diff --git a/lib/include/VX_config.h b/lib/include/VX_config.h
index e7a6b559..63be0e93 100644
--- a/lib/include/VX_config.h
+++ b/lib/include/VX_config.h
@@ -84,7 +84,7 @@
 #endif
 
 #ifndef NUM_CORES
-#define NUM_CORES 8
+#define NUM_CORES 4
 #endif
 
 #ifndef NUM_WARPS
diff --git a/lib/include/vx_spawn.h b/lib/include/vx_spawn.h
index 83052f30..db77e683 100644
--- a/lib/include/vx_spawn.h
+++ b/lib/include/vx_spawn.h
@@ -18,7 +18,7 @@
 #include <stdio.h>
 
 #ifndef CORES_PER_CLUSTER
-#define CORES_PER_CLUSTER 8
+#define CORES_PER_CLUSTER 4
 #endif
 
 #ifdef __cplusplus