Question G.Skill...but what type?

User Name Noob

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May 1, 2019
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I want to upgrade/expand my RAM to 32 GB...I have an Intel i7-6700K running @ 4 GHz., in an ASRock Z170 Extreme6 mobo. I went to the Intel site and it says that my processor will support DDR4-1866/2133 memory types. The ASRock website, on the other hand, says that my mobo will support much faster DDR4 memory modules. So, which G.Skill memory modules should I buy...4x8 DDR4 2133? Or can I go to 2x16 DDR4 3000? Thanks in advance!