diff --git a/liteeth/phy/ku_1000basex.py b/liteeth/phy/ku_1000basex.py
index 142d913..e5034bb 100644
--- a/liteeth/phy/ku_1000basex.py
+++ b/liteeth/phy/ku_1000basex.py
@@ -357,7 +357,7 @@ class KU_1000BASEX(LiteXModule):
             p_RX_FABINT_USRCLK_FLOP        = 0b0,
             p_RX_INT_DATAWIDTH             = 0,
             p_RX_PMA_POWER_SAVE            = 0b0,
-            p_RX_PROGDIV_CFG               = 20.0,
+            p_RX_PROGDIV_CFG               = {1.25e9 : 20.0, 3.125e9 : 10.0}[self.linerate],
             p_RX_SAMPLE_PERIOD             = 0b111,
             p_RX_SIG_VALID_DLY             = 11,
             p_RX_SUM_DFETAPREP_EN          = 0b0,
@@ -456,7 +456,7 @@ class KU_1000BASEX(LiteXModule):
             p_TX_PMADATA_OPT             = 0b0,
             p_TX_PMA_POWER_SAVE          = 0b0,
             p_TX_PROGCLK_SEL             = "CPLL",
-            p_TX_PROGDIV_CFG             = 20.0,
+            p_TX_PROGDIV_CFG             = {1.25e9 : 20.0, 3.125e9 : 10.0}[self.linerate],
             p_TX_QPI_STATUS_EN           = 0b0,
             p_TX_RXDETECT_CFG            = 0b00000000110010,
             p_TX_RXDETECT_REF            = 0b100,
diff --git a/liteeth/phy/usp_gth_1000basex.py b/liteeth/phy/usp_gth_1000basex.py
index a443f64..6b51daf 100644
--- a/liteeth/phy/usp_gth_1000basex.py
+++ b/liteeth/phy/usp_gth_1000basex.py
@@ -401,7 +401,7 @@ class USP_GTH_1000BASEX(LiteXModule):
             p_RX_INT_DATAWIDTH             = 0,
             p_RX_PMA_POWER_SAVE            = 0b0,
             p_RX_PMA_RSV0                  = 0b0000000000000000,
-            p_RX_PROGDIV_CFG               = 20.0,
+            p_RX_PROGDIV_CFG               = {1.25e9 : 20.0, 3.125e9 : 10.0}[self.linerate],
             p_RX_PROGDIV_RATE              = 0b0000000000000001,
             p_RX_RESLOAD_CTRL              = 0b0000,
             p_RX_RESLOAD_OVRD              = 0b0,
@@ -514,7 +514,7 @@ class USP_GTH_1000BASEX(LiteXModule):
             p_TX_PMA_RSV0                  = 0b0000000000001000,
             p_TX_PREDRV_CTRL               = 2,
             p_TX_PROGCLK_SEL               = "PREPI",
-            p_TX_PROGDIV_CFG               = 20.0,
+            p_TX_PROGDIV_CFG               = {1.25e9 : 20.0, 3.125e9 : 10.0}[self.linerate],
             p_TX_PROGDIV_RATE              = 0b0000000000000001,
             p_TX_QPI_STATUS_EN             = 0b0,
             p_TX_RXDETECT_CFG              = 0b00000000110010,
diff --git a/liteeth/phy/usp_gty_1000basex.py b/liteeth/phy/usp_gty_1000basex.py
index c088691..342df11 100644
--- a/liteeth/phy/usp_gty_1000basex.py
+++ b/liteeth/phy/usp_gty_1000basex.py
@@ -419,7 +419,7 @@ class USP_GTY_1000BASEX(LiteXModule):
             p_RX_INT_DATAWIDTH             = 0,
             p_RX_PMA_POWER_SAVE            = 0b0,
             p_RX_PMA_RSV0                  = 0b0000000000101111,
-            p_RX_PROGDIV_CFG               = 20.0,
+            p_RX_PROGDIV_CFG               = {1.25e9 : 20.0, 3.125e9 : 10.0}[self.linerate],
             p_RX_PROGDIV_RATE              = 0b0000000000000001,
             p_RX_RESLOAD_CTRL              = 0b0000,
             p_RX_RESLOAD_OVRD              = 0b0,
@@ -531,7 +531,7 @@ class USP_GTY_1000BASEX(LiteXModule):
             p_TX_PMA_RSV0                  = 0b0000000000000000,
             p_TX_PMA_RSV1                  = 0b0000000000000000,
             p_TX_PROGCLK_SEL               = "CPLL",
-            p_TX_PROGDIV_CFG               = 20.0,
+            p_TX_PROGDIV_CFG               = {1.25e9 : 20.0, 3.125e9 : 10.0}[self.linerate],
             p_TX_PROGDIV_RATE              = 0b0000000000000001,
             p_TX_RXDETECT_CFG              = 0b00000000110010,
             p_TX_RXDETECT_REF              = 5,