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Julian Cross
5
P542D delivered strong throughput with cache.
759557-B21
HPE SMART ARRAY P542D/2GB CONTROLLER
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759557-B21
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- HPE SMART ARRAY P542D/2GB CONTROLLER
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759557-B21 Overview
759557-B21-HPE SMART ARRAY P542D/2GB CONTROLLER is a high-performance storage controller designed as an expansion card that plugs into a PCIe slot – specifically a PCIe x8 interface supporting the PCIe 3.0 generation – and is built around the HPE Smart Array P542 chipset. As a dedicated RAID controller, it delivers hardware RAID functionality with a 2GB cache and is optimized for storage expansion in server environments.
Engineered for demanding data center applications, the 759557-B21-HPE SMART ARRAY P542D/2GB CONTROLLER offers broad operating system compatibility with Windows, Linux, VMware ESXi, and FreeBSD. Featuring a low-profile bracket design (with full height bracket support available as required) and passive cooling, this controller is ideally suited for efficient storage expansion and enhanced server performance.
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759557-B21 Specifications
- Product Type
- Expansion Card
- Card Type
- Storage Controller
- Interface
- PCIe x8
- PCIe Version
- PCIe 3.0
- Chipset / Controller
- HPE Smart Array P542
- Supported Ports
- N/A
- Port Count
- N/A
- Max Data Rate
- N/A
- RAID Levels Supported
- RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 / RAID 50 / RAID 60
- Capture Resolution
- N/A
- Capture Frame Rate
- N/A
- Low Profile Bracket
- Yes
- Full Height Bracket
- Yes
- Cooling
- Passive
- Operating System Compatibility
- Windows / Linux / VMware ESXi / FreeBSD
- Bus Width
- 64-bit
- Power Requirements
- 3.3V
- Use Case
- Storage Expansion
- Product Name
- 759557-B21-HPE SMART ARRAY P542D/2GB CONTROLLER
- Height
- 1.73 inches
- Width
- 5.91 inches
- Depth
- 9.84 inches
- Weight
- 1.06 lbs
759557-B21 Use Case
High-Density Virtualization in Enterprise Data Centers
In a large financial institution deploying hundreds of VMware ESXi hosts on HPE ProLiant DL380 Gen10 servers, the 759557-B21 HPE Smart Array P542D/2GB Controller delivers line-rate NVMe and SAS performance with advanced RAID 1/10 support. By offloading I/O management and leveraging 2 GB of cache with Flash-Backed Write Cache (FBWC), it reduces VM latency by up to 40% and boosts consolidation ratios by 30%. The outcome: predictable virtual machine performance at scale, simplified storage administration, and 99.99% uptime for critical services.
Mission-Critical Transaction Processing for Financial Services
A global bank running Oracle RAC on HPE ProLiant DL360 Gen10 Plus servers implements the 759557-B21 HPE Smart Array P542D/2GB Controller to underpin high-availability OLTP databases. Utilizing hardware-accelerated RAID 10 and persistent cache ensures sub-millisecond response times under heavy write loads. This configuration increases transaction throughput by 2× and delivers continuous data integrity during power events. The result: enhanced customer experience, regulatory compliance, and zero data loss in financial transactions.
Accelerating AI/ML Data Pipelines in HPC Clusters
A research lab building an HPE ProLiant DL580 Gen10-based HPC cluster for deep learning leverages the 759557-B21 HPE Smart Array P542D/2GB Controller to orchestrate large-scale NVMe flash arrays and tiered SAS storage. With built-in RAID 5/6 for capacity efficiency and adaptive cache algorithms, data ingestion for model training is 3× faster versus software RAID. This reduces experiment turnaround from days to hours, maximizes GPU utilization, and shortens time-to-insight for AI workloads.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
 759557-B21 |  830824-B21 |  804228-B21 |  726821-B21 |  749975-B21 | |
|---|---|---|---|---|---|
| Product Type | Expansion Card | Expansion Card | Expansion Card | Expansion Card | Expansion Card |
| Card Type | Storage Controller | Storage Controller | Storage Controller | Storage Controller | Storage Controller |
| Interface | PCIe x8 | PCIe x8 | PCIe x8 | PCIe x8 | PCIe x8 |
| PCIe Version | PCIe 3.0 | PCIe 3.0 | PCIe 3.0 | N/A | PCIe 3.0 |
| Chipset / Controller | HPE Smart Array P542 | HPE Smart Array P408i-p SR | N/A | HP Smart Array P440 | HP Smart Array |
| Supported Ports | N/A | N/A | N/A | N/A | N/A |
| Port Count | N/A | N/A | 8 | 1 | N/A |
| Max Data Rate | N/A | N/A | N/A | N/A | 1Gbps |
| RAID Levels Supported | RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 / RAID 50 / RAID 60 | RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 / RAID 50 / RAID 60 | N/A | RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 | RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 / RAID 50 / RAID 60 / JBOD |
| Capture Resolution | N/A | N/A | N/A | N/A | N/A |
| Capture Frame Rate | N/A | N/A | N/A | N/A | N/A |
| Low Profile Bracket | Yes | Yes | Yes | Yes | Yes |
| Full Height Bracket | Yes | No | No | Yes | Yes |
| Cooling | Passive | Passive | Passive | Passive | Passive |
| Operating System Compatibility | Windows / Linux / VMware ESXi / FreeBSD | Windows / Linux / VMware ESXi | Windows / Linux / VMware ESXi / FreeBSD | Windows / Linux / VMware ESXi | Windows / Linux / VMware ESXi |
| Bus Width | 64-bit | 64-bit | 64-bit | 64-bit | 64-bit |
| Power Requirements | 3.3V | 3.3V | 3.3V | 3.3V | 3.3V |
| Use Case | Storage Expansion | Storage Expansion | Storage Expansion | Storage Expansion | Storage Expansion |
| Product Name | 759557-B21-HPE SMART ARRAY P542D/2GB CONTROLLER | 830824-B21-SMART ARRAY P408I-P SR GEN10 CTRLR PL=SI | 804228-B21-HPE ProLiant DL560 Gen9 SAS Expander Card | 726821-B21-HP SMART ARRAY P440/4GB FBWC 12GB 1PORT INT SAS CONTROLLER | 749975-B21-HP Smart Array P246br/1G FIO Controller |
| Height | 1.73 inches | 0.55 inches | N/A | 1.5 inches | N/A |
| Width | 5.91 inches | 3.3 inches | N/A | 4.7 inches | N/A |
| Depth | 9.84 inches | 7.9 inches | N/A | 7.9 inches | N/A |
| Weight | 1.06 lbs | 1.2 lbs | N/A | 1.2 lbs | N/A |
Reviews & Ratings
N
Noman Qadir
4
OEM card fit cleanly.
H
Hugo Martin
5
Stable performance under load.
B
Brian Walsh
3
Good for expanding storage.
K
Kamil Wrobel
4
Dependable controller.
Questions & Answers
What is the HPE Smart Array P542D/2GB Controller (SKU: 759557-B21)?
The HPE Smart Array P542D/2GB Controller is a high-performance, entry-level RAID controller designed to provide hardware-accelerated data protection and drive management for HPE ProLiant and Apollo servers.
Which RAID levels are supported by the P542D/2GB Controller?
The controller supports RAID levels 0, 1, 1+0, 5, 6 and 50, enabling flexible data protection and performance tuning for mixed workload environments.
What interface and bandwidth does the P542D/2GB use?
It uses a PCIe 3.0 x8 interface delivering up to 2 GB/s of bandwidth, ensuring low latency and high throughput for data-intensive applications.
How much cache memory is included?
The P542D/2GB Controller includes 2 GB of DDR4 cache with write-back and write-through modes to accelerate read/write operations and improve application performance.