SK Hynix 32GB PC4-17000P-R DDR4-2133 vs SK Hynix HMA84GR7MFR4N-UH 32GB DDR4-2400 (2026): Key Differences
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You are comparing sk hynix hynix 32gb pc4 17000p r ddr4 2133 vs hynix hma84gr7mfr4n uh. Both modules offer 32GB of capacity and include ECC support for data integrity. They share the same brand heritage. The main difference lies in their speed and specific server optimization. One runs at 2133MHz while the other reaches 2400MHz. This affects how quickly data moves in your system.
Key differences
| Aspect | SK Hynix 32GB DDR4-2133 RDIMM | SK Hynix 32GB DDR4-2400 ECC REG |
|---|---|---|
| Memory Speed | 2133 MHz | 2400 MHz |
| Form Factor | RDIMM | ECC REG DIMM |
| Compatible Device | not listed | Server |
| Model Number | HMA84GL7MMR4N-TF | HMA84GR7MFR4N-UH |
Which one should you choose?
Choose SK Hynix 32GB DDR4-2133 RDIMM if
- You need a module with a lower 2133 MHz speed rating.
- Your system specifically requires the RDIMM form factor.
Choose SK Hynix 32GB DDR4-2400 ECC REG if
- You require the higher 2400 MHz transfer rate.
- You are installing memory in a dedicated server environment.
Verdict: Choose the 2133MHz module if your platform is optimized for that specific speed or requires the RDIMM form factor. Select the 2400MHz option for faster data throughput in compatible server hardware. Both provide essential ECC protection for reliable operation.
Speed and Form Factor Comparison
Memory Speed
Product A is rated for DDR4-2133, which corresponds to the PC4-17000P specification. This base frequency is standard for many older server platforms. Product B offers a higher speed rating of DDR4-2400. This increase in clock speed allows for faster data transfer rates between the memory and the processor. For workloads that are sensitive to bandwidth, such as large database queries or real-time analytics, the 2400MHz module provides a tangible performance head start. You should verify if your specific motherboard supports the higher 2400MHz speed, as some older systems may downclock the module to 2133MHz or lower.
Form Factor
Both modules use registered DIMM formats designed for server environments. Product A is listed as an RDIMM. Product B is described as an ECC REG DIMM. Registered DIMMs include a register or buffer between the memory chips and the system bus. This buffer reduces the electrical load on the memory controller, allowing servers to support more memory modules than standard unbuffered DIMMs. This makes both options suitable for high-capacity server builds. The specific RDIMM designation in Product A confirms its registered nature, aligning it with the REG classification of Product B. Both will fit into compatible server slots.
Compatible Device
Product B explicitly lists Server as its compatible device. This confirms its intended use in enterprise hardware. Product A does not explicitly list the compatible device type in the provided attributes, though its RDIMM form factor strongly implies server or workstation use. RDIMMs are generally not compatible with standard consumer desktop motherboards. You must ensure your system supports registered memory. If your system is a standard PC, neither module will work. For server applications, Product B’s explicit labeling offers clarity, while Product A’s technical designation requires you to verify compatibility with your specific server model.
Physical Dimensions
Product A has specific weight and height measurements. It weighs 1.12 ounces and has a height of 1.21 inches. Product B provides length and width data. It is 6 inches long and 1 inch wide. The height of Product B is listed as 0.2 inches, which seems unusually low for a DIMM and may refer to a different dimension or be a data error. Product A’s height of 1.21 inches is standard for DIMM clearance. If you are installing these in tight server chassis, the standard height of Product A is safer. The length of 6 inches for Product B is also non-standard for typical DIMMs, suggesting potential data inconsistency. Always measure your slot clearance before purchasing.
ECC Support
Both modules include ECC support. Error Correcting Code memory detects and corrects single-bit memory errors. This is critical for server stability and data integrity. Product A lists ECC support in its attributes. Product B also lists ECC support in its attributes. This shared feature ensures that both modules can help prevent data corruption in critical applications. Neither module is a standard non-ECC DIMM. You must have a motherboard and processor that support ECC memory for this feature to function. If your system does not support ECC, these modules may not boot or may operate without error correction, depending on the platform.
Which Memory Kit Suits Your Server
Users needing higher bandwidth for newer platforms
Product B runs at DDR4-2400, offering faster data transfer rates than the 2133 MHz speed of Product A. This higher clock speed is ideal for modern server environments that require increased memory bandwidth to handle demanding workloads efficiently without bottlenecking performance.
Administrators optimizing for compact physical dimensions
Product A measures 0.16 inches in width, making it significantly thinner than the 1-inch width of Product B. This slim profile is advantageous for servers with tight clearance constraints or dense rack configurations where vertical space on the motherboard is limited.
Teams prioritizing established compatibility standards
Product A is labeled PC4-17000P, indicating a standardized speed rating often found in legacy systems. If your infrastructure relies on older server boards that natively support DDR4-2133, this module ensures stable operation and proven compatibility without requiring BIOS updates or adjustments.
The products compared
SK Hynix 32GB DDR4-2133 RDIMM
Best for: Server systems needing ECC stability
- Total Capacity
- 32GB
- Memory Speed
- 2133 MHz
- Module Configuration
- 1x32GB
- Form Factor
- U-DIMM
- ECC Support
- ECC RDIMM
- Dimensions
- 5.25 × 0.16 × 1.21 inches
View on Amazon: SK Hynix 32GB DDR4-2133 RDIMM Affiliate link
This SK Hynix module is a 32GB DDR4-2133 memory stick designed for servers. It features ECC support and an RDIMM form factor. The physical dimensions are 5.25 by 1.21 by 0.16 inches, and it weighs 1.12 ounces. You need this kit if your system requires registered memory with error correction for stable operation.
Pros
- 32GB capacity
- DDR4-2133 speed
- ECC support
- RDIMM form factor
Cons
- Lower 2133 MT/s speed compared to 2400 MT/s options
- Server-grade RDIMM, not compatible with standard desktops
- No mention of heat spreader for passive cooling
Good fit if
- You need ECC memory for server stability
- Your motherboard supports RDIMM modules
- You require 32GB capacity per stick
Skip if
- You are building a standard desktop PC
- You need higher than 2133 MT/s speeds
- Your system only supports UDIMM modules
Verdict: SK Hynix 32GB DDR4-2133 ECC RDIMM is a reliable server memory choice for systems requiring error correction. It suits users who prioritize stability over higher clock speeds.
SK Hynix 32GB DDR4-2400 ECC REG
Best for: Server systems needing ECC registered memory
- Total Capacity
- 32GB
- Memory Speed
- 2400MHz
- Form Factor
- DIMM
- ECC Support
- ECC REG
- Compatible Device
- Server
- Dimensions
- 6 × 1 × 0.2 inches
View on Amazon: SK Hynix 32GB DDR4-2400 ECC REG Affiliate link
This is a 32GB DDR4-2400 ECC registered DIMM from SK Hynix. It features dual-rank architecture and is designed specifically for server environments. The module operates at 2400 MT/s with error-correcting code support to maintain data integrity. It measures 6 inches in length and 0.2 inches in height. You should choose this kit if you need reliable server memory with higher speeds than standard 2133 MHz options.
Pros
- 32GB capacity per stick
- DDR4-2400 speed rating
- ECC support for error correction
- Registered dual-rank design
Cons
- Only compatible with server motherboards
- No dual-channel kit option listed
- Higher latency than desktop DIMMs
Good fit if
- You are building a server system
- You need ECC memory for stability
- You require 2400 MHz speeds
Skip if
- You are using a consumer desktop PC
- You need non-ECC unbuffered memory
- You want a dual-channel kit
Verdict: SK Hynix 32GB DDR4-2400 ECC REG is a specialized server memory module that offers higher speeds than 2133 MHz alternatives. It fits users who need ECC reliability and registered DIMMs for their server workloads.
Specifications side by side
| Spec | SK Hynix 32GB DDR4-2133 RDIMM | SK Hynix 32GB DDR4-2400 ECC REG |
|---|---|---|
| Total Capacity | 32GB | 32GB |
| Memory Speed | 2133 MHz | 2400MHz |
| Module Configuration | 1x32GB | not stated |
| Form Factor | U-DIMM | DIMM |
| ECC Support | ECC RDIMM | ECC REG |
| Compatible Device | not stated | Server |
| Size | 32GB | 32GB |
| Dimensions | 5.25 × 0.16 × 1.21 inches | 6 × 1 × 0.2 inches |
| Weight | 1.12 ounces | not stated |
| Model | HMA84GL7MMR4N-TF | HMA84GR7MFR4N-UH |
| Color | not stated | Multicolor |
Frequently asked questions
Can I use these ECC RDIMM kits in a standard desktop PC?
No, you cannot. Both modules are Registered DIMMs designed specifically for server systems. Standard desktop motherboards do not support ECC registered memory. You need a server platform that explicitly lists compatibility with RDIMM modules to use either of these SK Hynix kits.
What is the physical size difference between the two memory modules?
The modules have different dimensions. The DDR4-2133 kit measures 5.25 inches in length, while the DDR4-2400 version is 6 inches long. Both share a width of 1 inch. These physical differences ensure they fit correctly into server slots designed for their specific form factor.
Do both kits provide error correction for data integrity?
Yes, both kits include ECC support. This feature detects and corrects single-bit memory errors, which is critical for server environments. You can rely on this stability for both the 2133 MHz and 2400 MHz options, as both are built for systems requiring high data reliability.
Which module offers faster data transfer rates?
The second module offers faster rates. It runs at DDR4-2400, which is quicker than the 2133 MHz speed of the first kit. If your server platform supports the higher clock speed, this option provides increased bandwidth for demanding workloads and improved performance for data-intensive tasks.
Are these memory kits compatible with consumer-grade gaming rigs?
They are not compatible. These are server-grade RDIMM modules with ECC support. Consumer gaming motherboards typically use non-ECC UDIMM modules. Using these server kits in a standard gaming PC will likely result in the system failing to boot or recognizing the memory.
What is the total capacity of each individual module?
Each module holds 32GB of memory. Both the 2133 MHz and 2400 MHz versions provide this same capacity. You can install them individually or in pairs to achieve higher total system memory, depending on your server's maximum supported capacity and available DIMM slots.