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Green 240-pin DDR3 DIMM module with black chips and gold contacts

Crucial

Crucial CT8G3W186DM 8GB DDR3 1866 ECC memory upgrade

SKU CH-HABG-DN7Y1 MPN CT8G3W186DM

8GB 240-pin DDR3 ECC module running at 1866MHz with CAS 13 latency for Mac Pro systems

  • Total capacity8 GB
  • Rated speedDDR3 1866 (PC3 14900)
  • CAS latency13
  • Rated voltage1.5 V
  • Buffer typeUnbuffered
  • Product type240-Pin DDR3 SDRAM
  • ECC protection guards data integrity on critical workloads
  • 1866 MHz DDR3 speed accelerates Mac Pro responsiveness
  • 8 GB capacity expands multitasking headroom for demanding apps
  • 240-pin unbuffered design fits Mac Pro memory slots directly
  • CAS latency 13 at 1.5 V balances throughput and stability

Mac Pro DDR3 ECC upgrade

This 8 GB Crucial module is built for Apple Mac Pro workstations that accept 240-pin DDR3 ECC UDIMMs. It adds capacity to systems used for content creation, virtualization or scientific workloads where error-correcting memory is required.

Check your Mac Pro memory slots

Verify that your Mac Pro model supports unbuffered DDR3 1866 ECC UDIMMs and has a free 240-pin slot. The module runs at 1.5 V with CAS latency 13, so the firmware must be able to configure those timings automatically.

Thermals and power in daily use

Standard DDR3 UDIMM power draw applies at 1.5 V during typical workloads. No active cooling is included; the module relies on the Mac Pro’s internal airflow. Acoustic output is silent because there are no moving parts on the memory itself.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $83.99
Cheaper than about 70% of the 21,161 comparable items (median $397.99).
Total capacity 8 GB
Lower than about 80% of the 20,941 comparable items (median 32 GB).
CAS latency 13
Lower than about 86% of the 483 comparable items (median 22).
Price per GB $10.50 per GB
Pricier than about 54% of the 20,941 comparable items (median $8.19 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameCrucial
Model nameCT8G3W186DM
Total capacity8 GB
Product type240-Pin DDR3 SDRAM
Performance
Rated speedDDR3 1866 (PC3 14900)
Memory
CAS latency13
ECC supportYes
Buffer typeUnbuffered
Power
Rated voltage1.5 V
Size & build
Shipping weight0.06 kg
Package size185 × 127 × 19 mm
Compatibility
Compatible withFor Apple Mac Pro System

Questions about this item

Does the 8 GB DDR3 1866 module arrive as a single stick or a kit, and are any tools required?

The module is supplied as a single 240‑pin DIMM; no tools are needed for installation in a compatible Mac Pro.

Should I choose this 1866 MHz CL13 ECC stick or a lower‑speed DDR3 alternative for my Mac Pro?

Select the 1866 MHz CL13 part when your Mac Pro supports PC3‑14900; it runs at the highest mainstream DDR3 ECC speed available.

What does the 1866 MHz rating mean once the memory is installed in a Mac Pro?

The memory will operate at 1866 MHz with CAS latency 13 at 1.5 V, delivering the fastest mainstream DDR3 ECC throughput the platform supports.

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