Reddit mentions of StarTech.com 6in LP4 to 8 Pin PCI Express Video Card Power Cable Adapter - lp4 to PCI express - molex to 8 pin PCIe (LP4PCIEX8ADP)

The 8 pin connector is likely an 8 pin EPS connector for the PSU. Unfortunately, your PSU is a low quality unit (as most are that come with a case) and does not appear to have the correct connections to power your GPU. You could buy an adapter like this but this is not ideal. The less cheap but more reliable option would be to buy a higher quality/wattage PSU with enough native connectors such as a Corsair CX500 and similar bronze rated units.

Not ideal at all. Depending on how much power the GPU is drawing, this could damage the PSU. It looks like his PSU isn't decent enough, since it doesn't even have a 8 pin PCIE cable, so I recommend buying a new PSU, if possible. If not possible, this should a better alternative, since it comes with some GPUs:
https://www.amazon.com/StarTech-com-LP4PCIEX8ADP-6-Inch-Express-Adapter/dp/B006PHXLRG
Edit: still not ideal, but it should be safer indeed

You can get name brand 500watt powersupplies routinely on slickdeals for $25 after a mail in rebate if that helps.

Also, Unless your current PSU is terrible, there's a decent chance you can use something like this to power it. Or 6 pin power if you choose a 6 pin power card.
https://www.amazon.com/StarTech-com-LP4PCIEX8ADP-6-Inch-Express-Adapter/dp/B006PHXLRG/ref=sr_1_2?s=pc&ie=UTF8&qid=1483482746&sr=1-2&keywords=8+pin+power+adapter

Oh, so I checked, it has 4 pcies, but 2 of them are 2x4 and 2 of them are 2x3. I need 2x4, and both of them are old pins. I bought this and it just came. Could it work? Its a new pin so it might work... https://www.amazon.co.uk/gp/aw/d/B006PHXLRG/ref=ya_aw_od_pi?ie=UTF8&psc=1

Hi again, just a quick question would one of these not work http://www.amazon.co.uk/Startech-Express-Video-Power-Adapter/dp/B006PHXLRG/ref=sr_1_2?ie=UTF8&qid=1372856705&sr=8-2&keywords=8+pin+pcie

Just to troubleshoot the problem?

This will work (although I never recommend converters for the sake of quality and they can be inconsistent with performance) StarTech.com LP4PCIEX8ADP 6-Inch LP4 to 8 Pin PCI Express Video Card Power Cable Adapter https://www.amazon.com/dp/B006PHXLRG/ref=cm_sw_r_awd_5LCLub0VJAXYM

Ok good, and does your Power Supply connector look like the one on the left or the right in this picture? If it looks like the one on the right, then you just need to snap them together and insert it into your RX 480. If it looks like the one on the left then you need to get an adapter like this one or this one. And again, I don't know your Power Supply model but you should double check to make sure it can handle the RX 480 (should be 450w minimum, 500+ recommended)

There are adapters that either convert a 6 pin to 8 pin or a molex to 8 pin.

6 to 8

Molex to 8 pin

It says I'd get it in July..

Is this a good alternative?

You could try this. Assuming your power supply will handle everything.

You can use a 6 to 8 pin PCIe adaptor. The 2 extra pins are just sense pins and can be just connected ground.

They also make 4 pin molex to 8 PCIe adaptors, but I've cooked one of those before, so they make me leery. The 4 pin molexes frequently make poor/loose connections as well.

It look like your RX 470 can pull around 160 W tops, so you should be careful your 450W PSU can power everything. Unless you got a bunch of extra crap, you'll probably be fine(a bit risky).

Will using a LP4 to 8 Pin PCI Express Video Card Power Cable Adapter affect preformance(https://www.amazon.co.uk/StarTech-com-Express-Video-Power-Adapter/dp/B006PHXLRG/ref=pd_lpo_vtph_147_bs_t_1?_encoding=UTF8&psc=1&refRID=FPDV18DSCM4WFAEG3X6E) on a 1070 ti. Thanks

You'll need to either get a new power supply or one of these.

Let me get this straight, your GPU requires 8 pin connector, right? And your PSU only has 6? If so, that means if the GPU requires more power and the PSU cant deliver, the GPU won't perform optimally or might even crash.

Something like this should work to fully power your GPU

I can't use something like this?