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Eight green 240-pin DDR3 RDIMM modules in a row

OWC

OWC 256GB (8x32GB) DDR3 1066 PC3-8500 CL7 4Rx4 240-pin 1.5V ECC Registered RDIMM server RAM

SKU CH-6Z3E-SPSAB

Eight 32 GB DDR3 registered ECC modules running at 1066 MHz for servers and workstations

  • Capacity256GB (8 x 32GB)
  • Type240-Pin DDR3 ECC RDIMM
  • SpeedDDR3 1066 (PC3 8500)
  • CAS LatencyCL7
  • Voltage1.5V
  • ECCYes

Capacity 256GB (8 x 32GB)

Rank 4Rx4

  • 256GB kit maximises server capacity with eight 32GB modules
  • ECC registered design protects data integrity in critical workloads
  • DDR3 1066 CL7 timing delivers responsive multi-tasking throughput
  • JEDEC and RoHS compliant for warranty-safe upgrades
  • 5V registered DIMM lowers power draw per module

OWC 256GB DDR3 ECC RDIMM kit

This 256GB kit contains eight 32GB DDR3 registered DIMMs rated at 1066MHz with CL7 latency. It is built for workstations, servers and NAS systems that require ECC registered memory. The modules run at 1.5V and conform to JEDEC PC3-8500 specifications.

Not for desktop or unbuffered systems

Buyers with standard desktop motherboards cannot use this memory because it requires registered DIMM support and ECC capability. Systems that only accept unbuffered non-ECC modules are incompatible. Anyone needing a single module or a lower total capacity should choose a different kit.

256GB total capacity in eight modules

The kit delivers 256GB across eight 32GB sticks, which is the decisive figure for matching the memory slots and maximum supported memory of the target server or workstation.

Highlights

  • 256GB kit maximises server capacity with eight 32GB modules
  • ECC registered design protects data integrity in critical workloads
  • DDR3 1066 CL7 timing delivers responsive multi-tasking throughput
  • JEDEC and RoHS compliant for warranty-safe upgrades
  • 5V registered DIMM lowers power draw per module

Specifications

BrandOWC
Part Number8R5D34R4256K
Capacity256GB (8 x 32GB)
Type240-Pin DDR3 ECC RDIMM
SpeedDDR3 1066 (PC3 8500)
CAS LatencyCL7
Voltage1.5V
ECCYes
Buffered/RegisteredRegistered
Rank4Rx4
Multi-channel KitDual Channel Kit
Heat SpreaderNo

Other versions of this model

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Questions about this item

Should I pick the 256GB kit or the 32GB single module?

The 256GB kit contains eight matched 32GB modules tested together for multi-channel operation. Buying the kit ensures identical timing and rank across all slots, which registered server platforms require for stability.

What does the 1066MHz rating mean once the modules are installed?

The modules run at 1066MHz with CL7 latency, delivering a peak bandwidth of PC3-8500. In a registered ECC configuration the memory controller adds one cycle of buffering, so sustained throughput will be slightly below the theoretical maximum.

Is the 240-pin DDR3 interface limited to 1.5V or 1.35V in practice?

The specification lists 1.5V for this kit, while the JEDEC PC3L-8500 standard also permits 1.35V operation. Your platform's memory controller will negotiate the lowest supported voltage automatically.

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