Computer Won't Start With More Than Two Ram Sticks Installed

Just upgraded my CPU, GPU, and RAM. Installed BIOS 4.8 to run my Ryzen 7 2700X and now have the Radeon RX 580 and want to run my 32GB of DDR4 2400MHz RAM. I have corsair vengeance lpx black 4x8GB that all came as part of the same package. My computer doesnt boot when i have more than two of the cards in my computer. i have tried all four sticks and all work at 2400mhz but when i use more than two sticks at a time the computer goes into an endless booting cycle. I have no idea what the problem is because i had previously used four sticks before the upgrade. I have the ASRock Killer SLI X370 mobo. Should i just switch to 2x16gb for my ram instead?
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  1. It might be the easiest option. See the mobo QVL: (Corsair filter applied)

    List of Corsair 8GB sticks that work with 4 slots.

    Type	RAM Speed	Size	Module				SS/DS	DIMM
    DDR4	Corsair	2933	8GB	CMR32GX4M4Z2933C16		SS	2/4
    DDR4	Corsair	2933	8GB	CMK32GX4M4Z2933C16		SS	2/4
    DDR4	Corsair	2666	8GB	CMD32GX4M4A2666C15 ver4.23	DS	2/4	
    DDR4	Corsair	2666	8GB	CMK32GX4M4A2666C16		DS	2/4	
    DDR4	Corsair	2666	8GB	CMK32GX4M4A2666C16 ver 5.30	SS	2/4

    Notice they're all 2666 or higher. Suggest you aim for DDR4-3000 or 3200, depending on budget. You'll be getting 11% / 22% / 33% faster RAM speed, depending on 2666 / 2933 / 3200, than you would get with 2400.

    For what it's worth, I went with the G.Skill Flare X CL14 (2x8GB kit). It ran at 3200 at advertised timings without any fuss.
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