I would say that some people prefer having more of a 'storage' based system. Plus, some smaller ITX boards are coming in with M.2, but perhaps only two SATA ports. This would allow an ITX board to host 7 SATA drives (1 boot, 6 more in a ZFS array) while not needing a full ATX board.

if this is an X4 pcie lane stick. how can there be more then 4 sata connections?

It has a SATA controller built in, and uses the PCIe connections to make the connection to the rest of the system. So the SATA controller just appears to be just another 'add in card' as if you had plugged it into a regular PCIe slot. Also, it's a x2 connection, but if you're connecting regular spinny hard drives, you'll probably never saturate the link unless you have a ZFS array with 4-5 drives on it as a regular HDD might do 100-150MB/sec maximum data transfer.

Will this work on a PCIe Gen 2 host controller (an ARM SBC) or is the host required to have PCIe Gen 3?

The card has a 2-Lane M.2 PCI-Express 3.0 interface (B and M Key) and complies with PCI Express Base Specification Revision 3.1a.

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Syba 5 port Non-RAID SATA III 6Gbp/s to M.2 B+M Key Adapter PCI-e 3.0 x2 Bandwith

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5 x SATA 6.0Gb/s Internal Connectors

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Specs

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Using the JMB585 chipset, the SI-ADA40141 can provide M. 2 (PCIe Gen3 x2 bandwidth) to 5 Port SATA 6Gb / s card solution. For the storage solution based on data transfer of multiple hard drives, the newly added FIS-based switching design can overcome the bottlenecks created by operating multiple SATA storage devices simultaneously. The data transmission rate of the JMB585 can achieve to 1700MB/s, which is the maximum transfer speed of PCIe Gen3 x2.
Host Interface: PCI Express 3.0 x2Controller
Type: Serial
ATA/600RAID Supported: NoSATA
Connector Details:
5Height: 3.1W
idth: 0.4"F orm
Factor: Plug-in
CardPackage Contents: 5 Port SATA Controller to M. 2 Slot 5 x SATA Cables 1 x Manaul
Platform Supported: LinuxPlatform
Supported: PCEnvironmentally
Friendly: YesEnvironmental
Certification: WEEE
Limited Warranty: 3 YearPackage Contents 5 Port SATA Controller to M. 2 Slot 5 x SATA Cables 1 x Manaul "

Model
Brand	SYBA
Model	SI-ADA40141

Details
Type	SATA III (6.0Gb/s)
Internal Connectors	5 x SATA 6.0Gb/s
Interface	PCI-Express 3.0 x2

Features
Features	Connect five SATA drives to a M.2 B+M Key Connection, providing up to 1700 MB/s speed. Plug and play supported, no additional software installation or setting required. Can support Port Multiplier that is not in a RAID configuration. Compatible with SATA hard drives and solid state drives and computer systems with SATA controllers. 2-Lane M.2 PCI-Express 3.0 interface (B and M Key). Complies with PCI Express Base Specification Revision 3.1a. This card is only design for storage use only, can not boot any OS / System drives.

Package Contents
Package Contents	1 x 5 Port SATA Controller to M.2 Slot 5 x SATA Cables 1 x Manaul

Additional Information
First Listed on Newegg	July 21, 2025

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Syba 5 port Non-RAID SATA III 6Gbp/s to M.2 B+M Key Adapter PCI-e 3.0 x2 Bandwith

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