Article Number: 000178714
Why My Precision Workstation T1650 Won't Post, Boot, or Recognize Memory Correctly after Upgrading Memory
Summary: This article contains information regarding why my Precision Workstation T1650 won't POST, boot, or recognize memory correctly after upgrading the memory.
Article Content
Symptoms
Table of Contents:
| 1. | Maximum Size of Memory Supported in the T1650 |
The Precision T1650 supports up to 32 GB of memory of either ECC (Error Checking and Correction) or non-ECC DIMMs. The following chart provides supported memory population configurations:
The version of Windows installed on the T1650 will also affect the amount of memory the operating system can recognize. 32-bit versions of Windows will only recognize a maximum of 4 GB of memory, and there are further limitations with some 64-bit versions of Windows. Check the memory limits for the different versions of Windows
to ensure your version of Windows is able to fully utilize the memory upgrade. Back to Top
| 2. | Memory Population Rules |
The memory controller on the T1650 supports dual-channel memory bus architecture. To ensure maximum channel performance, memory modules should always be installed in pairs of matched size, speed, and technology.
If the channels do not match or if the system has only one DIMM installed, the system memory operates in single-channel mode or in dual-channel asymmetrical mode. The system works normally in single-channel mode, but loses the benefit of increased memory throughput from the dual-channel configuration. The chart below outlines the memory configuration and corresponding channel performance:
The picture below shows how the memory slots are situated on the motherboard below the CPU:
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| 3. | Memory Speeds Supported |
The T1650 supports DDR3 SDRAM modules with speeds of 1333MHZ and 1600MHZ. DDR3 memory provides a boost in access speed, and also allows for individual chip capacities up to 8 GB on each memory module. A motherboard which supports DDR3 can only support this memory type as it is keyed differently than previous memory modules:
When memory modules of different speeds are installed, all DIMMs will operate at the speed of the slowest installed DIMM. For example, if the system includes a mixed configuration of 1333MHZ and 1600MHZ memory modules, the overall system memory access speed will be 1333MHZ.
The performance speed of the memory also depends on the type and model of processor (CPU) installed in the system. Only quad core processors can support memory speeds up to 1600MHZ. A memory module rated at 1600MHZ will run at a reduced speed when paired with a processor that doesn't support it. The chart below outlines the processors that were offered for the Precision T1650 and the memory speeds each processor supports:
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Cause
Resolution
Article Properties
Affected Product
Precision T1650
Last Published Date
22 Apr 2022
Version
5
Article Type
Solution