is this 6Gbps or 3Gbps?

Google SATA III speed - it's 6 6Gb/s

is the card backwards compatible with pci-e 2 slots?

If the slot is a perfect match, most likely yes. The computer I'm using it in only has one x16 graphics slot and three x1 PCIe slots and it works fine. The limiting factor for me is the speed of the external SATA HDD drives.

Team Group T-FORCE VULCAN Z 2.5" 1TB SATA III 3D NAND Internal Solid State Drive (SSD) T253TZ001T0C101

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Main image of I/O CREST 2 Port SATA III PCI-e 3.0 x1 Controller Card (Jmicro Chipset), Add Two SATA 3.0 Devices to Any PCIe Slot

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I/O CREST 2 Port SATA III PCI-e 3.0 x1 Controller Card (Jmicro Chipset), Add Two SATA 3.0 Devices to Any PCIe Slot

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2 x SATA 6.0Gb/s Internal Connectors

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i/orest2portstiiipi-e 3.0 x1ontrollerrd (jmiroipset), ddtost 3.0 deviestonpieslot

Model
Brand	SYBA
Model	SI-PEX40148

Details
Type	SATA III (6.0Gb/s)
Internal Connectors	2 x SATA 6.0Gb/s
Interface	PCI-Express 3.0 x1

Features
Features	Compatible with PCI express Base Specification Revision 3.1a Compliant with Serial ATA AHCI (advanced host controller interface) Specification Rev 1.0, Supports SATA 3.0 transfer rate up to 6Gbps. Maxium Sequencial Read / Write Speed 850 MB/s. Jmicron JMB582 Chipset, Port Multiplier FIS-based and Command-based switching supported.Hot plug and Hot swap SATA ports. Support Gen 1i, Gen 1x, Gen 2i, Gen 2m, Gen 2x, and Gen 3i. Compatible with Windows XP/7/8/10/MAC/NAS/Linux OS. No driver installation is required. Support install Windows OS from Win10 PE.

Package Contents
Package Contents	1 x PCIe SATA Card 1 x Low Profile Bracket 1 x SATA Cable 1 x Manual 1 x Driver CD

Additional Information
First Listed on Newegg	January 06, 2020

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I/O CREST 2 Port SATA III PCI-e 3.0 x1 Controller Card (Jmicro Chipset), Add Two SATA 3.0 Devices to Any PCIe Slot

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Best Sellers

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I/O CREST 2 Port SATA III PCI-e 3.0 x1 Controller Card (Jmicro Chipset), Add Two SATA 3.0 Devices to Any PCIe Slot

Learn more about the Syba SI-PEX40148

Customer Reviews of the Syba SI-PEX40148

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info