Skip to main content
  • Place orders quickly and easily
  • View orders and track your shipping status
  • Create and access a list of your products

How Do I Determine the Data Rate of a DDR SDRAM Memory Module?

Summary: Location of the memory speed info and how to calculate this on your Dell system.

This article applies to This article does not apply to This article is not tied to any specific product. Not all product versions are identified in this article.

Symptoms

To determine the maximum tested speed of a DDR SDRAM memory module, every DDR module has a label. On this label is a number PCxxxx, where xxxx gives the maximum supported bandwidth of the memory module.

To find the data rate of the memory module, divide this number by 8, and you get an approximation of the data rate of the memory module, or the "speed." For example, to find the data rate of PC3700 memory use the following equation: 3700 / 8 = 462.5. This is an approximation of the data rate and would commonly be labeled as 466MHz memory.

For simplification, some of the numbers get rounded up or down and may not exactly match a data rate listed. Memory does not actually have a speed, but this number is the maximum tested rate at which the memory transfers data. Use the table below for a list of the PC ratings and DDR data rates of commonly available memory modules.

Check the Online System User’s Guide or Owner’s Manual on Dell Support for the Dell system in question to determine what memory functions with your system.

 


 

 

Affected Products

Desktops & All-in-Ones, Laptops
Article Properties
Article Number: 000148780
Article Type: Solution
Last Modified: 21 Feb 2021
Version:  3
Find answers to your questions from other Dell users
Support Services
Check if your device is covered by Support Services.