diff --git a/cmake/OptimalOptions.cmake b/cmake/OptimalOptions.cmake
index cde210d..0cca510 100644
--- a/cmake/OptimalOptions.cmake
+++ b/cmake/OptimalOptions.cmake
@@ -14,6 +14,11 @@ IF(CMAKE_COMPILER_IS_GNUCXX)
 		#SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=pentium4")
 	ENDIF(NV_SYSTEM_PROCESSOR STREQUAL "i686")
 
+	IF(NV_SYSTEM_PROCESSOR STREQUAL "x86_64")
+		SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=athlon64")
+		#SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=athlon64 -msse3")
+	ENDIF(NV_SYSTEM_PROCESSOR STREQUAL "x86_64")
+
 	IF(NV_SYSTEM_PROCESSOR STREQUAL "powerpc")
 		SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mcpu=powerpc -maltivec -mabi=altivec -mpowerpc-gfxopt")