The power supply burned out on my Gateway P4 HT, 3.06 GHz computer.  Tested with a good power supply and found the computer was still dead.   I've found a replacement P4 2.4 GHz motherboard and power supply on eBay.   Both boards are 478 pin sockets.  Can I swap the 3.06 GHz P4 hyper threader CPU with the 2.4 GHz P4 on the replacement board?
If a power spike damaged the board, what else may have been damaged?

ByronYou need to look at the documentation for both motherboards.
And u need the exact Intel number for each CPU. Intel mad a lot of CPIs and not all 478 pins are interchangeable.

Please try to find the specific information. Somewhere on the mobo there is an exact model number for either board.
Meanwhile, look this over if you need a refresher on the 478 socket. It was a good idea, but Intel left it behind.
http://en.wikipedia.org/wiki/Socket_478

The link below shows some differences with the huger speed CPUs in the 478 family. There is an concern with higher power requirements. So you need to consult the mobo documentation. Also, some of the CPUs vary a little in voltage. I am not sure if it  significant.
My guess is you shroud only use the CPU that came with the board.

http://en.wikipedia.org/wiki/List_of_Intel_Pentium_4_microprocessors GEEK
  OK, I have the replacement MoBo & power supply installed and the computer up & running,but s-l-o-w-e-r.   I found the 3.06 GHz chip in the chart linked.  The chip is a Northwood YORKTOWN SL6S5 386g12/512/533  serial L247a917-83512?  (It is very cool that these cpu's were named after US navy ships-Yorktown, Nimitz, Thresher, et al)  Both boards are AXT # D845GERG2/D845PECE.   I can't tell the # of the 2.4 GHz P4.  The heat sink is a newer design & I haven't figured out how to remove it.  All the hardware checks out by hardware manager. 
  Back to the question of whether I can swap the 3.06 GHz P4 HT for the 2.4 GHz P4 CPU installed on the board.  Documentation for the 3.06 GHz HT cpu says it can be installed on another board if the board RECEIVING it has the correct socket (it does) and is 32 bit.  The replacement board is running Windows XP PRO.  Does that mean it is 32 bit?
Now that the computer is running, I wish I had purchased a newer AXT board & larger power supply, even an SATA board & dual core processor was available on eBay for only a little more $.
Queries will be better if we know what MBoard we're dealing with...Yes, need to know motherboard.  Get CPU info here:  http://www.cpu-world.com/Thanks GEEK-9pm, patio & Computer-Comando! 
The links you posted were enough to tell me the switch could be made.  My YORKTOWN is running just fine with the 3.06 GHz P-4.  The last link had a statement that as long as the cpu's are 512/533, they can be switched.  They are & they did.The boards are Intel D845GERG2/D845PECE ATX .  The CPU'S are P-4 2.4 GHz 512/533 SL6DV costa RICA 3232A255-0035 and P-4 3.06GHz/512/533 SL6S5 malay L247A917-8732  (none of which matters now) Quote from: blithe SPIRITS on April 16, 2012, 02:22:54 PM

It is very cool that these cpu's were named after US navy ships-Yorktown, Nimitz, Thresher, et al