New Computer - migrate arch linux from AMD to intel

For years my computer is used, it was found dead after 7 years of working of my AMD Computer. After recover from sadness, I bought new parts to fix it. As the original one was using DDR2 which is quite outdated, I bought a new (not means fast) CPU and mainboard.

Let see the migration spec:
Original Config:
AMD Athlon II X2 240e
J&W Nvidia Geforce 8200 Mainboard
2GB x4 DDR2 RAM
GPU: nvidia onboard

New Config:
Intel Pentium G3258
Asrock B85 Mainboard
8GB x1 DDR3 RAM
GPU: intel onboard

Software:
Arch Linux 3.18.6-ARCH 64bit

After connect everything, computer bootup as usual. It boot up successfully to console user login.

The following is not work:
1. X
2. network

For the network part as the interface index was changed, just amend the configuration on netctl, the dnsmasq (dhcp server and dns provider) and dhcp client and everything works great. Just a reminder that the service of original setting was still running, and these services should be stopped.

For X windows, as I original was using the open-source driver xf86, what I need to do is uninstall nouveau, remove all the configurations and install package "xf86-video-intel" from pacman and it works!!