SunFounder Pironman
dtparam=nvme
Note: Enumeration of PCIe devices behind a switch is not currently supported.
PCIe Gen 3.0
• The connection is certified for Gen 2.0 speeds (5 GT/sec), but you can force it to Gen 3.0 (10 GT/sec) if you add
the following lines to your /boot/firmware/config.txt.
# Force Gen 3.0 speeds
dtparam=pciex1_gen=3
Warning: The Raspberry Pi 5 is not certified for Gen 3.0 speeds, and connections to PCIe devices at these
speeds may be unstable.
• You should then reboot your Raspberry Pi for these settings to take effect.
sudo reboot
6.3.2 About the Model
M.2 SSDs, known for their compact size, come in various types mainly differentiated by their keying (notch design on
the connector) and the interface they use. Here are the primary types:
• M.2 SATA SSDs: These use the SATA interface, similar to 2.5-inch SATA SSDs but in the smaller M.2 form
factor. They are limited by the SATA III maximum speeds of around 600 MB/s. These SSDs are compatible
with M.2 slots keyed for B and M keys.
• M.2 NVMe SSDs: These SSDs use the NVMe protocol over PCIe lanes and are significantly faster than M.2
SATA SSDs. They are suitable for applications requiring high read/write speeds like gaming, video editing,
and data-intensive tasks. These SSDs typically require M-keyed slots. These drives utilize the PCIe (Peripheral
Component Interconnect Express) interface, with different versions like 3.0, 4.0, and 5.0. Each new version of
PCIe effectively doubles the data transfer speed of its predecessor. However, the Raspberry Pi 5 uses a PCIe 3.0
interface, capable of delivering transfer speeds up to 3,500 MB/s.
M.2 SSDs come in three key types: B key, M key, and B+M key. However, later on, the B+M key was introduced,
combining the functionalities of the B key and M key. As a result, it replaced the standalone B key. Please refer to the
image below.
6.3. Pi5 NVMe PIP 49
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