Swapping GTX 1070 FTW2 8GB with an RX570 4GB?

Title says it all, and I'm hoping for some confirmation. My current set up is

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i7-7700k CPU

GTX 1070 FTW 2 8GB

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I currently have the option to swap my GPU for an Asus Strix RX 570 4GB OC.

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Reason for swap:

1. I'm honestly not too happy with the NVidia Hackintosh performance
2. I can buy the new card for $120 and sell the current card for $250, so...
3. I can't upgrade to Mojave with an NVidia card (I think)

My concerns are:

1. The overall performance of the 4GB card (I don't game, except for occasional League)
2. Any conflict between the Intel CPU and the RX570 card?
3. What is Hackintosh support for the RX570? I think I've read it's natively supported in Mojave, which sounds appealing.

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Happy to hear anybody's two-cents...