diff --git a/src/mainboard/google/poppy/variants/baseboard/devicetree.cb b/src/mainboard/google/poppy/variants/baseboard/devicetree.cb
index 89dc22a618..76ec693ebb 100644
--- a/src/mainboard/google/poppy/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/poppy/variants/baseboard/devicetree.cb
@@ -253,6 +253,7 @@ chip soc/intel/skylake
 	}"
 
 	register "speed_shift_enable" = "1"
+	register "psys_pmax" = "45"
 	# PL2 override 15W for KBL-Y
 	register "tdp_pl2_override" = "15"
 	register "tcc_offset" = "10"     # TCC of 90C
diff --git a/src/mainboard/google/poppy/variants/nautilus/devicetree.cb b/src/mainboard/google/poppy/variants/nautilus/devicetree.cb
index 9714766055..3c87b27cf3 100644
--- a/src/mainboard/google/poppy/variants/nautilus/devicetree.cb
+++ b/src/mainboard/google/poppy/variants/nautilus/devicetree.cb
@@ -270,6 +270,7 @@ chip soc/intel/skylake
 	}"
 
 	register "speed_shift_enable" = "1"
+	register "psys_pmax" = "45"
 	# PL2 override 15W for KBL-Y
 	register "tdp_pl2_override" = "15"
 	register "tcc_offset" = "10"     # TCC of 90C
diff --git a/src/mainboard/google/poppy/variants/soraka/devicetree.cb b/src/mainboard/google/poppy/variants/soraka/devicetree.cb
index 3bcda3cc10..65955eb7d9 100644
--- a/src/mainboard/google/poppy/variants/soraka/devicetree.cb
+++ b/src/mainboard/google/poppy/variants/soraka/devicetree.cb
@@ -250,6 +250,7 @@ chip soc/intel/skylake
 	}"
 
 	register "speed_shift_enable" = "1"
+	register "psys_pmax" = "45"
 	# PL2 override 15W for KBL-Y
 	register "tdp_pl2_override" = "15"
 	register "tcc_offset" = "10"     # TCC of 90C