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Low write speeds on OS SSD drive Samsung PM951

Running benchmarks on my new Alienware 17 and it looks like write speeds for the Samsung PM951 NVMe are very low. CrystalDiskMark shows good read speeds but write is 3X slower than the specs.

Laptop seem to be running latest drivers and bios up to day. The default controller was set to RAID and thats where I left it. 

Any ideas? Faulty drive?

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