Photoshop requires a lot of RAM. Cos when your pictures are huge, and I mean huge like > 1 GB, your system will completely lock up... so 8 GB RAM or more is better. 4 GB is the bare minimum to run Win 8.1, so you're not getting much left over for Photoshop. My preference is 16 GB and an SSD. You don't need a very powerful graphics card nor a super powerful CPU. Any Core series processor or even Core M processor or Celeron/Pentium or AMD is enough...