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759557-B21
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- HPE SMART ARRAY P542D/2GB CONTROLLER
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3 Year Extended Warranty
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Our best-in-class warranties
3-Year Extended Warranty
Extended protection, enterprise-grade.
All enterprise hardware is backed by a 3-year warranty — triple the industry standard — covering defects under normal use.
Professional repairs & replacements.
If a hardware issue is confirmed, we’ll repair or replace the unit. Replacement parts carry either original or 3-month coverage.
RMA process, simplified.
Once an RMA is approved, return the defective unit within 10 days. We handle the rest — no service gaps.
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Your warranty covers defects under normal use. For continued protection, avoid accidental damage, unauthorized repairs, third-party parts, or extreme environments.
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In some regions, return-to-factory or remote service may apply. On-site service depends on infrastructure availability.
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Covered for any early faults.
All equipment includes a 30-day replacement warranty. If something goes wrong, we’ll repair or swap it — fast.
Replacements shipped in 10 days or less.
Once your return is inspected and approved, we dispatch the replacement promptly to keep your operations moving.
RMA protocol keeps it smooth.
Just ensure all accessories and original packaging are intact — we’ll take care of the technical validation.
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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.
What is the price of 759557-B21?
Pricing for 759557-B21 is available on request. Get immediate quote or for exclusive discounts, opt for bulk quotation for 759557-B21.
Explore more options from Server Expansion Cards or explore other Hpe products.
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
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| Bus Width | 64-bit | 64-bit | 64-bit | 64-bit | 64-bit |
| Capture Frame Rate | N/A | N/A | N/A | N/A | N/A |
| Capture Resolution | N/A | N/A | N/A | N/A | N/A |
| Card Type | Storage Controller | Storage Controller | Storage Controller | Storage Controller | Storage Controller |
| Chipset / Controller | HP Smart Array P440 | N/A | HPE Smart Array P408i-p SR | HP Smart Array | HPE Smart Array P542 |
| Cooling | Passive | Passive | Passive | Passive | Passive |
| Depth | 7.9 inches | N/A | 7.9 inches | N/A | 9.84 inches |
| Full Height Bracket | Yes | No | No | Yes | Yes |
| Height | 1.5 inches | N/A | 0.55 inches | N/A | 1.73 inches |
| Interface | PCIe x8 | PCIe x8 | PCIe x8 | PCIe x8 | PCIe x8 |
| Low Profile Bracket | Yes | Yes | Yes | Yes | Yes |
| Max Data Rate | N/A | N/A | N/A | 1Gbps | N/A |
| Operating System Compatibility | Windows / Linux / VMware ESXi | Windows / Linux / VMware ESXi / FreeBSD | Windows / Linux / VMware ESXi | Windows / Linux / VMware ESXi | Windows / Linux / VMware ESXi / FreeBSD |
| PCIe Version | N/A | PCIe 3.0 | PCIe 3.0 | PCIe 3.0 | PCIe 3.0 |
| Port Count | 1 | 8 | N/A | N/A | N/A |
| Power Requirements | 3.3V | 3.3V | 3.3V | 3.3V | 3.3V |
| Product Name | 726821-B21-HP SMART ARRAY P440/4GB FBWC 12GB 1PORT INT SAS CONTROLLER | 804228-B21-HPE ProLiant DL560 Gen9 SAS Expander Card | 830824-B21-SMART ARRAY P408I-P SR GEN10 CTRLR PL=SI | 749975-B21-HP Smart Array P246br/1G FIO Controller | 759557-B21-HPE SMART ARRAY P542D/2GB CONTROLLER |
| Product Type | Expansion Card | Expansion Card | Expansion Card | Expansion Card | Expansion Card |
| RAID Levels Supported | RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 | N/A | 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 / JBOD | RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 / RAID 50 / RAID 60 |
| Supported Ports | N/A | N/A | N/A | N/A | N/A |
| Use Case | Storage Expansion | Storage Expansion | Storage Expansion | Storage Expansion | Storage Expansion |
| Weight | 1.2 lbs | N/A | 1.2 lbs | N/A | 1.06 lbs |
| Width | 4.7 inches | N/A | 3.3 inches | N/A | 5.91 inches |
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Questions & Answers
Q
What is the HPE Smart Array P542D/2GB Controller (SKU: 759557-B21)?
A
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.
Q
Which RAID levels are supported by the P542D/2GB Controller?
A
The controller supports RAID levels 0, 1, 1+0, 5, 6 and 50, enabling flexible data protection and performance tuning for mixed workload environments.
Q
What interface and bandwidth does the P542D/2GB use?
A
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.
Q
How much cache memory is included?
A
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.
Q
Which drive types can I connect to this controller?
A
You can connect SAS, SATA, and nearline SAS drives up to 12 Gbps; with support for both HDD and SSD form factors, it adapts to performance or capacity needs.
Q
Is the P542D/2GB compatible with HPE ProLiant and Apollo servers?
A
Yes, it is fully supported in the HPE ProLiant DL and ML series as well as Apollo storage servers when paired with the correct drive cages and backplanes.
Q
What operating systems are supported by this controller?
A
It officially supports Microsoft Windows Server, various Linux distributions (RHEL, SLES, Ubuntu), VMware ESXi, and VMware vSphere for broad deployment flexibility.
Q
Does the controller support NVMe drives?
A
No, the P542D/2GB Controller is designed for SAS and SATA only; NVMe support requires HPE NVMe-enabled Smart Array or NVMe HBAs.
Q
How does the P542D/2GB Controller improve data protection?
A
By offloading parity calculations to dedicated hardware and offering battery-backed cache, it ensures rapid rebuilds and data integrity during power events.
Q
Can I expand storage capacity with this controller?
A
Yes, you can connect up to eight ports per controller and daisy-chain drive enclosures to scale capacity into the petabyte range.
Q
What firmware version is required for optimal performance?
A
HPE recommends installing Firmware Version 8.40 or later, which includes performance enhancements, interoperability updates, and security patches.
Q
How is the P542D/2GB Controller installed?
A
Installation is a tool-free process: insert the controller into a free PCIe x8 slot, secure the bracket, attach data cables, and power on the server to load firmware.
Q
What performance gains can I expect?
A
With hardware RAID acceleration and 2 GB cache, you can see up to 50% reduction in disk I/O latency and throughput improvements of up to 75% over software RAID.
Q
What warranty and support options are available?
A
HPE offers a three-year limited warranty with optional ProLiant Care Pack services for 24x7 support, rapid parts replacement, and proactive health checks.
Q
Where can I purchase the HPE Smart Array P542D/2GB Controller?
A
You can buy it through authorized HPE resellers, the HPE online store, and major IT distributors; check for availability and volume pricing on HPE’s official website.
