Intel Core 2 Duo E7200 @ 2.53GHz socket is a "LGA775" and the processor i want to go to is a intel Xeon X3380 @ 3.16 GHz
the duo core has 2 cores no hyperthreading the xeon is a quad core and no hyperthreading
All C2D and Core i CPUs are x86 CPUs with 64-bit instruction extensions.
Just because you can physically install the Xeon CPU does not mean it will be recognized by the motherboard. The motherboard has a BIOS which basically allows it to recognize CPUs. If the BIOS does not contain any information pertaining to the CPU you want to install, then your new CPU will not be recognized and will not work.
As stated before, go to the motherboard's manufacturer website to find a list of compatible CPUs. If it is listed, then you may need to flash your motherboard to upgrade the BIOS.
different mobos in the Inspiron 530 towers
one supports only C2Ds
the other supports C2Q
I believe yours only supports C2Ds up to E8500
careful with dell cpu upgrades
while the chipset might support it
The bios might not
with the Inspiron the C2Q mobo was able to supply more voltage/wattage
due to different VRM (voltage regulator module)