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Green rectangular DDR3 DIMM with black chips on both sides, gold contacts along bottom edge

OWC

OWC 4GB DDR3 1066 PC3-8500 CL7 2Rx8 240-pin 1.5V Non-ECC UDIMM memory upgrade

SKU CH-ESSN-GXCHZ

Adds 4 GB of DDR3 1066 CL7 memory to Lenovo ThinkCentre M58p SFF or Tower systems

  • Total capacity4 GB
  • Rated speedDDR3 1066 (PC3 8500)
  • CAS latencyCL7
  • Rated voltage1.5 V
  • Buffer typeUnbuffered
  • Memory rank2Rx8
  • 4GB capacity adds multitasking headroom for Lenovo ThinkCentre M58p
  • DDR3 1066 PC3-8500 CL7 speed matches factory specifications exactly
  • 5V JEDEC-standard voltage ensures warranty-safe installation
  • 240-pin UDIMM form factor fits SFF and Tower chassis directly
  • 2Rx8 unbuffered non-ECC design delivers reliable desktop performance

Compatible Lenovo ThinkCentre upgrade

This 4GB DDR3 module is built for Lenovo ThinkCentre M58p SFF and M58p Tower systems. It delivers a straightforward capacity increase for older workstations that still use DDR3 memory. The single DIMM fits directly into an available 240-pin slot without configuration changes.

JEDEC-standard thermals and power

The module runs at the standard 1.5V DDR3 voltage with CL7 latency at 1066 MHz. As an unbuffered non-ECC DIMM without a heat spreader, it operates within normal desktop thermal limits and adds minimal power draw to the system. No active cooling or special airflow is required beyond the case fans already present.

Plug-in capacity for two form factors

The 240-pin UDIMM installs in either the small-form-factor or tower chassis of the supported ThinkCentre models. It leaves remaining slots free for additional matched modules if the board allows. Builders needing ECC, registered memory or speeds beyond DDR3 1066 should look elsewhere.

How it compares

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

Price $16.99
Cheaper than about 93% of the 21,161 comparable items (median $397.99).
Total capacity 4 GB
Lower than about 90% of the 20,941 comparable items (median 32 GB).
Price per GB $4.25 per GB
Cheaper than about 83% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number8U5D32R804 GB
Total capacity4 GB
Product type240-Pin DDR3 Non-ECC UDIMM
Performance
Rated speedDDR3 1066 (PC3 8500)
Memory
CAS latencyCL7
ECC supportNo
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.5 V
Compatibility
Compatible systemsLenovo ThinkCentre M58p SFF
Lenovo ThinkCentre M58p Tower

Other versions of this model

5 more in the same range

Questions about this item

How do I install the 240-pin DDR3 module in my ThinkCentre M58p, and what step do people often miss?

Power off and unplug the system, open the case, align the notch on the 240-pin DDR3 module with the slot key, press firmly until both retention clips click, then verify in BIOS that the 4GB 1066 CL7 module is detected at 1.5V.

What maintenance or replacement will this 4GB DDR3 1066 CL7 module need over time?

No scheduled maintenance is required; keep interior dust-free for airflow. Replace only if memory diagnostics report errors or if you upgrade capacity beyond the single 4GB 2Rx8 UDIMM.

What limit appears first when this 1.5V DDR3 1066 module runs sustained workloads?

The 1066 MT/s data rate and CL7 latency set the throughput ceiling; sustained loads will hit that bandwidth limit before the 1.5V thermal envelope becomes a concern.

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