diff --git a/Makefile.system b/Makefile.system
index b1f9ba514..cb0cac3e0 100644
--- a/Makefile.system
+++ b/Makefile.system
@@ -324,14 +324,16 @@ ifeq ($(ARCH), x86)
 DYNAMIC_CORE = KATMAI COPPERMINE NORTHWOOD PRESCOTT BANIAS \
 	       CORE2 PENRYN DUNNINGTON NEHALEM ATHLON OPTERON OPTERON_SSE3 BARCELONA BOBCAT ATOM NANO
 ifneq ($(NO_AVX), 1)
-DYNAMIC_CORE += SANDYBRIDGE BULLDOZER PILEDRIVER
+DYNAMIC_CORE += SANDYBRIDGE 
+#BULLDOZER PILEDRIVER
 endif
 endif
 
 ifeq ($(ARCH), x86_64)
 DYNAMIC_CORE = PRESCOTT CORE2 PENRYN DUNNINGTON NEHALEM OPTERON OPTERON_SSE3 BARCELONA BOBCAT ATOM NANO
 ifneq ($(NO_AVX), 1)
-DYNAMIC_CORE += SANDYBRIDGE BULLDOZER PILEDRIVER
+DYNAMIC_CORE += SANDYBRIDGE 
+#BULLDOZER PILEDRIVER
 endif
 endif
 
diff --git a/cpuid.h b/cpuid.h
index 2cbbd4539..4311ce95e 100644
--- a/cpuid.h
+++ b/cpuid.h
@@ -105,8 +105,8 @@
 #define CORE_NANO	19
 #define CORE_SANDYBRIDGE 20
 #define CORE_BOBCAT     21
-#define CORE_BULLDOZER  22
-#define CORE_PILEDRIVER  23
+#define CORE_BULLDOZER CORE_BARCELONA
+#define CORE_PILEDRIVER CORE_BARCELONA
 #define CORE_HASWELL CORE_SANDYBRIDGE
 
 #define HAVE_SSE      (1 <<  0)
@@ -198,8 +198,8 @@ typedef struct {
 #define CPUTYPE_NANO			43
 #define CPUTYPE_SANDYBRIDGE             44
 #define CPUTYPE_BOBCAT                  45
-#define CPUTYPE_BULLDOZER               46
-#define CPUTYPE_PILEDRIVER              47
+#define CPUTYPE_BULLDOZER CPUTYPE_BARCELONA
+#define CPUTYPE_PILEDRIVER CPUTYPE_BARCELONA
 // this define is because BLAS doesn't have haswell specific optimizations yet
 #define CPUTYPE_HASWELL CPUTYPE_SANDYBRIDGE 
 
diff --git a/driver/others/dynamic.c b/driver/others/dynamic.c
index 197cc2b2d..bf60efb19 100644
--- a/driver/others/dynamic.c
+++ b/driver/others/dynamic.c
@@ -63,14 +63,16 @@ extern gotoblas_t  gotoblas_BARCELONA;
 extern gotoblas_t  gotoblas_BOBCAT;
 #ifndef NO_AVX
 extern gotoblas_t  gotoblas_SANDYBRIDGE;
-extern gotoblas_t  gotoblas_BULLDOZER;
-extern gotoblas_t  gotoblas_PILEDRIVER;
+//extern gotoblas_t  gotoblas_BULLDOZER;
+//extern gotoblas_t  gotoblas_PILEDRIVER;
 #else
 //Use NEHALEM kernels for sandy bridge
 #define gotoblas_SANDYBRIDGE gotoblas_NEHALEM
+#endif
+
 #define gotoblas_BULLDOZER gotoblas_BARCELONA
 #define gotoblas_PILEDRIVER gotoblas_BARCELONA
-#endif
+
 //Use sandy bridge kernels for haswell.
 #define gotoblas_HASWELL gotoblas_SANDYBRIDGE
 
diff --git a/getarch.c b/getarch.c
index 3ffda6244..ec9bb75a8 100644
--- a/getarch.c
+++ b/getarch.c
@@ -354,7 +354,7 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #define CORENAME  "OPTERON"
 #endif
 
-#if defined(FORCE_BARCELONA) || defined(FORCE_SHANGHAI) || defined(FORCE_ISTANBUL)
+#if defined(FORCE_BARCELONA) || defined(FORCE_SHANGHAI) || defined(FORCE_ISTANBUL) || defined (FORCE_PILEDRIVER) || defined (FORCE_BULLDOZER)
 #define FORCE
 #define FORCE_INTEL
 #define ARCHITECTURE    "X86"
@@ -384,7 +384,7 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #define CORENAME  "BOBCAT"
 #endif
 
-#if defined (FORCE_BULLDOZER)
+#if 0
 #define FORCE
 #define FORCE_INTEL
 #define ARCHITECTURE    "X86"
@@ -400,7 +400,7 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #define CORENAME  "BULLDOZER"
 #endif
 
-#if defined (FORCE_PILEDRIVER)
+#if 0 
 #define FORCE
 #define FORCE_INTEL
 #define ARCHITECTURE    "X86"