diff --git a/driver/conv.cu b/driver/conv.cu
index 82d711e447..25c42ec611 100644
--- a/driver/conv.cu
+++ b/driver/conv.cu
@@ -361,7 +361,7 @@ int main()
     constexpr unsigned K  = 1;
     constexpr unsigned S  = 3;
     constexpr unsigned R  = 3;
-#elif 1
+#elif 0
     // 3x3, 34x34
     constexpr unsigned N = 64;
     constexpr unsigned C = 256;
@@ -370,15 +370,6 @@ int main()
     constexpr unsigned K = 64;
     constexpr unsigned S = 3;
     constexpr unsigned R = 3;
-#elif 0
-    // 3x3, 54x54
-    constexpr unsigned N  = 64;
-    constexpr unsigned C  = 64;
-    constexpr unsigned HI = 54;
-    constexpr unsigned WI = 54;
-    constexpr unsigned K  = 64;
-    constexpr unsigned S  = 3;
-    constexpr unsigned R  = 3;
 #elif 0
     // 3x3, 56x56
     constexpr unsigned N  = 64;
@@ -415,6 +406,15 @@ int main()
     constexpr unsigned K  = 64;
     constexpr unsigned S  = 7;
     constexpr unsigned R  = 7;
+#elif 1
+    // 3x3, 58x58
+    constexpr unsigned N  = 16;
+    constexpr unsigned C  = 128;
+    constexpr unsigned HI = 58;
+    constexpr unsigned WI = 58;
+    constexpr unsigned K  = 256;
+    constexpr unsigned S  = 3;
+    constexpr unsigned R  = 3;
 #endif
 
     auto in_nchw_desc  = make_ConstantTensorDescriptor(Sequence<N, C, HI, WI>{});
@@ -449,7 +449,7 @@ int main()
     device_direct_convolution_2
 #elif 0
     device_implicit_gemm_convolution_1_nchw_kcsr
-#elif 1
+#elif 0
     device_implicit_gemm_convolution_1_nchw_srck_nkhw
 #elif 1
     device_implicit_gemm_convolution_1_chwn_csrk_khwn
diff --git a/driver/device_implicit_gemm_convolution_1_chwn_csrk_khwn.cuh b/driver/device_implicit_gemm_convolution_1_chwn_csrk_khwn.cuh
index 0dd5309255..c8996f1ad7 100644
--- a/driver/device_implicit_gemm_convolution_1_chwn_csrk_khwn.cuh
+++ b/driver/device_implicit_gemm_convolution_1_chwn_csrk_khwn.cuh
@@ -87,8 +87,8 @@ void device_implicit_gemm_convolution_1_chwn_csrk_khwn(InDesc,
     constexpr unsigned WoPerThread = 1;
 
     constexpr unsigned BlockSize = 8;
-#elif 1
-    // for 3x3, 34x34 | 3x3 58x58
+#elif 0
+    // for 3x3, 34x34 | 3x3 58x58, NKC = 64, 64, 256
     constexpr unsigned NPerBlock  = 16;
     constexpr unsigned KPerBlock  = 64;
     constexpr unsigned CPerBlock  = 4;
@@ -101,6 +101,21 @@ void device_implicit_gemm_convolution_1_chwn_csrk_khwn(InDesc,
     constexpr unsigned HoPerThread = 1;
     constexpr unsigned WoPerThread = 1;
 
+    constexpr unsigned BlockSize = 128;
+#elif 1
+    // 3x3 58x58, NKC = 16,256,128
+    constexpr unsigned NPerBlock  = 8;
+    constexpr unsigned KPerBlock  = 64;
+    constexpr unsigned CPerBlock  = 2;
+    constexpr unsigned HoPerBlock = 4;
+    constexpr unsigned WoPerBlock = 4;
+
+    constexpr unsigned NPerThread  = 4;
+    constexpr unsigned KPerThread  = 16;
+    constexpr unsigned CPerThread  = 1;
+    constexpr unsigned HoPerThread = 1;
+    constexpr unsigned WoPerThread = 1;
+
     constexpr unsigned BlockSize = 128;
 #elif 0
     // for 5x5, 36x36
diff --git a/driver/device_implicit_gemm_convolution_1_nchw_srck_nkhw.cuh b/driver/device_implicit_gemm_convolution_1_nchw_srck_nkhw.cuh
index f948f5205e..f6f9ccdbc1 100644
--- a/driver/device_implicit_gemm_convolution_1_nchw_srck_nkhw.cuh
+++ b/driver/device_implicit_gemm_convolution_1_nchw_srck_nkhw.cuh
@@ -65,7 +65,7 @@ void device_implicit_gemm_convolution_1_nchw_srck_nkhw(InDesc,
     constexpr unsigned WoPerThread = 2;
 
     constexpr unsigned BlockSize = 16;
-#elif 1
+#elif 0
     // for 3x3, 34x34
     constexpr unsigned NPerBlock  = 1;
     constexpr unsigned KPerBlock  = 64;
@@ -73,6 +73,7 @@ void device_implicit_gemm_convolution_1_nchw_srck_nkhw(InDesc,
     constexpr unsigned HoPerBlock = 4;
     constexpr unsigned WoPerBlock = 32;
 
+    constexpr unsigned NPerThread  = 1;
     constexpr unsigned KPerThread  = 16;
     constexpr unsigned CPerThread  = 1;
     constexpr unsigned HoPerThread = 2;
@@ -80,16 +81,32 @@ void device_implicit_gemm_convolution_1_nchw_srck_nkhw(InDesc,
 
     constexpr unsigned BlockSize = 128;
 #elif 0
-    // for 3x3, 34x34
-    constexpr unsigned NPerBlock  = 2;
+    // for 3x3, 58x58
+    constexpr unsigned NPerBlock  = 4;
     constexpr unsigned KPerBlock  = 64;
     constexpr unsigned CPerBlock  = 2;
-    constexpr unsigned HoPerBlock = 2;
-    constexpr unsigned WoPerBlock = 32;
+    constexpr unsigned HoPerBlock = 4;
+    constexpr unsigned WoPerBlock = 8;
 
+    constexpr unsigned NPerThread  = 4;
     constexpr unsigned KPerThread  = 16;
     constexpr unsigned CPerThread  = 1;
-    constexpr unsigned HoPerThread = 2;
+    constexpr unsigned HoPerThread = 1;
+    constexpr unsigned WoPerThread = 1;
+
+    constexpr unsigned BlockSize = 128;
+#elif 1
+    // for 3x3, 56x56
+    constexpr unsigned NPerBlock  = 32;
+    constexpr unsigned KPerBlock  = 64;
+    constexpr unsigned CPerBlock  = 4;
+    constexpr unsigned HoPerBlock = 2;
+    constexpr unsigned WoPerBlock = 2;
+
+    constexpr unsigned NPerThread  = 4;
+    constexpr unsigned KPerThread  = 16;
+    constexpr unsigned CPerThread  = 1;
+    constexpr unsigned HoPerThread = 1;
     constexpr unsigned WoPerThread = 1;
 
     constexpr unsigned BlockSize = 128;
@@ -123,6 +140,7 @@ void device_implicit_gemm_convolution_1_nchw_srck_nkhw(InDesc,
                                                             CPerBlock,
                                                             HoPerBlock,
                                                             WoPerBlock,
+                                                            NPerThread,
                                                             KPerThread,
                                                             CPerThread,
                                                             HoPerThread,
diff --git a/src/include/gridwise_implicit_gemm_convolution_1_nchw_srck_nkhw.cuh b/src/include/gridwise_implicit_gemm_convolution_1_nchw_srck_nkhw.cuh
index e0a416ebf2..a5aa0feaa4 100644
--- a/src/include/gridwise_implicit_gemm_convolution_1_nchw_srck_nkhw.cuh
+++ b/src/include/gridwise_implicit_gemm_convolution_1_nchw_srck_nkhw.cuh
@@ -17,6 +17,7 @@ template <unsigned GridSize,
           unsigned CPerBlock,
           unsigned HoPerBlock,
           unsigned WoPerBlock,
+          unsigned NPerThread,
           unsigned KPerThread,
           unsigned CPerThread,
           unsigned HoPerThread,
@@ -32,7 +33,9 @@ gridwise_implicit_gemm_convolution_1_nchw_srck_nkhw(InGlobalDesc,
     // NPerThread == NPerBlock, because the format of input in LDS [C,Hi,Wi,N]
     //   for GEMM trans([C,K]) * [C,Wo*N], we need a thread to do all the "N"
     // if we use [C,Hi,N,Wi,N] in LDS, then NPerThread can be different from NPerBlock
-    constexpr unsigned NPerThread = NPerBlock;
+    static_assert(NPerBlock % NPerThread == 0, "wrong! NPerBlock % NPerThread !=0");
+    static_assert((NPerThread < NPerBlock && WoPerThread == 1) || NPerThread == NPerBlock,
+                  "wrong!");
 
     constexpr auto I0 = Number<0>{};
     constexpr auto I1 = Number<1>{};
@@ -207,7 +210,9 @@ gridwise_implicit_gemm_convolution_1_nchw_srck_nkhw(InGlobalDesc,
 
     const unsigned ho_thread_data_begin = matrix_c_index.batch_begin;
     const unsigned k_thread_data_begin  = matrix_c_index.row_begin;
-    const unsigned wo_thread_data_begin = matrix_c_index.col_begin / NPerThread;
+    const unsigned wo_thread_data_begin = matrix_c_index.col_begin / NPerBlock;
+    const unsigned n_thread_data_begin =
+        matrix_c_index.col_begin - wo_thread_data_begin * NPerBlock;
 
     // output: register to global mem,
     //   convert out_thread[Ho,K,Wo,N] to out_global[N,K,Ho,Wo]
@@ -217,7 +222,7 @@ gridwise_implicit_gemm_convolution_1_nchw_srck_nkhw(InGlobalDesc,
         out_hkwn_thread_desc,
         p_out_thread,
         out_nkhw_global_desc,
-        p_out_global + out_nkhw_global_desc.Get1dIndex(n_block_data_begin,
+        p_out_global + out_nkhw_global_desc.Get1dIndex(n_block_data_begin + n_thread_data_begin,
                                                        k_block_data_begin + k_thread_data_begin,
                                                        ho_block_data_begin + ho_thread_data_begin,
                                                        wo_block_data_begin + wo_thread_data_begin),