Understanding Precision Workstation T7500/T5500/T3500 memory speeds

Understanding Precision Workstation T7500/T5500/T3500 memory speeds


Article Summary: This article provides information on "Understanding Precision Workstation T7500/T5500/T3500 memory speeds".


Table of Contents:

  1. Why am I not getting the rated speed for my system memory?
  2. T7500/T5500/T3500 memory configurations



1. Why am I not getting the rated speed for my system memory?

Memory speeds on a Precision Workstation T7500/T5500/T3500 systems vary based on the front side bus speed of the processor configured in the system build. The speed between the central processing unit (CPU) and chipset is measured in Giga-Transfers per second (GT/s) Quick Path Interconnect (QPI) speed.

For a 4.8 GT/s QPI (E5506, E5504, E5502) CPU the memory speed will be limited to 800MHz
For a 5.86 GT/s QPI CPU the memory speed will be limited to 1066MHz

The speed limitations exist even if the system order shows the memory to be rated at 1066MHZ\1333MHZ.


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2. T7500/T5500/T3500 memory configurations



Any of the hex core processors that indicate 6.4 GT/s QPI will operate at 1333MHz with supported memory.

Some examples include the following:

a. Six Core Intel(r) Xeon(r) W3680 3.33GHz, 12M L3, 6.4GT/s
b. Six Core Intel(r) Xeon(r) Processor X5670, 2.93GHz,12M L3, 6.4GT/s, turbo
c. Six Core Intel(r) Xeon(r) Processor X5650, 2.66GHz,12M L3, 6.4GT/s, turbo

On systems having lower GT/s, the memory speed will be limited to 800Mhz or 1066Mhz based on the CPU installed in the system.

This configuration is working within normal specification.
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Article ID: SLN247624

Last Date Modified: 01/19/2015 08:44 AM


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