:UOp, scale_b:UOp, *extra:UOp,
   groups_x, groups_y = UOp.special(ceildiv(N, tile_n), "gidx0"), UOp.special(ceildiv(M, tile_m), "gidx1")
   lds = UOp.placeholder((163840,), dtypes.uint8, 0, AddrSpace.LOCAL)
   sink = UOp.sink(C.base, A.base, B.base, scale_a.base, scale_b.base, *(x.base for x in extra), lds, threads, groups_x, groups_y,
-                  arg=KernelInfo(f"custom_mxfp4_gemm_{M}_{N}_{K}", estimates=Estimates(ops=2*M*N*K)))
+                  arg=KernelInfo(f"mxfp4_gemm_{M}_{N}_{K}",
+                                 estimates=Estimates(ops=2*M*N*K, mem=(M*half_k+N*half_k)*A.dtype.itemsize+M*N*C.dtype.itemsize)))
   insts = build_kernel(M, N, K, tile_m, tile_n)
   return UOp(Ops.PROGRAM, src=(sink, UOp(Ops.LINEAR, src=tuple(UOp(Ops.INS, arg=x) for x in insts))))