I don't know whether to use Intel x86 or AMD64 image on my computer. I have a 2011 Macbook Air with a Sandy Bridge i7 and Intel HD3000 which is definately capable of handling 64 bits, however, due to the wording on Ubuntu's website. It says that Intel x86 should be used on almost all pcs as well as newer Intel Macs. Since I clearly have an Intel Mac, should I be using Intel x86 image?
Ubuntu MATE is currently available for four architectures, PC (Intel x86), 64-bit PC (AMD64), Mac (PowerPC) and IBM-PPC (POWER5) and Raspberry Pi 2 aarch32 (ARMv7).
PC (Intel x86) For almost all PCs. This includes most machines with Intel/AMD/etc type processors and almost all computers that run Microsoft Windows, as well as newer Apple Macintosh systems based on Intel processors. Choose this if you are at all unsure.
64-bit PC (AMD64) Choose this to take full advantage of computers based on the AMD64 or EM64T architecture (e.g., Athlon64, Opteron, EM64T Xeon, Core 2). If you have a non-64-bit processor made by AMD, or if you need full support for 32-bit code, use the Intel x86 images instead.
Mac (PowerPC) and IBM-PPC (POWER5) For Apple Macintosh G3, G4, and G5 computers, including iBooks and PowerBooks as well as older IBM OpenPower 7xx machines.