diff --git a/driver/conv.cu b/driver/conv.cu
index feb665d96c..7852e9bed7 100644
--- a/driver/conv.cu
+++ b/driver/conv.cu
@@ -357,7 +357,7 @@ int main()
     constexpr unsigned C  = 1;
     constexpr unsigned HI = 34;
     constexpr unsigned WI = 34;
-    constexpr unsigned K  = 4;
+    constexpr unsigned K  = 1;
     constexpr unsigned S  = 3;
     constexpr unsigned R  = 3;
 #elif 1
diff --git a/driver/device_implicit_gemm_convolution_2_cnhw_srck_knhw.cuh b/driver/device_implicit_gemm_convolution_2_cnhw_srck_knhw.cuh
index 9585113fb9..6ee62008cc 100644
--- a/driver/device_implicit_gemm_convolution_2_cnhw_srck_knhw.cuh
+++ b/driver/device_implicit_gemm_convolution_2_cnhw_srck_knhw.cuh
@@ -67,29 +67,29 @@ void device_implicit_gemm_convolution_2_cnhw_srck_knhw(InDesc,
     Tensor<T> out_knhw(make_TensorDescriptor(out_knhw_desc));
 
 #if 0
-    constexpr unsigned BPerBlock = 128;
-    constexpr unsigned KPerBlock = 4;
+    constexpr unsigned BPerBlock = 256;
+    constexpr unsigned KPerBlock = 1;
     constexpr unsigned CPerBlock = 1;
 
-    constexpr unsigned BPerThread = 4;
+    constexpr unsigned BPerThread = 8;
     constexpr unsigned KPerThread = 1;
     constexpr unsigned CPerThread = 1;
 
-    constexpr unsigned ThreadPerClusterRow    = 4;
-    constexpr unsigned ThreadPerClusterColumn = 16;
+    constexpr unsigned ThreadPerClusterRow    = 1;
+    constexpr unsigned ThreadPerClusterColumn = 4;
 
-    constexpr unsigned BlockSize = 128;
+    constexpr unsigned BlockSize = 32;
 #elif 1
     constexpr unsigned BPerBlock = 128;
     constexpr unsigned KPerBlock = 64;
     constexpr unsigned CPerBlock = 2;
 
-    constexpr unsigned BPerThread = 4;
-    constexpr unsigned KPerThread = 16;
+    constexpr unsigned BPerThread = 8;
+    constexpr unsigned KPerThread = 8;
     constexpr unsigned CPerThread = 1;
 
     constexpr unsigned ThreadPerClusterRow    = 4;
-    constexpr unsigned ThreadPerClusterColumn = 16;
+    constexpr unsigned ThreadPerClusterColumn = 4;
 
     constexpr unsigned BlockSize = 128;
 #endif
diff --git a/src/include/gemm.cuh b/src/include/gemm.cuh
index 760cc1ad4d..99ecc4b962 100644
--- a/src/include/gemm.cuh
+++ b/src/include/gemm.cuh
@@ -388,9 +388,9 @@ struct blockwise_gemm_block_a_block_b_thread_c
                 const unsigned thread_work_cluster_id =
                     thread_id - cluster_work_block_id * (MThreadPerCluster * NThreadPerCluster);
 
-                const unsigned m_cluster_work_block_id = cluster_work_block_id / NThreadPerCluster;
+                const unsigned m_cluster_work_block_id = cluster_work_block_id / NClusterWork;
                 const unsigned n_cluster_work_block_id =
-                    cluster_work_block_id - m_cluster_work_block_id * NThreadPerCluster;
+                    cluster_work_block_id - m_cluster_work_block_id * NClusterWork;
 
                 const unsigned m_thread_work_cluster_id =
                     thread_work_cluster_id / NThreadPerCluster;
@@ -401,12 +401,12 @@ struct blockwise_gemm_block_a_block_b_thread_c
                 if(get_block_1d_id() == 0)
                 {
                     printf("%u %u, \t"
-                         //"MClusterWork %u MThreadPerCluster %u NClusterWork %u NThreadPerCluster %u \t"
+                           "MClusterWork %u MThreadPerCluster %u NClusterWork %u NThreadPerCluster %u \t"
                            "m_cluster_work_block_id %u n_cluster_work_block_id %u \t"
                            "m_thread_work_cluster_id %u n_thread_work_cluster_id %u \t"
                             "\n",
                             get_block_1d_id(), get_thread_local_1d_id(),
-                          //MClusterWork, MThreadPerCluster, NClusterWork, NThreadPerCluster,
+                            MClusterWork, MThreadPerCluster, NClusterWork, NThreadPerCluster,
                             m_cluster_work_block_id, n_cluster_work_block_id,
                             m_thread_work_cluster_id, n_thread_work_cluster_id);
                 }
diff --git a/src/include/gridwise_implicit_gemm_convolution_2_cnhw_srck_knhw.cuh b/src/include/gridwise_implicit_gemm_convolution_2_cnhw_srck_knhw.cuh
index 5ab64ca96d..2a609f046a 100644
--- a/src/include/gridwise_implicit_gemm_convolution_2_cnhw_srck_knhw.cuh
+++ b/src/include/gridwise_implicit_gemm_convolution_2_cnhw_srck_knhw.cuh
@@ -239,10 +239,13 @@ gridwise_implicit_gemm_convolution_2_cnhw_srck_knhw(InGlobalDesc,
                        p_out_thread[out_kb_thread_desc.Get1dIndex(k, b)]);
             }
 #endif
-            if(k_data < K && n_data < N && h_data < Ho && w_data < Wo)
+            if(n_data < N && h_data < Ho && w_data < Wo)
             {
+#if 1
                 p_out_global[out_knhw_global_desc.Get1dIndex(k_data, n_data, h_data, w_data)] =
                     p_out_thread[out_kb_thread_desc.Get1dIndex(k, b)];
+#endif
+
 #if 0
                 if(get_block_1d_id() == 0)
                 {