socket 755 or LGA 755 question

I currently have a Dell optiplex 755.  

It says it currently sports a Intel Core 2 Duo E6550 @ 2.33 GHz.  

I need to upgrade video cards to a dual monitor output.  A friend gave me a GeForce 9800 GTX+ card that I plan to use. (Bare in mind, this is just a business machine).

So long story short.  It will not fit in the small form factor case.  I plan on getting a new motherboard and power supply and putting everything in a ATX case that I currently have.

My question is this.  Dell says this processor is a LGA 755 socket.  Is there a difference between a 755 and a LGA 755 or are they the same thing.  I would like to get a motherboard that I can use my existing CPU and RAM in.  Any suggestions?
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fixitnickAsked:
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lee555J5Commented:
Are you sure you do not mean "775"?
775 is 775. To my knowledge, anything labeled 775 is the same 775. IOW, they are the same.
I recommend http://www.newegg.com. 775 is older technology so pick one that meets your RAM and video needs and also has a good rating.
Lee
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CallandorCommented:
There is no such thing as a socket 755 or LGA 755 - you may have confused the Optiplex model with the socket.  Not all LGA775 socket cpus will work in any LGA775 motherboard; some of the later Wolfdales required a BIOS upgrade or compatible chipset.  Your E6550 runs on a 1333 FSB, so the motherboard must support this as one of the FSBs if you want to run it at the rated speed.
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fixitnickAuthor Commented:
Yes, I meant 775 sorry typo on my part.
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