Question Don't know the name of a cable and want to buy a new power supply

[BananaMastr]

Okay, so I recently purchased an EVGA 400w power supply for my computer since mine is fairly old, and when trying to locate the different wires to replace with the new ones, I found a cable that the power supply didn't have yet is needed. It's labeled "P2" and I tried looking everywhere for a power supply with the same cable, but couldn't find one. Any help? Here's a picture of the cable:

https://imgur.com/a/R07SbwJ

View: https://imgur.com/a/R07SbwJ

 

[scout_03]

the old psu is it a dell system and they use proprietary psu and connector you need to check on the net for a atx to dell psu adaptor .