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The CPU is soldered on the MB. To change to a different CPU you would have to replace the MB as shown on this page at Parts-People.

I am not a Dell employee...I am forum volunteer
Serious work on an E5430 and constantly building and working on an i5-6500 Desktop
Reply U2CAMEB4ME
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Posted July 7th, 2022 06:00
Welcome to the Dell Community @3US4
The CPU is fair, but you should have matching pairs of memory and not a mismatch.
With matching pairs you will be running in pure "Dual Channel" instead of the system having to constantly switch between "Single" and "Dual Channel".
Make sure to have "System Performance Options" set to "Adjust for Best Performance"
Set your "Virtual Memory" to "Custom Size"
Then set the "Initial Size" to 2-3 times the recommend size.
Then set the "Maximum Size" to 3-4 times the recommend size.
Best regards,
U2
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ejn63
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Posted July 7th, 2022 05:00
Even replacing the system board, there's no upgrade - you already have the fastest CPU this system was shipped with.