OWC 32GB DDR4-2933 CL21 RDIMM (2933D4MP32GB)
This 32GB DDR4-2933 ECC registered module is purpose-built for the 2019 Mac Pro, featuring a Mac-qualified thermal sensor EEPROM for proper system integration. It provides a straightforward, warranty-safe performance boost with JEDEC-compliant specifications and a limited lifetime warranty. This memory is best for Mac Pro 7,1 tower or rack owners needing to upgrade their workstation's capacity for memory-intensive server or professional tasks.
Snapshot
The 30-Second Version
The right RAM for a 2019 Mac Pro, nothing more, nothing less. Buy it if you need capacity, skip it if you don't own the machine it's made for.
Pros & Cons
Pros
- Mac qualified thermal sensor EEPROM, the Mac Pro actually reads it 90th
- ECC registered memory means fewer crashes on long renders 71st
- Limited lifetime warranty with OWC's advanced replacement program
- Works alongside Apple and OWC 8GB, 16GB, and 32GB modules
Cons
- CL21 latency is nothing to brag about
- Pricey compared to non-ECC DDR4
- Only makes sense for one specific Mac model
- Can't mix with LRDIMM modules
What owners think
The Word on the Street
The proof
Performance
The 2933 MT/s speed lands in the middle of the pack for DDR4 overall, but that's the ceiling for the Mac Pro 7,1 platform anyway. You're not leaving performance on the table. The CL21 latency is a bit loose compared to gaming RAM, but ECC registered memory always trades a little speed for error correction and stability. For rendering, virtualization, or anything that eats RAM, this does exactly what it should. The 8-layer PCB is a nice touch for signal integrity when you're running six or eight of these together.
Specifications
Full Specifications
Memory
| Type | DDR4 |
| Form Factor | RDIMM |
| Total Capacity | 32768 |
| Modules | 1 |
| Per Module | 32768 |
| Pins | 288 |
Performance
| Speed | 2933 |
| CAS Latency | 21 |
| Voltage | 1.2 |
Class
| ECC | Yes |
| Registered | Yes |
Features
| RGB | No |
| Heat Spreader | No |
vs Competition
The competitors listed here are all DDR5 gaming kits, which is a completely different world. A G.Skill Trident Z5 or Kingston FURY Beast kit will run circles around this in raw speed, but they won't even fit in a Mac Pro. The real comparison is against Apple's own RAM pricing, which makes this look like a bargain. Against other ECC RDIMMs from Crucial or Kingston, OWC's main edge is the Mac-specific thermal sensor validation and their replacement warranty. If you're building a PC, buy the DDR5. If you own a Mac Pro 7,1, this is one of your only sensible options.
| Spec | OWC 32GB DDR4 RDIMM | Kingston FURY Beast KF564C32BWEAK2-64 | Corsair VENGEANCE RGB CMH64GX5M2Y6400C32 | G.Skill Ripjaws S5 F5-6400J3239G32GX2-RS5K | Crucial Pro Overclocking CP2K16G64C32U5B | KLEVV CRAS V RGB KD5KGUD80-60A300G-BLACK |
|---|---|---|---|---|---|---|
| Capacity | 32GB | 64GB | 64GB | 64GB | 32GB | 64GB |
| Kit | 1 x 32GB | 2 x 32GB | 2 x 32GB | 2 x 32GB | 2 x 16GB | 2 x 32GB |
| Memory Type | DDR4 | DDR5 | DDR5 | DDR5 | DDR5 | DDR5 |
| Speed Mts | 2933 | 6400 | 6400 | 6400 | 6400 | 6000 |
| Cas Latency | CL21 | CL32 | CL32 | CL32 | CL32 | CL30 |
| Form Factor | RDIMM | UDIMM | UDIMM | UDIMM | UDIMM | UDIMM |
| Ecc | true | false | false | false | false | false |
| Compare | Compare | Compare | Compare | Compare |
| Product | Speed | Feature | Latency | Capacity | Social Proof | Affordability |
|---|---|---|---|---|---|---|
| OWC 32GB DDR4 RDIMM | 43.6 | 89.6 | 29.5 | 70.8 | 50.4 | 32 |
| Kingston FURY Beast KF564C32BWEAK2-64 Compare | 94.8 | 89.6 | 87.6 | 89.8 | 92.3 | 7.4 |
| Corsair VENGEANCE RGB CMH64GX5M2Y6400C32 Compare | 94.8 | 89.6 | 87.6 | 89.8 | 97.8 | 6.7 |
| G.Skill Ripjaws S5 F5-6400J3239G32GX2-RS5K Compare | 94.8 | 74.9 | 87.6 | 89.8 | 85.7 | 5.2 |
| Crucial Pro Overclocking CP2K16G64C32U5B Compare | 94.8 | 74.9 | 87.6 | 70.8 | 85.7 | 27.2 |
| KLEVV CRAS V RGB KD5KGUD80-60A300G-BLACK Compare | 87.6 | 89.6 | 87.6 | 89.8 | 85.7 | 9.2 |
Price
Value & Pricing
At roughly $478 USD for a single 32GB stick, this is not cheap. But ECC RDIMMs for the Mac Pro are a niche product, and OWC is one of the few companies that actually validates against Apple's thermal sensor requirements. If you need the capacity, you pay the Apple tax. The lifetime warranty softens the blow a little. For a workstation that can cost $10,000 or more, this is a reasonable upgrade cost.
Amazon 1 offer From $478
Price History
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Overview
This is a 32GB stick of ECC registered DDR4 built specifically for the 2019 Mac Pro. If you own that machine and need to add RAM without drama, this is the boring, reliable choice. It runs at 2933 MT/s with CL21 timings, which is exactly what Apple's Xeon platform wants. Nothing flashy, just server-grade memory that plays nice with macOS. The thermal sensor EEPROM is the real selling point here, since the Mac Pro actually reads that data to manage fan curves.
Common Questions
Q: Will this work in a regular PC?
Technically yes, if your motherboard supports ECC registered DDR4. But you'd be paying extra for the Mac thermal sensor you can't use. Buy a standard ECC RDIMM instead and save some cash.
Q: Can I mix this with my existing Apple RAM?
Yes. It works with Apple and OWC 8GB, 16GB, and 32GB modules. Just don't mix it with LRDIMMs, that's a no-go.
Q: Is 2933 MHz fast enough for the Mac Pro?
Yes, that's the maximum speed the 2019 Mac Pro's memory controller supports. Anything faster would just downclock to 2933 anyway.
Who Should Skip This
If you don't own a 2019 Mac Pro or Mac Pro Rack, this isn't for you. PC builders should grab a DDR5 kit for less money and way more speed. And if you're trying to upgrade a MacBook, iMac, or Mac mini, this physically won't fit. Go find the right SODIMM or soldered solution for your machine.
Verdict
If you own a 2019 Mac Pro and need to add memory, buy this. It's validated for the platform, carries a lifetime warranty, and OWC's support actually knows Mac hardware. The only reason to look elsewhere is if you find a compatible Kingston or Crucial ECC RDIMM for significantly less money. But for most Mac Pro owners, the peace of mind is worth the premium.
Usage Scores
- Overall52.5
- Budget65.2
- Gaming42.5
- Laptop39.2
- Server74.8
- Workstation53.3
