Memory Types Supported by CPU List DDR4-2133/2400 but People Install 4000Mhz RAM With It. What am I missing?

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Ciysco

Commendable
Jan 30, 2017
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0
1,520
Hi guys, I've come across some confusing specs about memory.

Over on Intel's page for the i7 7700k specifications, under "Memory Specifications" it says: "Memory Types: DDR4-2133/2400 ...", (link) but I've seen people install RAM sticks of 4000Mhz+ along with this CPU.

So what am I missing? The new Kaby Lake has got to support those high speeds.. right? Are memory types not related to frequencies? Or will the RAM with higher frequencies not be completely utilised/work at slower clock speeds?

I'm sure the explanation is straightforward as it is with many things about tech, and I hope someone can help clarify this for me.

Thanks!
 
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SgtScream

Splendid
Dec 8, 2016
8,536
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Here's an example:
Your mother board natively supports ddr4 2133, meaning there's no configuration necessary. However, if your purchase xmp compatible 3000mhz ddr4 memory and you go into the bios, enabling xmp, your motherboard's memory controller is then overclocked to run at 3000mhz. In short, the memory controller can support higher than native speeds, however in order to achieve this, you have to enable xmp or you'll be running your very expensive3000mhz DDR4 memory dims at native speeds.
 
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