diff --git a/src/mainboard/samsung/lumpy/devicetree.cb b/src/mainboard/samsung/lumpy/devicetree.cb
index 6bf571a..f73e6039 100644
--- a/src/mainboard/samsung/lumpy/devicetree.cb
+++ b/src/mainboard/samsung/lumpy/devicetree.cb
@@ -14,6 +14,8 @@
 	register "gpu_panel_power_backlight_on_delay" = "2100"	# T5: 210ms
 	register "gpu_panel_power_backlight_off_delay" = "2100"	# TD: 210ms
 
+	register "max_mem_clock_mhz" = "666"
+
 	device cpu_cluster 0 on
 		chip cpu/intel/socket_rPGA989
 			device lapic 0 on end