Dell Optiplex 755 Mt Processor Upgrade Issue

I have a dell optiplex 755 mt that was purchased as a barebones w/o a processor, memory or hd. I upgrade and added 250 gb hard drive 2gb memory and a e8400 dual core processor. When i start it up i get the dell screen and able to select f2 setup and get into the bios setting (have a04 bios) the processor shows all the correct info and the drives are also listed. When i try to boot up and install os i get "system does not support installed processor"

I also tried making a bootable cd with dos and adding the newest bios a11. Start up and selected f12 selected boot from cd and just goes to the same message processor not supported. I have seen other 755's listed in the dell outlet that show the e8400 cpu being used. Will this cpu work or will i have to get a different one?

Read that the e6850 was used in the 755. What is the difference in these two cpu's

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