The PEXSAT34RH 4-Port PCI Express 2.0 SATA Controller Card with HyperDuo adds 4 AHCI SATA III ports to a computer through a PCIe slot (x2), delivering multiple internal 6Gbps connections for high-performance hard drives and Solid State Drives (SSDs).
Featuring HyperDuo technology, the SATA card offers SSD auto-tiering which lets you balance the performance advantages of SSD storage with the cost-effectiveness and large capacity of standard hard drives. By combining SSD and HDD drives into a single volume (up to 3 SSD + 1 HDD), HyperDuo discreetly works in the background to identify and move frequently accessed files to the faster SSD drive(s) for improved data throughput - up to 80% of SSD performance! (Note: The HyperDuo automatic storage tiering feature is compatible with computers that use a BIOS.)
The PCIe SATA controller card supports Port Multiplier (PM), enabling multiple SATA drives to be connected to one port over a single cable, for a total of 7 drives (Up to 4 drives through PM on one port, and a single drive to the remaining 3 ports). Plus, the SATA controller card offers an effective hardware RAID solution, with native RAID (0, 1, 1+0) support.

Throughput Benchmark
Drive configuration Throughput Drive size
1 x HDD112.81 MB/s2 TB
1 x SSD490.28 MB/S120 GB
1 x HDD + 1 x SSD HyperDuo (Safe Mode)489.28 MB/s2 TB
1 x HDD + 2 x SSD HyperDuo (Safe Mode)715.13 MB/s2 TB
Drives Used:
SSD: OCZ Vertex 3 Series 2.5"" 120 GB (VTX3-25SAT3-120G)
HDD: Western Digital Caviar Green 3.5"" 2 TB (WD20EARS)

Software Used:
IO Meter, 256KB Sequential Read, queue depth = 10

This PCIe SATA 6gbps card is backed by a 2-year StarTech.com warranty and free lifetime technical support.