Hey guys

I was thinking of getting a SSD for my XPS 8700 and this is my current spec of the machine-

1. Core i7 Processor(unchanged)
2. 16 GB DDR3L RAM(2x8)
3. NVIDIA ASUS STRIX 960 GTX
4. 1x 1TB HD and 1x3TB HD
5. 460w PSU(that came with the desktop)

I've read that you can have up to four hard drives so there should be space, so I was wondering if I add an SSD will the power supply be enough or do you think I'm pushing it a bit? And would I need any special cables other than a SATA cable? Also SSD size seems to be 2.5 Inch which I assume would fit? 

Cheers