Also, I recommend updating to the latest bootloader. Go to this post, and view the youztube video on why & how to do this.
Which is essentially,
Download the Raspberry Pi OS . Burn the image to a uSD card. Install to the RPi 5 and boot up.
In a terminal window.
sudo apt update
sudo apt -y upgrade
sudo rpi-update (this installs the latest boot loader.)
Scroll down to my next post, and it tells more about what the new bootloader has added.
Once you have EnOS installed, do this to check the speed of your setup.
sudo hdparm -T --direct /dev/nvme0n1
lsblk -f will display the device names. Use the device name, not the partition name.
By default for NVMe it is set for Gen 2.
NVME Gen 2 will be about 400 MB/Sec
NVME Gen 3 will be about 800 MB/Sec
To enable Gen 3
sudo nano /boot/config.txt
scroll to bottom under [All] add the following
dtparam=nvme
dtparam=pciex1_gen=3
Pudge