Question Does the CORSAIR CX450 ATX have a 6 pin?

Did you try going to google.com and typing in:
corsair cx450

I did, and the second result was a NewEgg page: https://www.newegg.com/corsair-cx-series-cx450-450w/p/N82E16817139201

If you then went there, scrolled down a bit, and clicked on Specifications, you would see that it has one, a 6+2 pin PCIe connector, which covers your needs.

That said, I am not sure if the CX series are really that good - though I'll let those with more knowledge chime in.

At 450W, I'd play it safe and go with this (the Amazon price puts it at only $6 more than the CX450), as it's a high quality unit with a longer warranty.
https://pcpartpicker.com/product/Qb...ified-semi-modular-atx-power-supply-ssr-450fm


EDIT: you can also get some of Seasonic's older S12III models with somewhat higher power ratings for less money, but they are older models.
https://pcpartpicker.com/products/power-supply/#m=71&A=450000000000,2000000000000&sort=price&page=1