Swapping CPUs

I have two Dell Optiplex machines with different motherboards and different CPUs.  I would like to know if I can swap the CPUs.  Here are the details:

Machine 1
Model: GX620
Motherboard: Dell - 0F8101
Socket: 478/LGA775
CPU: Intel Pentium 4 HT 3.4 GHz

Machine 2
Model: 745
Motherboard: Dell - 0GX297
Socket: LGA775
CPU: Intel Core 2 Duo 2.4 GHz

The BIOS info, according to SIW, for Machines 1 and 2 respectively are Dell 7 / Phoenix ROM BIOS PLUS v. 1.10 A11 and DELL  14 / Phoenix ROM BIOS PLUS Version 1.10 2.2.0.  I don't know if the former info is accurate, however, because I don't know where SIW reads that info from.  I recently ran a full BIOS update for the older machine (Machine 1), which I downloaded from Dell's website.

Mike

shachoAsked:
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imitchieConnect With a Mentor Commented:
Actually, sorry - no you cannot. The 620's mobo only supports up to Pentium D. If you need to put the C2Duo Cpu in there, consider SFF

Intel DG965MQ or DQ965CO
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imitchieCommented:
Yup, same boards. Just make sure the heat sinks match the HT is pretty hot
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shachoAuthor Commented:
Changing the board is not an option, so I guess I can't swap them.  Where did you find the info on the 620 mobo?  

Mike
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imitchieConnect With a Mentor Commented:
It uses an intel 945G chipset, which is just before C2D support

http://www.dellcommunity.com/supportforums/board/message?board.id=pw_upgrade&thread.id=7263
http://www.tomshardware.com/forum/244127-30-dell-optiplex-gx620-core

Note the 2nd one lists 0F8098, but that's a (prior) minor revision.
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shachoAuthor Commented:
Thanks!

Mike
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