NVME Boot BIOS Modding Guide for Z77 MSI MPower

Hello,
Thx for guide, I followed it and it works.
The only problem is the speed.
This is the result from CrystalDiskMark 6
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I tried in different port, I removed GPU, but it is the same…

This SSD I tried in my notebook and results are much better. I expected the same.
cdm1

Does PCI-E slots MPower Z77 have some limitation?
Or maybe my CPU? I have 2600K i7.