Are you talking about the periphials connectors, for like the hard drives, and such? there are 2 types the 4 pin molex
And the sata power
most of your older standard hard drives and DVD drives use the molex while most newer models, use the SATA. Most brand PSUs, from thermaltake, antec, corsair, etc, have both, and if your using an older computer, its important to check how many of the molex connectors you need before ordering the PSU, but typically all major brands should offer at least some PSUs that have both.
As far as the motherboard power, with dell theres occasional years they did special power wire arrangements, but for the most part, they went standard. The only difference might be if they used a 20 pin or a 24 pin-and most PSUs have the option to do either, but not all-check to see if it does before ordering, under motherboard power it should say something along the lines of 20+4. If it is a 20 pin PSU connect on the motherboard you just plug in the 20 pin conenctor-if its a 24 pin, you connect the 20 pin connector plus the attached 4 pin connector.
Primary system: Motherboard: ASUS M4A89GTD PRO/USB3, Processor: AMD Phenom II x4 945, Memory: 16 gigs of Patriot G2 DDR3 1600, Video: AMD Sapphire Nitro R9 380, Storage: 1 WD 500 gig HD, 1 Hitachi 500 gig HD, and Power supply: Coolermaster 750 watt, OS: Windows 10 64 bit.
Media Center: Motherboard: Gigabyte mp61p-S3, Processor: AMD Athlon 64 x2 6000+, Memory: 6 gigs Patriot DDR2 800, Video: Gigabyte GeForce GT730, Storage: 500 gig Hitachi, PSU: Seasonic M1211 620W full modular, OS: Windows 10.
If I don't reply within 24 hours of your reply, feel free to send me a pm.