RAID Controllers Price Comparison 2026
Compare 287 RAID controllers from HPE, Broadcom, Dell and more. Find the best price across top UK retailers, from entry-level SATA cards to enterprise SAS arrays.
RAID controllers sit at the heart of any serious server storage strategy — yet they're one of the most misunderstood components when it comes to procurement. Our analysis of 287 products across this category reveals a market dominated by HPE, which accounts for nearly two-thirds of the catalogue at a significantly higher average price than rivals like Broadcom or Dell. That gap isn't arbitrary: HPE's ecosystem lock-in is real, and it's worth understanding before you commit.
The price spread here is extraordinary. Entry points start from 41 £, covering basic SATA controllers suited to workstations or small NAS builds, whilst the top of the market stretches well beyond 819 £ for enterprise-grade SAS controllers with hardware encryption, battery-backed cache, and dual-core processors capable of managing 16 or more drives simultaneously. The median sits at 596 £, which broadly corresponds to a capable 8-port SAS 12Gbit/s controller — the sweet spot for most small-to-medium server deployments.
One pattern worth flagging: OEM-specific controllers from HPE, Dell, and Lenovo are often cheaper to source as spares, but they carry a significant compatibility caveat. Slot an HPE SmartArray into a non-HPE chassis and you may find the management interface simply refuses to cooperate. If you're building a mixed or white-box environment, vendor-agnostic options from Broadcom (formerly LSI) or interface cards from the broader adapter category are the safer bet.
PCIe generation matters more than many buyers realise. A PCIe 3.0 x8 slot caps bandwidth at around 8GB/s — fine for spinning SAS drives, but a genuine bottleneck if you're pairing the controller with modern NVMe SSDs. The shift to PCIe 4.0 in newer server platforms (think Gen11 HPE or current Lenovo ThinkSystem) doubles that ceiling. If your chassis supports it, paying the premium for a PCIe 4.0 controller is a decision you won't regret two years down the line.
For those managing regulated data — healthcare records, financial transactions — hardware AES-256 encryption and FIPS 140-2 compliance aren't optional extras. Several controllers in this catalogue, particularly from Microchip Technology's SmartRAID line and Broadcom's MegaRAID 9560 series, tick these boxes without requiring a separate encryption appliance. Pair your controller choice with the right RAID controller accessories — battery backup units and cable kits especially — to complete a resilient storage stack. And if you're evaluating the wider server build, our motherboard category covers the platform compatibility side in detail.
How to Choose a RAID Controller: The Key Criteria
With prices ranging from 41 £ to well over 819 £, picking the wrong RAID controller is an expensive mistake — and unlike a graphics card, you can't simply swap it out without risking data access. Here's what actually matters, in order of importance.
OEM-specific vs. vendor-agnostic: know before you buy
This is the single most important decision and it's rarely discussed upfront. Controllers from HPE (SmartArray), Dell (PERC/BOSS), and Lenovo are engineered for their own server ecosystems. They often integrate tightly with management tools like iLO or iDRAC, which is genuinely useful — but slot one into a different vendor's chassis and you may lose monitoring, alerting, or even basic functionality.
Broadcom MegaRAID and Intel VROC controllers are the go-to choices for mixed environments or custom builds. If you're not 100% certain your server fleet will stay single-vendor, lean towards vendor-agnostic. The price premium for OEM parts rarely justifies itself outside a managed HPE or Dell estate.
Drive interface: SAS, SATA, or NVMe — and why it's not interchangeable
SAS controllers (12Gbit/s is now standard; 24Gbit/s is emerging at the high end) support both SAS and SATA drives, making them the most flexible choice for mixed storage environments. SATA-only controllers are a legacy solution — fine for repurposing older hardware, but a dead end for new builds.
NVMe controllers are a different beast entirely. Products like the HPE NS204i-P are boot-device controllers designed specifically for NVMe SSDs over PCIe, not traditional spinning drives. Don't conflate the two. If you're building a high-performance all-flash array, you need an NVMe-capable controller; if you're managing a mix of HDDs and SSDs in a production server, a SAS 12Gbit/s controller is almost certainly the right call.
Port count and scalability
Eight-port controllers (8i) are the market standard and cover the majority of use cases — a 2U server with 8 drive bays is the most common configuration. Sixteen-port controllers (16i) make sense for dense storage servers or when you want a single controller managing a full JBOD expansion shelf.
Be realistic about growth. A controller that's maxed out at 8 drives on day one leaves no room for expansion without adding hardware. If your storage roadmap involves scaling beyond 8 drives within 18 months, the price difference between an 8i and a 16i is almost always worth it. Controllers like the Broadcom MegaRAID 9560-16i or Microchip SmartRAID 3258Up-32i/e exist precisely for this scenario.
Cache memory and battery backup (BBU)
Write cache dramatically improves performance — a controller with 1GB or 2GB of cache will handle burst write workloads far more gracefully than a cacheless design. But cache without battery backup (BBU) or a flash-backed write cache (FBWC) is a data integrity risk: a power cut mid-write can corrupt your array.
For any production workload, treat battery-backed or flash-backed cache as non-negotiable. Controllers in the 596 £ to 819 £ range typically include this; budget options below 356 £ often don't. Check the spec sheet carefully — "cache memory" and "battery-backed cache" are not the same thing.
PCIe generation: don't let your slot bottleneck your drives
PCIe 3.0 x8 provides roughly 8GB/s of bandwidth — adequate for SAS HDDs and most SATA SSDs, but a genuine constraint with high-speed NVMe drives. PCIe 4.0 x8 doubles that to 16GB/s. If your server platform supports PCIe 4.0 (most current-generation platforms do), there's little reason to choose a PCIe 3.0 controller for a new deployment.
Lane width matters too. An x8 controller in an x16 slot works fine; an x8 controller forced into an x4 slot will throttle performance. Always verify your server's available PCIe slots before purchasing — this is a common and avoidable mistake.
RAID levels and rebuild resilience
RAID 5 is the most common choice for capacity-efficiency, but it has a well-documented vulnerability window during rebuild — the longer the rebuild takes, the higher the risk of a second drive failure. RAID 6 (or RAID 60 for larger arrays) provides dual-drive fault tolerance and is strongly recommended for arrays larger than 4TB per drive.
Enterprise controllers support RAID 50 and RAID 60 for large-scale deployments, as well as proprietary variants like HPE's Advanced Data Guarding (ADG). For most SMB deployments, RAID 10 (mirroring + striping) remains the most reliable option when raw capacity isn't the priority. Confirm your chosen controller supports the RAID level you actually need — not all budget controllers support RAID 6.
- Entry-level and workstation use (From 41 £ to 356 £) : Basic SATA controllers (StarTech, Dawicontrol) and OEM boot-device cards. Suitable for workstations, home labs, or NAS builds where redundancy requirements are modest. Typically no battery-backed cache and limited RAID level support. Not recommended for production server environments.
- The sweet spot for SMB servers (From 356 £ to 596 £) : Where most capable 8-port SAS 12Gbit/s controllers live — including entry HPE SmartArray models and Intel VROC options. Expect PCIe 3.0, basic cache, and solid RAID 0/1/5/10 support. Good value for small business servers and departmental storage. Dell BOSS-S2 also falls here as a dedicated boot controller.
- Production-grade with full feature sets (From 596 £ to 819 £) : Broadcom MegaRAID 9560-8i, Microsemi SmartRAID, Adaptec, and mid-range Lenovo and Fujitsu OEM controllers. PCIe 4.0 support, hardware encryption, battery-backed cache, and RAID 6/60 capability. The right tier for most enterprise deployments and virtualisation hosts.
- High-density and mission-critical (Over 819 £) : HPE NS204i-u Gen11, Microchip SmartRAID 3258Up-32i/e, and Broadcom MegaRAID 9560-16i. Sixteen or more ports, PCIe 4.0 x16, 24Gbit/s SAS, and full encryption compliance. Designed for large-scale storage arrays, high-frequency transaction workloads, and environments where downtime is simply not an option.
Top products
- Broadcom MegaRAID SAS 9361-8i RAID controller PCI Express x8 3.0 12 Gbit/s (Broadcom) : The benchmark 8-port SAS 12Gbit/s controller for mixed environments — vendor-agnostic, well-documented, and broadly compatible. PCIe 3.0 limits its ceiling with NVMe, but for SAS/SATA arrays it remains a reliable workhorse. Strong choice if you're not locked into an OEM ecosystem.
- HPE SmartArray E208i-p SR Gen10 RAID controller PCI Express 3.0 12 Gbit/s (HPE) : HPE's entry-level SmartArray is the most affordable route into the HPE ecosystem and genuinely good value for HPE ProLiant servers. No cache by default — you'll need to add an FBWC module for write-intensive workloads, which adds to the total cost. Avoid if you're not running HPE hardware.
- Broadcom MegaRAID 9560-8i RAID controller PCI Express x8 4.0 12 Gbit/s (Broadcom) : The PCIe 4.0 upgrade to the 9361 — doubles the bandwidth ceiling and adds hardware AES-256 encryption. The right choice for current-generation server platforms where future-proofing matters. Noticeably pricier than the 9361, but the gap is justified for new deployments.
- HPE NS204I-P NVME PCIE3 OS BOOT DEVICE PL-SI RAID controller PCI Express (HPE) : A specialist NVMe boot controller, not a general-purpose RAID card — an important distinction. Excellent for mirrored OS boot volumes on HPE ProLiant Gen10 servers, freeing up drive bays for data storage. Useless outside HPE infrastructure, and overkill if you just need a standard SAS array.
- DELL BOSS-S2 RAID controller (DELL) : Dell's Boot Optimised Storage Solution — a dedicated M.2 RAID 1 controller for OS drives, not a general storage controller. Keeps your primary drive bays free for data and is a smart addition to any Dell PowerEdge build. Narrow use case, but it does that one job very well.
Related categories
Frequently Asked Questions
Can I use an HPE SmartArray controller in a non-HPE server?
Technically it will often initialise, but you'll lose most of the management functionality — HPE SmartArray controllers are designed to integrate with HPE's iLO management interface, and outside that ecosystem, monitoring, alerting, and firmware updates become unreliable or unavailable. For non-HPE servers, vendor-agnostic controllers from Broadcom (MegaRAID) or Intel (VROC) are the correct choice. The cost saving of buying a surplus HPE card rarely outweighs the operational headache.
What's the difference between a RAID controller and a simple SATA expansion card?
A RAID controller has a dedicated onboard processor and cache memory to manage RAID calculations in hardware, independently of the host CPU. A SATA expansion card simply adds ports — any RAID functionality relies entirely on the host CPU (software RAID), which adds overhead and is significantly less reliable for production use. For anything beyond a home lab or workstation, hardware RAID controllers are the correct solution. The performance and data integrity difference is substantial under load.
Is RAID 5 still safe to use in 2026?
RAID 5 remains viable for drives under 4TB, but becomes increasingly risky with larger drives due to the extended rebuild window — during which a second drive failure would cause total data loss. With modern high-capacity HDDs (8TB+), a RAID 5 rebuild can take 24–48 hours, creating an unacceptably long vulnerability window. RAID 6 or RAID 10 are the recommended alternatives for new deployments. If your controller supports RAID 60, that's the preferred choice for large arrays with six or more drives.
Do I need battery-backed cache on my RAID controller?
Yes, for any write-intensive or production workload. Without battery-backed cache (BBU) or flash-backed write cache (FBWC), a power interruption during a write operation can corrupt your RAID array — even if the drives themselves are fine. Controllers without BBU typically disable write caching by default, which significantly reduces write performance. If your budget only stretches to a controller without BBU, ensure your server has a UPS as a minimum safeguard.
What does '8i' or '16i' mean in a RAID controller model name?
The number indicates the port count and 'i' denotes internal connectors. An 8i controller supports up to 8 drives via internal SAS/SATA cables; a 16i supports up to 16. Some controllers also carry an 'e' suffix (for example, 32i/e), indicating external SAS ports for connecting JBOD expansion shelves. Always match the port count to your current drive count plus anticipated growth — upgrading a controller later means a full array migration.
Are cheap RAID controllers worth buying for a home server or NAS?
For a home lab or non-critical NAS, budget controllers from Dawicontrol or StarTech (available from 41 £) are perfectly adequate — particularly for RAID 1 mirroring or simple JBOD configurations. The risk comes if you use them for RAID 5/6 on important data: budget controllers often lack battery-backed cache and may have slower rebuild times, increasing exposure during drive failure. For anything holding irreplaceable data, spend more or use software RAID with a proper backup strategy instead.
What RAID controller accessories do I actually need?
At minimum: SAS/SATA cables (often not included), and a battery backup unit (BBU) or flash-backed write cache module if not bundled with the controller. For HPE SmartArray controllers, the Energy Pack or FBWC kit is sold separately and is essential for safe write caching. A low-profile bracket may also be required for 1U server installations. Check the full accessory list before purchasing — the controller price rarely tells the whole story.