diff --git a/src/cuda/cuda.cpp b/src/cuda/cuda.cpp
index c2bbbcc..06e44d6 100644
--- a/src/cuda/cuda.cpp
+++ b/src/cuda/cuda.cpp
@@ -29,7 +29,7 @@ struct topology* get_topology_info(cudaDeviceProp prop) {
 
 int32_t guess_clock_multipilier(struct gpu_info* gpu, struct memory* mem) {
   // Guess clock multiplier
-  int32_t clk_mul = -1;
+  int32_t clk_mul = 1;
 
   int32_t clk8 = abs((mem->freq/8) - gpu->freq);
   int32_t clk4 = abs((mem->freq/4) - gpu->freq);
@@ -37,10 +37,10 @@ int32_t guess_clock_multipilier(struct gpu_info* gpu, struct memory* mem) {
   int32_t clk1 = abs((mem->freq/1) - gpu->freq);
 
   int32_t min = mem->freq;
-  if(min > clk8) { clk_mul = 8; min = clk8; }
-  if(min > clk4) { clk_mul = 4; min = clk4; }
-  if(min > clk2) { clk_mul = 2; min = clk2; }
-  if(min > clk1) { clk_mul = 1; min = clk1; }
+  if(clkm_possible_for_uarch(8, gpu->arch) && min > clk8) { clk_mul = 8; min = clk8; }
+  if(clkm_possible_for_uarch(4, gpu->arch) && min > clk4) { clk_mul = 4; min = clk4; }
+  if(clkm_possible_for_uarch(2, gpu->arch) && min > clk2) { clk_mul = 2; min = clk2; }
+  if(clkm_possible_for_uarch(1, gpu->arch) && min > clk1) { clk_mul = 1; min = clk1; }
 
   return clk_mul;
 }
diff --git a/src/cuda/uarch.cpp b/src/cuda/uarch.cpp
index dc99571..6a9f144 100644
--- a/src/cuda/uarch.cpp
+++ b/src/cuda/uarch.cpp
@@ -275,6 +275,20 @@ struct uarch* get_uarch_from_cuda(struct gpu_info* gpu) {
    else if (arch->uarch == arch_ && (clkm_ == CM_ANY || clkm == clkm_)) return memtype;
 #define CHECK_MEMTYPE_END else { printBug("guess_memtype_from_cmul_and_uarch: Found invalid combination: clkm=%d, uarch=%d", clkm, arch->uarch); return MEMTYPE_UNKNOWN; }
 
+bool clkm_possible_for_uarch(int clkm, struct uarch* arch) {
+  switch(arch->uarch) {
+    case UARCH_TESLA:   return false;
+    case UARCH_FERMI:   return clkm == 1 || clkm == 2;
+    case UARCH_KEPLER:  return clkm == 1 || clkm == 2;
+    case UARCH_MAXWELL: return clkm == 1 || clkm == 2;
+    case UARCH_PASCAL:  return clkm == 1 || clkm == 2 || clkm == 4;
+    case UARCH_VOLTA:   return clkm == 1;
+    case UARCH_TURING:  return clkm == 2 || clkm == 4;
+    case UARCH_AMPERE:  return clkm == 1 || clkm == 4 || clkm == 8;
+  }
+  return false;
+}
+
 MEMTYPE guess_memtype_from_cmul_and_uarch(int clkm, struct uarch* arch) {
   /*
    * +---------+------------------+
diff --git a/src/cuda/uarch.hpp b/src/cuda/uarch.hpp
index ad0446e..86355fe 100644
--- a/src/cuda/uarch.hpp
+++ b/src/cuda/uarch.hpp
@@ -6,6 +6,7 @@
 struct uarch;
 
 struct uarch* get_uarch_from_cuda(struct gpu_info* gpu);
+bool clkm_possible_for_uarch(int clkm, struct uarch* arch);
 MEMTYPE guess_memtype_from_cmul_and_uarch(int ddr, struct uarch* arch);
 char* get_str_uarch(struct uarch* arch);
 char* get_str_cc(struct uarch* arch);