Upgrading to a 1070ti with a prebuilt's PSU?

Feb 4, 2019
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Hey guys

My components are the following

CPU: Intel Core i7 8700
GPU: Zotac GTX 1060 6gb
PSU: Liteon 500w
MB: Acer N50-600
Ram: 16gb DDR4

I want to upgrade my GPU to an Asus 1070ti Cerberus, but there are some problems I have

the Liteon PSU doesn't have an 8pin connector, or a 6+2 pin connector, only 2x6 pin connectors. This is enough for the 1060 with a 6pin connector, but the 1070ti has an 8 pin. Would I be fine just plugging a single 6pin connector into the 1070ti?

I've been reading around and found conflicting information. The 2 additional wires are only for grounding? The 6pin is only enough for 75w, until other people say it's not?

Can't provide a picture of the PSU with the volt rails, but I can jerryrig a graph:

3.3v/16A
5v/16A
12v1/12A
12v2/14A
12v3/18.5A
5v/2.5a
12v/8.3A