Faster PXE boot times in SCCM 1606 and later

A new feature introduced with SCCM 1606 was being able to modify the boot times for PXE. This is done by modifying the TFTP block and window size of the boot image RamDisk. This was originally implemented to help a admin over come network requirement. This allows us to make the PXE boot times much faster for my self this meant taking a 10 minute boot time all the way down to 30 second boot time. In order to make this change you need to create 2 registry keys on your PXE enabled DP.

Name: RamDiskTFTPWindowSize
Value: <customized window size>
The default value is 1 (1 data block fills the window) 

Name: RamDiskTFTPBlockSize
Value: <customized block size>
The default value is 4096 (4k). 

once you have added the registry keys you will need to restart  the Windows Deployment Service for the changes to take affect. 

Below is a table of results for each combination of Window and Block sizes created by Jorgen Nilsson of From the link you can also get more information on the settings as well as a Tool to create the keys and restart the Windows Deployment Service for you. 

Other information on this setting


  1. You write this post very carefully I think, which is easily understand to me. Not only this, other post is also good. As a newbie this info is really helpful for me. Thanks to you.
    Tally Training in Chennai
    Tally ERP 9 Training
    tally classes
    Tally Training institute in Chennai
    Tally course in Chennai

  2. Nice blog, it’s so knowledgeable, informative, and good looking site. I appreciate your hard work. Good job. Thank you for this wonderful sharing with us. Keep Sharing.
    Digital Marketing Course In Kolkata
    Web Design Course In Kolkata


Post a Comment

Popular posts from this blog

How to Deploy a Windows 10 Servicing update as a Application

SCCM Task Sequence GUI - How to set up the TS to work with a GUI