Photo editing you don't need that much horsepower, but you need:
- a very good screen with the most acurate colors, IPS screen is recommended. You can also have a so so screen, but add another external monitor with the best colors.
- big rams (16gb) if you need to edit huge photos with many layers. If not, then 8gb is enough.
- 4 cores minimum, dual cores are on its way out