Last week, according to the table here in the forum, I ordered the Crucial P2 with 500GB and the Sintech Apdater. After installation, I was very disappointed with the measured write speed of just under 40-60MB. The read speed of just under 600MB was ok, but less than I had hoped.
The P2 shipped with firmware version P2CR031, so I wanted to update that first in hopes that this would bring a bit more speed. Unfortunately, I did not find a way to do this under macOS. All attempts via USB stick failed.
So I installed Windows 10 via Bootcamp, since Crucial offers its own software for updating the firmware. During the installation of Windows 10, there was always a blue screen at first, but with the tip on the first page to adjust the registry, the installation worked.
With Windows 10, I then installed the software "Crucial Storage Executive" and updated the firmware to the latest version P2CR033. The software also recommended enabling the "Momentum Cache". I did this as well.
After that, I restarted MacOS and checked the speed again with Blackmagic Disk Speed Test. Now I achieve a write speed of just under 1000 MB/s and a read speed of 1260 MB/s with the P2. First I wanted to sell the P2 again, but now everything fits. I would recommend anyone with such slow speeds to first update the firmware and activate the Momentum Cache. Everything now runs without problems under MacOS. No kernel panic and no other problems.
Here are some pictures for speed comparison:
Before with old SSD (First picture with 1GB, second with 5GB setting in Disk Speed Test):
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After with Crucial P2 (same settings for 1GB and 5GB):
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Under Windows 10, I unfortunately still have the problem that it comes more often to a blue screen when I boot the computer without power cord. Does anyone here have any idea why this happens?
Thanks for the great overview on the first page and the tips for the Bootcamp installation.