Dell optiplex 745 upgrade cpu

i want to upgrade the cpu in my dell optiplex 745 because i want to run a 64 bit operating system. but because i have the pentum D it only supports the 32 bit operating system. what cpu do i buy?
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More about dell optiplex upgrade
  1. pentium d supports 64bit i have that system it runs great
  2. si lo soporta pero mi pc tiene core 2 duo de 3.4 y 8gb de ram
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