diff --git a/openair1/PHY/MODULATION/nr_modulation.c b/openair1/PHY/MODULATION/nr_modulation.c
index 3ce067fe14..cba5e4ba53 100644
--- a/openair1/PHY/MODULATION/nr_modulation.c
+++ b/openair1/PHY/MODULATION/nr_modulation.c
@@ -38,7 +38,7 @@ void nr_modulation(uint32_t *in,
   uint32_t bit_cnt;
   uint64_t x,x1,x2;
     
-#if defined(__AVX2__)
+#if 0//defined(__AVX2__)
   uint16_t *in_2bytes = (uint16_t*) in;
   __m256i *nr_mod_table256;
   __m256i *out256;
@@ -113,7 +113,9 @@ void nr_modulation(uint32_t *in,
       out32[i] = nr_mod_table32[in_bytes[i]];
     return;
 
-#if defined(__AVX2__)
+#if 0//defined(__AVX2__) 
+// disabling this as it is slower than SSE2 
+// (maybe because L1 cache could not hold the large table)
   case 2:
     nr_mod_table256 = (__m256i*) nr_qpsk_2byte_mod_table;
     out256 = (__m256i*) out;
diff --git a/openair1/PHY/NR_REFSIG/nr_gen_mod_table.c b/openair1/PHY/NR_REFSIG/nr_gen_mod_table.c
index f7ec99e8e8..286df21203 100644
--- a/openair1/PHY/NR_REFSIG/nr_gen_mod_table.c
+++ b/openair1/PHY/NR_REFSIG/nr_gen_mod_table.c
@@ -34,7 +34,7 @@ void nr_generate_modulation_table() {
 
 short nr_qpsk_mod_table[8] = {16384,16384,-16384,16384,16384,-16384,-16384,-16384};
 
-#if defined(__AVX2__)
+#if 0//defined(__AVX2__)
   //QPSK m256
   table = (short*) nr_qpsk_2byte_mod_table;
   for (i=0; i<65536; i++) {
diff --git a/openair1/PHY/NR_REFSIG/nr_mod_table.h b/openair1/PHY/NR_REFSIG/nr_mod_table.h
index 4722ad7b7a..659d63c8d0 100644
--- a/openair1/PHY/NR_REFSIG/nr_mod_table.h
+++ b/openair1/PHY/NR_REFSIG/nr_mod_table.h
@@ -31,7 +31,7 @@
 
 short nr_qpsk_mod_table[8];
 
-#if defined(__AVX2__)
+#if 0//defined(__AVX2__)
 __m256i nr_qpsk_2byte_mod_table[65536];
 #elif defined(__SSE2__)
 __m128i nr_qpsk_byte_mod_table[2048];