Is this compatible with Ryzen 7 1800X?

It should be but best way to know is to check the motherboard of the manufacture and see if compatible as not all memory is compatible with all motherboards.

What motherboard / cpu combination can use this right now ?

As of now the only motherboards that support this are the new X99 motherboards for the Intel Haswell-E line of CPUs, which are Socket 2011-3.

What is the Timing on this stick?

It's the standard CL15 timings... 15-15-15-39.

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Crucial 4GB DDR4 2133 (PC4 17000) Desktop Memory Model CT4G4DFS8213

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DDR4 2133 (PC4 17000)
CAS Latency CL15
Voltage 1.20V

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Crucial 4Gb (1X4Gb) Pc417000 Ddr42133Mhz Sddram Nonecc Unbuffered Cl15 Memory Module

Model
Brand	Crucial
Model	CT4G4DFS8213

Details
Capacity	4GB
Speed	DDR4 2133 (PC4 17000)
CAS Latency	CL15
Voltage	1.20V
ECC	No
Buffered/Registered	Unbuffered
Color	Green
Heat Spreader	No
Features	Increase data throughput - up to 50% more memory bandwidth Enable up to twice the installed server memory capacity Reduce power consumption - up to 40% more energy efficient Easier system cooling - less heat generated per module Optimized for future Intel Xeon processor E5-2600 v3 product family Compatible with OEM servers and warranties Backed by the Reliance Program
LED Color	None

Additional Information
First Listed on Newegg	June 18, 2024

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Crucial 4GB DDR4 2133 (PC4 17000) Desktop Memory Model CT4G4DFS8213

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Item#: 9SIAWKTK8Y1804

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Crucial 4GB DDR4 2133 (PC4 17000) Desktop Memory Model CT4G4DFS8213

Learn more about the Crucial CT4G4DFS8213

Customer Reviews of the Crucial CT4G4DFS8213

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Warranty, Returns, And Additional Information

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