HPE
HPE 761874-B21 Smart Array P840 4GB FBWC 12Gb 2-port SAS Controller
A 12Gb/s SAS RAID controller with 4GB flash-backed cache and two internal ports for PCIe 3.0 x8 servers
- Electrical Outlet Plug TypeSAS Controller
- 4 GB cache accelerates RAID performance
- 12Gb/s SAS throughput handles heavy workloads
- PCI Express 3.0 x8 host interface maximises bandwidth
- Two internal SAS ports connect drive arrays
- WEEE certified for responsible disposal
HPE Smart Array P840 SAS Controller
The HPE Smart Array P840 is a 12Gb/s SAS controller designed for internal server storage. It connects via a PCI Express 3.0 x8 host interface and provides two internal SAS ports. The card includes 4 GB of flash-backed write cache to protect data during power loss. It suits administrators adding RAID capability to compatible HPE ProLiant servers.
12Gb/s SAS interface with two internal ports
The controller operates at 12Gb/s over two internal SAS ports and supports Serial ATA/600 drives. This port count and speed determine how many drives can be attached and the maximum throughput per drive. Systems needing more than two internal SAS connections or external port expansion will require a different controller or an additional HBA.
4 GB flash-backed write cache and RAID levels
The 4 GB FBWC module enables write-back caching across RAID 0, 1, 5, 6, 10, 50, 60, ADM and ADM10 configurations. It comfortably handles mixed read-write workloads on small to medium drive arrays. Performance may become constrained when scaling beyond the two internal ports or when cache-intensive workloads exceed the 4 GB buffer capacity.
Highlights
- 4 GB cache accelerates RAID performance
- 12Gb/s SAS throughput handles heavy workloads
- PCI Express 3.0 x8 host interface maximises bandwidth
- Two internal SAS ports connect drive arrays
- WEEE certified for responsible disposal
Specifications
| Brand | HPE |
|---|---|
| Electrical Outlet Plug Type | SAS Controller |
| Shipping weight | 0.91 kg |
| Package size | 203 × 152 × 51 mm |
Questions about this item
What does the 12Gb/s SAS speed mean once the card is installed?
The controller runs at up to 12Gb/s per SAS lane, so each attached drive can transfer at that rate when the drive itself supports 12Gb/s SAS.
How does the PCI Express 3.0 x8 host interface limit real-world throughput?
The x8 lane Gen 3.0 link caps total bandwidth at roughly 8 GB/s, which is the ceiling for combined traffic from both internal SAS ports.
Will the 4.4 by 6.6 inch plug-in card fit in a standard low-profile slot?
The card measures 4.4 inches tall and 6.6 inches deep, so it needs a full-height PCIe slot; it will not fit a low-profile bracket.
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