ASR-5405 Adaptec PCIe x8 4-Port SAS RAID Controller - 256MB Cache

Our review of the ASR-5405 Adaptec PCIe x8 4-port SAS RAID controller finds it best suited for small server upgrades and workstation users who need reliable hardware RAID without complexity. The bottom line: this controller delivers straightforward RAID functionality and a dedicated 256MB cache to improve write performance on SATA/SAS arrays, making it a practical option when replacing or adding a discrete RAID card. It is a no-frills, hardware-focused solution for those who prioritize compatibility and predictable behavior over advanced modern features.

Key Features

• PCI Express x8 interface: Provides a wide host bus lane to support multiple drives with sustained throughput for typical server workloads.
• Four SAS ports: Allows connection of up to four direct-attached SAS or SATA drives for RAID configurations without external expanders.
• 256MB onboard cache: Improves write performance and helps smooth burst activity during rebuilds and random write operations.
• Hardware RAID support: Offloads RAID processing from the CPU to maintain host performance under sustained I/O.
• New bulk pack condition: Arrives as new in bulk packaging, suitable for system builders and IT shops stocking replacement parts.

Who It's For

The ASR-5405 is aimed at IT professionals, system integrators, and small business owners who need a dependable, entry-level hardware RAID controller for legacy or mid-life servers. It suits environments where simple RAID levels and predictable performance matter more than the latest caching algorithms or enterprise software suites.

Users who need cutting-edge features like multi-gigabit NVMe support, large battery-backed caches, or vendor-managed cloud integration should look elsewhere. Likewise, those needing extensive warranty-backed enterprise deployments may prefer a current-generation controller with advanced firmware and support options.

Pros & Cons

Pros

• Reliable hardware RAID offload that frees the host CPU for other tasks.
• Dedicated 256MB cache that helps improve write throughput and rebuild responsiveness.
• Four SAS ports give straightforward expandability for small arrays without external hardware.
• New bulk-pack condition is practical for budget-focused purchases and replacements.

Cons

• Limited to four ports and mid-level cache size, so it is not ideal for large arrays or high-density storage enclosures.
• Lacks modern NVMe support and advanced management features found on newer controllers.

Specifications

Product name	ASR-5405 Adaptec 4-Port SAS RAID Controller
Interface	PCI Express x8
Ports	4 SAS ports
Onboard cache	256MB
Form	Add-in card, internal I/O card
Packaging	New bulk pack

Our Verdict

The ASR-5405 is a solid, cost-conscious RAID controller for small servers and workstations that need dependable hardware RAID and a modest 256MB cache. It represents good value when upgrading or replacing a discrete controller on older platforms, but those seeking modern features or large-scale expansion should consider more recent models.

Frequently Asked Questions

Does this card support SATA drives?
Yes; the four SAS ports are compatible with SAS and SATA drives when connected directly.

Is the onboard 256MB cache battery-backed?
The specification notes a 256MB cache but does not indicate a battery backup; expect standard volatile cache behavior unless an external module is supplied.

Will it fit in any server?
It uses a PCIe x8 interface and fits in slots that accept x8 or x16 cards; verify physical clearance and slot availability before purchase.