Branded desktop came with on site warranty but they use really cheap parts.
If u want something extra for your desktop, go to SLS and customize your own PC ( try not to buy their standard DIY pc in list too ) select your own parts and customize the PC yourself.
DIY will be cheaper than branded PC and you get better hardware ( CPU, MB, PSU )
and don't go to SLS Ah Neh shops to buy PC ( they will chop you like 菜头 )