Reddit reviews SilverStone Black Sleeved PSU Cable for One PCI-E 8pin (6+2) PP06B-2PCIE55

Something like this:

PCI-E 8 pin

The cable you got is the extension cable. You need something like this SilverStone Black Sleeved PSU Cable for One PCI-E 8pin (6+2) PP06B-2PCIE55 https://www.amazon.com/dp/B00A45JA52/ref=cm_sw_r_cp_api_i_vmhZCbGM95T6N

http://www.amazon.com/gp/aw/d/B00A45JA52/ref=mp_s_a_1_2?qid=1420843033&sr=8-2

Hello all,
I've recently purchased a new graphics card and subsequently realized I needed an 8 pin PCI-E cable to connect it. My power supply says it has 8 pin but now with all parts in hand it seems like the connectors are keyed differently. I feel like I'm missing something but can't figure out for the life of me. Specs below. Any assistance would help put my mind at ease.

PSU: https://www.newegg.com/Product/Product.aspx?Item=N82E16817341017R

GPU: https://pcpartpicker.com/product/7wkwrH/msi-radeon-rx-470-4gb-armor-oc-video-card-radeon-rx-470-armor-4g-oc

Connector I currently have: https://www.amazon.com/gp/product/B00A45JA52/ref=od_aui_detailpages00?ie=UTF8&psc=1

Again, any push in the right direction would help.

I'm using one PCI-E 8 pin that came with the PSU but since it only came with one 8 pin I had to order a different one and this is the only one I could find.
https://www.amazon.com/gp/product/B00A45JA52/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

I think it might be this cables fault since it was made for a silverstone PSU

Here's one.

This is the 1 for GPUs: https://www.amazon.com/Silverstone-Sleeved-ATX12V-750mm-PP06B-EPS75/dp/B00A45JA52/ref=sr_1_1?ie=UTF8&qid=1496261866&sr=8-1&keywords=8%2Bpin%2Bto%2B8%2Bpin%2B750mm&th=1

I have a CX500M which according to pcpartpicker is compatible. Could I use the 6+2 PCI-E part and plug into my GPU? What kind of cord would I need for that? Or do I need a new PSU altogether?

edit: This maybe?

it should work, but i really wouldn't use it. I would get this male 8-pin to male 8-pin and connect PSU directly to GPU with any splitters.

https://www.amazon.com/Silverstone-Tek-Sleeved-PCI-E-PP06B-PCIE55/dp/B00A45JA52/ref=pd_cp_pc_0

something like this. In this case it's called PCI-E cable, which doesn't really matter. EVGA just calls it VGA (Video Graphics Array), just their way of saying it's for graphic cards.

there SHOULDN'T be any compatibility issues, but if you are not sure, it's better to call up EVGA and ask if they can send you one (It seems you have a modular PSU, but i guess you just don't have all the cables for it?)

http://www.amazon.com/Silverstone-Tek-Sleeved-PCI-E-PP06B-PCIE55/dp/B00A45JA52/ref=pd_cp_pc_0?tag=viglink20237-20

http://www.moddiy.com/categories/Cables/PSU-Cables/

So one like this? You should be able to find one pretty cheap online.

EDIT: You could also use one of these to convert molex into a 6 pin connector