The ports on the PSU are just the ports on the PSU, those are not standardized on that end; you buy specific cables for specific PSUs because the pinouts are not the same on the PSU side from PSU to PSU. As JG told you, this PSU came with one PCIE cable with two PCIE connectors for GPUs. That's the only cable you install for PCIE and you only install it where the PSU tells you to.
Your description is a little confusing, but from what you've said, I have the impression that your brother doesn't have the foggiest clue what he's talking about and you should not listen to his advice at all in this manner.
Oof, OK Thank you guys so much! this kinda was a roadblock for me nice to see its gone.I will definitely be back with a update on the current situation.Im gonna go ahead and buy what he told me to get.
P.S : even though this is my first build i want you guys to know i have gotten everything i have in the build completely FREE or from my old Dell optiplex. Build below excluding hard drive
PCPartPicker Part List:
https://pcpartpicker.com/list/kTKs3t
CPU: AMD FX-6300 3.5 GHz 6-Core Processor
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($34.99 @ Newegg)
Storage: Kingston A400 240 GB 2.5" Solid State Drive ($31.99 @ Amazon)
Video Card: Gigabyte Radeon HD 7870 2 GB Video Card
Case: Corsair 200R ATX Mid Tower Case ($74.99 @ Newegg)
Power Supply: Corsair CX 500 W 80+ Bronze Certified Semi-modular ATX Power Supply ($219.98 @ Amazon)
Total: $361.95
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2020-07-02 02:50 EDT-0400