diff --git a/libraries/Portenta_SDRAM/src/ram_internal.c b/libraries/Portenta_SDRAM/src/ram_internal.c
index e4deedd0c..a520a353f 100644
--- a/libraries/Portenta_SDRAM/src/ram_internal.c
+++ b/libraries/Portenta_SDRAM/src/ram_internal.c
@@ -38,29 +38,7 @@ static HAL_StatusTypeDef FMC_SDRAM_Clock_Config(void)
   RCC_PeriphCLKInitTypeDef  RCC_PeriphCLKInitStruct;
   
   RCC_PeriphCLKInitStruct.PeriphClockSelection = RCC_PERIPHCLK_FMC;
-  RCC_PeriphCLKInitStruct.FmcClockSelection = RCC_FMCCLKSOURCE_PLL2;
-#ifdef ARDUINO_GIGA
-  /* 16MHz HSE */
-  /* PLL2_VCO Input = HSE_VALUE/PLL2_M = (16/4) = 4 Mhz */
-  /* PLL2_VCO Output = PLL2_VCO Input * PLL_N = 4*100 = 400 Mhz */
-  /* FMC Kernel Clock = PLL2_VCO Output/PLL_R = 400/2 = 200 Mhz */
-  RCC_PeriphCLKInitStruct.PLL2.PLL2RGE = RCC_PLL2VCIRANGE_2;
-  RCC_PeriphCLKInitStruct.PLL2.PLL2M = 4;
-  RCC_PeriphCLKInitStruct.PLL2.PLL2N = 100;
-#else
-  /* 25MHz HSE */
-  /* PLL2_VCO Input = HSE_VALUE/PLL2_M = 25/5 = 5 Mhz */
-  /* PLL2_VCO Output = PLL2_VCO Input * PLL_N = 5*80  = 400 Mhz */
-  /* FMC Kernel Clock = PLL2_VCO Output/PLL_R = 400/2 = 200 Mhz */
-  RCC_PeriphCLKInitStruct.PLL2.PLL2RGE = RCC_PLL2VCIRANGE_2;
-  RCC_PeriphCLKInitStruct.PLL2.PLL2M = 5;
-  RCC_PeriphCLKInitStruct.PLL2.PLL2N = 80;
-#endif
-  RCC_PeriphCLKInitStruct.PLL2.PLL2FRACN = 0;
-  RCC_PeriphCLKInitStruct.PLL2.PLL2P = 2;
-  RCC_PeriphCLKInitStruct.PLL2.PLL2Q = 2;
-  RCC_PeriphCLKInitStruct.PLL2.PLL2R = 2;
-  RCC_PeriphCLKInitStruct.PLL2.PLL2VCOSEL = RCC_PLL2VCOWIDE;
+  RCC_PeriphCLKInitStruct.FmcClockSelection = RCC_FMCCLKSOURCE_HCLK;
   return HAL_RCCEx_PeriphCLKConfig(&RCC_PeriphCLKInitStruct);
 }
 
diff --git a/libraries/Portenta_SDRAM/src/ram_internal.h b/libraries/Portenta_SDRAM/src/ram_internal.h
index 1d6ff0721..5e3912e3c 100644
--- a/libraries/Portenta_SDRAM/src/ram_internal.h
+++ b/libraries/Portenta_SDRAM/src/ram_internal.h
@@ -14,7 +14,13 @@ bool sdram_init(void);
 #define MICROPY_HW_SDRAM_TIMING_TRP         (3)
 #define MICROPY_HW_SDRAM_TIMING_TRCD        (3)
 #define MICROPY_HW_SDRAM_REFRESH_RATE       (64) // ms
+
+#ifdef ARDUINO_GIGA
+#define MICROPY_HW_SDRAM_FREQUENCY          (120000) // 100 MHz
+#else
 #define MICROPY_HW_SDRAM_FREQUENCY          (100000) // 100 MHz
+#endif
+
 #define MICROPY_HW_SDRAM_REFRESH_CYCLES     4096
 
 #define MICROPY_HW_SDRAM_BURST_LENGTH       1