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Two green 240-pin DDR3 RDIMM modules with black chips no heat spreader

OWC

OWC 16GB (2x8GB) DDR3 1600 CL11 ECC Registered RDIMM memory upgrade

SKU CH-ADNZ-SWS9Z

16 GB dual-channel DDR3-1600 ECC registered RDIMM kit for HP Z620 workstations

  • Capacity16GB (2 x 8GB)
  • Type240-Pin DDR3 ECC RDIMM
  • SpeedDDR3 1600 (PC3 12800)
  • CAS LatencyCL11
  • Voltage1.5V
  • ECCYes

Capacity 16GB (2 x 8GB)

  • ECC registered design protects data integrity in workstations
  • 16 GB kit (2 × 8 GB) expands HP Z620 memory capacity
  • DDR3 1600 CL11 at 1.5 V matches factory specifications
  • 240-pin RDIMM form factor fits server and workstation slots
  • Replaces multiple HP part numbers for direct compatibility

Targeted Workstation Upgrade

This 16 GB kit contains two 8 GB DDR3 1600 CL11 registered ECC modules built for the HP Workstation Z620. It is designed for administrators and engineers who need error-correcting memory in a validated server platform. The modules will not work in standard desktop computers or alongside unbuffered DIMMs.

Thermals and Power Draw

Operating at the JEDEC-standard 1.5 V, the sticks draw typical DDR3 registered power without a heat spreader. Passive cooling in a Z620 chassis keeps temperatures within specification during sustained workloads. Acoustic output remains unchanged because the memory adds no moving parts.

What the Kit Changes

Installing the pair doubles the Z620's memory capacity to 16 GB and enables ECC protection for data integrity. The registered design reduces electrical load on the memory controller, allowing stable operation at full population. No software or firmware updates are required beyond the standard BIOS.

Highlights

  • ECC registered design protects data integrity in workstations
  • 16 GB kit (2 × 8 GB) expands HP Z620 memory capacity
  • DDR3 1600 CL11 at 1.5 V matches factory specifications
  • 240-pin RDIMM form factor fits server and workstation slots
  • Replaces multiple HP part numbers for direct compatibility

Specifications

BrandOWC
Part Number1R6D31R4016P
Capacity16GB (2 x 8GB)
Type240-Pin DDR3 ECC RDIMM
SpeedDDR3 1600 (PC3 12800)
CAS LatencyCL11
Voltage1.5V
ECCYes
Buffered/RegisteredRegistered
Rank1Rx4
Heat SpreaderNo
Compatible SystemHP Workstation Z620

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Questions about this item

How do I install the 240-pin DDR3 ECC RDIMM modules in the HP Z620, and which step is often done wrong?

Power off and unplug the workstation, open the chassis, locate the eight DIMM slots grouped by processor, and insert each 240-pin module until the side latches click. The step people miss is seating both ends evenly; a tilted module will not register and can cause boot failure.

What maintenance or replacement will the 16 GB DDR3 1600 ECC registered kit need over time?

The modules have no heat spreaders and no moving parts, so no routine maintenance is required. If a DIMM fails, the ECC function will log correctable errors in the system event log, and the faulty 8 GB stick can be swapped individually without replacing the matched pair.

What limit appears first when the HP Z620 runs sustained workloads with this 1.5 V DDR3 1600 CL11 memory?

The memory controller caps bandwidth at the rated DDR3 1600 PC3-12800 speed, so throughput plateaus there. Under heavy sustained loads the registered buffer adds one cycle of latency, making CAS 11 the practical latency floor before the CPU or memory bus becomes the bottleneck.

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