This question already has an answer here:
I got a Dell OptiPlex 9010 recently - it has an Intel® Core™ i7-3770 Processor. Intel declares in the specifications (http://ark.intel.com/products/65719/) that it's compatible with 64bit instruction set. But my BIOS tells me its EMT64 and not a true 64 bit processor.
So, which would be a better choice - 32 or 64 bit Ubuntu for this ? (I need to make best possible use of my 16 GB RAM, majorly for running monte carlo simulations for physics.)