diff --git a/devicemodel/samples/nuc/launch_uos.sh b/devicemodel/samples/nuc/launch_uos.sh
index ed0a53fe3..24502299f 100755
--- a/devicemodel/samples/nuc/launch_uos.sh
+++ b/devicemodel/samples/nuc/launch_uos.sh
@@ -25,7 +25,7 @@ fi
 logger_setting="--logger_setting console,level=4;kmsg,level=3"
 
 #for memsize setting
-mem_size=4096M
+mem_size=12288M
 
 systemctl stop gdm.patch gdm
 
diff --git a/hypervisor/arch/x86/Kconfig b/hypervisor/arch/x86/Kconfig
index fb2e927c7..90636c37d 100644
--- a/hypervisor/arch/x86/Kconfig
+++ b/hypervisor/arch/x86/Kconfig
@@ -221,7 +221,7 @@ config SOS_RAM_SIZE
 
  config UOS_RAM_SIZE
 	hex "Size of the User OS (UOS) RAM"
-	default 0x200000000
+	default 0x400000000
 	help
 	  A 64-bit integer indicating the size of the User OS RAM (MMIO not
 	  included). Now we assume each UOS uses same amount of RAM size.