Hello everybody!
Do I lose not computing tasks when I upgrade CPU only?
I wish upgrade socket 771 to 775, Celeron to Xeon.

I mean the following scenario. Now competitions pentathlon and have cache tasks for several days.
If the project issues tasks for one computer ID, after change the CPU theoretically he must to change.
Will the project server task ID issued by one computer, and received from the other? I don't want lose cache.

Any time your are upgrading the CPU and/or GPU/graphics card in a computer there is a good chance of the old/"new" computer receiving a new HOST ID number on EACH project. There is no guarantee that BOINC will keep the old tasks to run post upgrade.

When doing hardware upgrades it is ALWAYS best practice to finish ALL tasks in progress on that PC BEFORE doing the upgrade by setting No New Tasks on ALL your projects.

Once the active tasks have completed, make sure they have successfully UPLOADED and REPORTED BEFORE shutting down BOINC and the PC to do the upgrade(s).

Well, I thought so
Thank you for answer.