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Crucial 16GB DDR4 SDRAM ECC Unbuffered DDR4 2666 (PC4 21300) Server Memory CT16G4WFD8266

Ships from United States. Most customers receive within 5-9 days.

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  • DDR4 2666 (PC4 21300)
  • ECC Unbuffered
  • CAS Latency 19

  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

Learn more about the Crucial CT16G4WFD8266

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): Lifetime
  • Limited Warranty period (labor): Lifetime
  • Read full details
Anonymous
Ownership: 1 week to 1 month
Verified Owner
5/ 5
Early Christmas for the Server 12/30/2019 3:31:23 PM

Overall Review: Christmas came early for the server this year. RAM works flawlessly.

Did you find this review helpful?
Ownership: 1 month to 1 year
Verified Owner
5/ 5
Works with ASRock x470 Master SLI/ac & Ryzen 7 3800x with 32GB to 64GB 12/4/2019 6:43:55 PM

Pros: - Crucial website shows it should work with x470
- Overclocks to DDR4-3200 (not that anyone should be doing that normally)
- The overclock frequency is not bad considering the stock frequency and timings
- Despite no so great timings compared to OC kits, it works really well with Zen2 CPU

Cons: - Not faster
- Passmark Memtest86 ECC functions not enabled for Zen2 CPU's yet. AMD needs to give them what they need to support Zen2 CPU's!

Overall Review: (review has been updated)
This ram seemed to operate correctly (recognized by Windows 10 with multi-bit correction) but my motherboard doesn't like warm reboot with this ram installed and initial recognition from the BIOS/UEFI is problematic when installing the ram (many reboots). Maybe Crucial can work with ASRock on this problem?

I'll have to wait until sometime in November to see if the new BIOS/UEFI versions to be released will improve the situation. Until then I had to pull the ram out and put it aside.

(Update 10/22/2019) After a few days passed after submitting a ticket with ASRock they replied and I was able to successfully test a beta BIOS. The initial recognition after installing the ram is fixed along with the warm reboot and boot loop problems are fixed.

(Update 12/04/2019) Working on beta BIOS L3.67 - AMD AGESA Combo-AM4 1.0.0.4 Patch B.
32GB DDR4-2666 ok - overclock to DDR4-3200 - ok (2 dimms)
64GB DDR4-2666 ok - overclock to DDR4-3200 - ok (4 dimms)
Stock Timings:
19-19-19-43-61 @1.2v
Overclock Timings:
20-20-20-44-66 tRFC=480 @1.35v

Also works on ASRock B450M Pro4 w/ BIOS/UEFI 3.50 & Ryzen 5 2600 CPU.

Increased to 5 eggs. Thank you ASRock!

2 out of 2 people found this review helpful. Did you?
Ownership: 1 month to 1 year
Verified Owner
5/ 5
Works perfectly in the Dell T30 10/22/2019 11:01:41 AM

Pros: Affordable, high-density, ECC, unbuffered RAM. Was disappointed how most ECC RAM you find is registered and therefore incompatible with a lot of systems. Was happy to find this unbuffered stuff. Booted up and tested fine after several runs of memtest86. Happy to have 64GB of RAM thanks to these sticks.

Cons: None

Overall Review: Works well and the price is right. Wish I could speak more to its compatibility with consumer motherboards as so many on here seem to be interested in that information.

Did you find this review helpful?
Ownership: 1 month to 1 year
Verified Owner
5/ 5
Works great with Ryzen 1800x in an Asrock x370 Taichi 10/1/2019 11:11:26 AM

Overall Review: I have four of these running in an Asrock x370 Taichi. They are running at the stock 2666 speeds and passed a full cycle of Memtest86. No crashes, ECC works, no problems at all. It's great having 64GB of RAM available to UnRaid.

2 out of 2 people found this review helpful. Did you?
Anonymous
Ownership: 1 week to 1 month
Verified Owner
5/ 5
Works great in B450 Pro4 with Ryzen 1600 9/12/2019 5:45:32 PM

Overall Review: Installed in a B450 Pro4 with Ryzen 1600 Freenas build and verified that ECC was working using Memtest86. Works great.

4 out of 4 people found this review helpful. Did you?
Anonymous
Ownership: 1 week to 1 month
Verified Owner
5/ 5
Working as expected with an ASRock B450 Pro4 board and Ryzen 1600 8/17/2019 12:57:05 PM

Pros: Confirmed ECC was enabled/functional using commands in both Win10 and Ubuntu. HWiNFO64 also indicated ECC was enabled/functional as did PassMark's Memtest86. Used Memtest86 to test over a few days with ECC error injection enabled and had zero issues.

Overall Review: FYI: Crucial's website says that this ECC memory is 100% compatible with both the ASRock AB350 Pro4 and X370 Pro4 boards but is incompatible with the B450 Pro4. I tried it out instead of pulling one of my first gen Ryzen boards from another system and it definitely works.

5 out of 5 people found this review helpful. Did you?
Ownership: 1 week to 1 month
Verified Owner
5/ 5
Works great with Ryzen 6/2/2019 6:01:28 PM

Pros: Loaded 4 of these sticks into Ryzen 1700 + Asrock X370 Taichi motherboard. POSTed first time, ECC was enabled and verified, and running at the rated 2666MHz. Using for a server and the server has been running a few weeks no with no hiccups. Asrock/Asus/Gigabyte typically have the best support for ECC on AM4, but always try to double check the motherboard page if it will support ECC or not.

Cons: Seems to go in and out of stock a lot, probably because it's such a good deal and works on Ryzen / Threadripper.

Overall Review: Highly recommend this RAM for new AMD platforms AM4/sTR4. The only CPUs ECC RAM won't work with currently are the 2200G and 2400G. All other Ryzen CPUs will support ECC RAM so long as the motherboard does too.

7 out of 7 people found this review helpful. Did you?
Ownership: 1 week to 1 month
Verified Owner
5/ 5
Works great 5/15/2019 5:36:22 AM

Pros: It is fast and reliable. For DDR4 EUDIMM. Requires a processor that supports unbuffered ECC RAM@2666Mhz, e.g., a threadripper CPU, and a motherboard that supports it as well.

Cons: None

5 out of 5 people found this review helpful. Did you?
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