diff --git a/x11/cuda_x11_simd512.cu b/x11/cuda_x11_simd512.cu
index fb63c15..1a9272b 100644
--- a/x11/cuda_x11_simd512.cu
+++ b/x11/cuda_x11_simd512.cu
@@ -673,10 +673,10 @@ void x11_simd512_cpu_hash_64(int thr_id, int threads, uint32_t startNounce, uint
 	dim3 grid((threads + threadsperblock-1) / threadsperblock);
 
 	dim3 grid8(((threads + threadsperblock - 1) / threadsperblock) * 8);
-
 	x11_simd512_gpu_expand_64 <<<grid8, block>>> (threads, startNounce, (uint64_t*)d_hash, d_nonceVector, d_temp4[thr_id]);
+
 	if (device_sm[device_map[thr_id]] >= 500) {
-		x11_simd512_gpu_compress_64_maxwell <<< grid8, block >>> (threads, startNounce, (uint64_t*)d_hash, d_nonceVector, d_temp4[thr_id], d_state[thr_id]);
+		x11_simd512_gpu_compress_64_maxwell <<< grid, block >>> (threads, startNounce, (uint64_t*)d_hash, d_nonceVector, d_temp4[thr_id], d_state[thr_id]);
 	} else {
 		x11_simd512_gpu_compress1_64 <<< grid, block >>> (threads, startNounce, (uint64_t*)d_hash, d_nonceVector, d_temp4[thr_id], d_state[thr_id]);
 		x11_simd512_gpu_compress2_64 <<< grid, block >>> (threads, startNounce, (uint64_t*)d_hash, d_nonceVector, d_temp4[thr_id], d_state[thr_id]);