DevLA

Hello, Model: Macbook Pro 15 Mid 2015 2.5GHz quad-core Intel Core i7 Turbo Boost up to 3.7GHz 16GB 1600MHz memory 512GB PCIe-based flash storage1 Intel Iris Pro Graphics AMD Radeon R9 M370X with 2GB GDDR5 memory I just bought a MSI Radeon R9 390 plus an Akitio Thunderbox 2 as well, and trying to figure out how to set it up. I bought both from Amazon and will be here sometime next week. This is the power supply I have bought: EVGA SuperNOVA 650 GS 80+ GOLD, 650W http://www.officedepot.com/a/products/814855/EVGA-SuperNOVA-750-G1-Power-Supply/?cm_mmc=affiliates-_-Computer_Parts_and_Upgrades-_-814855-{copy:IQ_PE} I am just trying to figure out where the barrel plug goes in all this. As in connector goes to the PSU and the back of the Akitio has a barrel hole that I stick the plug into and thats it? Also I am not good at soldering as I have zero experience in it so I was wondering where could I just buy one unless its idiot proof? Also I heard from another member I need a 24pin connector where could I get one of those? Or does my PSU that I bought already have it. I'm new to GPU building.