Hi, I have an optiplex gx620 currently running Windows 10 from Windows XP with a Pentium 4 HT. For a Processor upgrade I know the Pentium D series is recommended and a Pentium D 960 can be used with a copper heatsink, so my questions are could it run a Pentium extreme edition and what is the highest Pentium D it could run without upgrading the heatsink.

Thanks, Matt