diff --git a/src/mainboard/system76/cfl-h/Kconfig b/src/mainboard/system76/cfl-h/Kconfig
index 8bc1fee3f3..7130fd7fd9 100644
--- a/src/mainboard/system76/cfl-h/Kconfig
+++ b/src/mainboard/system76/cfl-h/Kconfig
@@ -67,7 +67,7 @@ config ONBOARD_VGA_IS_PRIMARY
 
 config MAX_CPUS
 	int
-	default 16
+	default 12
 
 config DIMM_MAX
 	int
diff --git a/src/mainboard/system76/cfl-h/devicetree.cb b/src/mainboard/system76/cfl-h/devicetree.cb
index 477ce51425..367519d3a4 100644
--- a/src/mainboard/system76/cfl-h/devicetree.cb
+++ b/src/mainboard/system76/cfl-h/devicetree.cb
@@ -125,6 +125,9 @@ chip soc/intel/cannonlake
 	register "PcieClkSrcUsage[11]" = "20"
 	register "PcieClkSrcClkReq[11]" = "11"
 
+	# PCI Express on CPU x8, Clock 8 (GPU)
+	register "PcieClkSrcClkReq[8]" = "8"
+
 	# Misc
 	register "Device4Enable" = "1"
 	register "HeciEnabled" = "1"