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Cache drive. Solution to my headache?

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So my system is an i3-8100 with 8gb ram. 

2x4 Tb data

1x2 Tb data

1x4TB parity 


Running dockers with 







I get problem with IOWAIT when files are unpacking and moving around. 


Watching movies at the same time is unbearable. 


So I figured a nice ssd cache drive would help out. (or will my cpu still get stalled by IOWAIT?) 


I have a M.2 slot PCIe Gen3 x4


So was thinking about this drive



So my questions

1. Will a cache disk help with my IOWAIT? 

2. Is this a good choice of drive? 

3. Is 512gb enough as cache? 

4. Is a better choice additional 8gb ram instead? 

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