--- a/libop/op_hw_specific.h
+++ b/libop/op_hw_specific.h
@@ -150,6 +150,9 @@
 		case 0x46:
 		case 0x47:
 			return CPU_HASWELL;
+		case 0x37:
+		case 0x4d:
+			return CPU_SILVERMONT;
 		}
 	}
 	return cpu_type;