Dell PowerVault ME4 vs ME5 vs ME52: Which Should You Buy?

Dell’s PowerVault ME5 and ME52 (2022 and 2025) sit alongside the ME4 (2018) as its successors, and at first glance it seems like nothing changed. The chassis, drive bays, drive-count limits, and power and heat figures are all the same.

What changed is everything between the drives, the host and the firmware: faster processors, more memory, higher-speed connectivity, new encryption and management options, and support for larger drives. The result is a significant generational step with no physical redesign.

By the numbers

What’s Identical

• Chassis sizes and drive bays (2U and 5U)
• Drive-count limits (2/264, 2/276, 28/336)
• Auto-tiering (up to 3 tiers)
• Thin provisioning (on by default)
• Maximum snapshots (1024)
• Power and thermal figures
• Number of expansion enclosures supported (up to 9x 2U or 3x 5U)
• All-inclusive software licensing

Note that ME4 drives are not supported in ME5 arrays or in expansion enclosures (JBODs) connected to ME5/ME52 controllers.

Expansion Enclosures: Similar, But Not Quite the Same

The original ME5 reuses the ME4 expansion enclosures: ME412, ME424 and ME484. The ME52 uses a new set: ME512, ME524, and ME584. All are 12Gb SAS, and the 2U shelves work only with 2U base arrays. If you’re planning to reuse existing shelves, the ME52 is incompatible with ME4/ME5 expansion enclosures.

What’s Different

Controller and Processing

The ME5 raises controller memory from 8GB to 16GB per controller (32GB across dual controllers). The processor moves from a 2-core 2.2GHz Intel Xeon Broadwell to a newer Intel Xeon chip with twice the cores. Dell doesn’t publish the exact core count, but the jump gives more headroom for data services, snapshots and replication. Virtual and linear pool size rises to 4PB per pool/controller.

The ME5012 and ME5024 come in single- or dual-controller configurations. The ME5084 is dual-controller only.

The ME52 goes further, with 24GB per controller (48GB across dual controllers) on the same Xeon processor and the same configurations as the ME5.

Connectivity

These are per-array maximums by controller module type, not combined totals.

The 32Gb FC and 25Gb iSCSI options let the ME5 saturate modern host adapters far more effectively. Migration still doesn’t force an immediate fabric upgrade, but plan around the limits. A 32Gb FC port won’t drop to 8Gb, so an 8Gb fabric needs a 16Gb-capable switch or older ports. A 10Gb BaseT iSCSI port will fall back only to 1Gb.

Drive Support and Capacity

The drive-count limits are identical, so the capacity gains come from larger media.

Max raw capacity by model:

ME52 figures are from Dell’s PowerVault page.

The math is straightforward: 336 drives × 18TB ≈ 6PB, versus 336 drives × 24TB ≈ 8.06PB. That’s roughly a 1.3× capacity improvement on the ME52 (about 1.1× on the ME5 with 20TB drives), driven by larger media rather than more drive slots. Dell positions the ME5/ME52 to handle 4x the capacity of ME4 once larger capacity drives come out, so expecting them to handle 72TB drives.

Encryption

Both generations offer self-encrypting drives, but the ME5 family widens the options.

• ME4: self-encrypting drives (SSD and HDD) with internal key management.
• ME5/ME52: AES-256 full-disk encryption, drives certified to FIPS 140-3 Level 2, internal key management, and external key managers over KMIP (IBM SKLM and Thales KeySecure at launch).

If you need external key management, this is a solid reason to move.

Software and Management

The ME5/ME52 uses PowerVault Manager (HTML5) and adds a Redfish/Swordfish REST API, a CLI API, OpenManage Enterprise and Dell AIOps (with ProSupport), plus the VMware vCenter plugin and SRM support.

Dell’s current ME52 spec sheet lists these host operating systems:

RAID and ADAPT

The ME5 offers RAID 1, 5, 6, 10 and ADAPT, and any combination of RAID levels can coexist in a single array. RAID 0 is available only for read cache (Dell vSphere best practices).

ADAPT is Dell’s distributed erasure-coding RAID. It shortens rebuild times, spreads spare capacity across all drives, and supports groups of up to 128 drives of mixed sizes. One planning requirement is that ADAPT needs at least 12 drives to start, and all of them must be the same type and in the same tier. A small array with a few SSDs and a few large HDDs can’t be a single ADAPT group.

Replication

Replication is cross-generation, which is a big deal for migrations. Dell lists asynchronous replication over FC or iSCSI from ME4 to ME5 Next Gen (ME52), from ME5 to ME4, and from ME5 Next Gen to ME5. An ME4 can only replicate to other ME4 arrays.

Backup Certification

The ME5212 is Veeam Ready Repository certified as a primary backup target (Veeam Backup & Replication 12), for both iSCSI and DAS. The certification dates to July 2025 and covers configurations with the same or more SSDs than the tested one. Dell’s ME52 spec sheet also lists Veeam v12.3 certification for the series.

Real-World Performance (StorageReview Benchmarks)

Dell rates the ME5 at up to 640K IOPS and the ME52 at up to 800K IOPS. The ME52 spec sheet lists 12GB/s read and 10GB/s write throughput.

StorageReview only tested an ME5012 hybrid configuration (2 SSDs plus HDDs) in both SAN (dual 32Gb FC) and direct-attached topologies:

A follow-up all-flash test showed much higher numbers:

These results line up with Dell’s headline specs, but only with a proper flash footprint. The hybrid configuration is respectable for entry-level use, while the all-flash build is where the ME5 stretches its legs. SAN and direct-attached results were nearly identical, which is good news for edge deployments that skip the fabric.

Why You Should Choose One Over the Other

Choose the ME52 if:

• You’re doing a new deployment. 32Gb FC, 25Gb iSCSI, 24GB controller memory, 24TB drives and up to 800K IOPS make it the right pick for modern workloads.
• You want capacity headroom toward 8PB.
• You want external key management (KMIP), FIPS 140-3 drives, Redfish/REST, OpenManage Enterprise or Dell AIOps.
• You need Veeam-certified backup storage (ME5212).
• You need replication to or from existing ME4 arrays during a migration.

Choose the ME5 if:

• You want the newer I/O and drive support but already own ME4xx expansion enclosures, because the ME5 reuses them.

The ME4 may still make sense if:

• Budget is tight and you don’t need faster connectivity or larger drives.
• You’re already invested in the ME4 ecosystem without a capacity or performance bottleneck.
• You have existing ME4 drives you want to reuse.

Moving from ME4? You keep the same 2U/5U form factors and the same power and heat figures. In today’s market, you get roughly 1.7× to 2× the capacity, much faster host connectivity and better management. Dell publishes a data-migration white paper, and cross-generation replication makes the move easier. It’s the same chassis with a better brain.