Why Can’t Processors be round?
Cpu Chips- are made using wafers which are square at the time of manufacturing. Wafer cannot be cut easily as it looks,because the base silicon is too hard and the circuit is very gentle, so somehow while manufacturing it has to be broken, therefore in straight lines wafers can be seperated easily.
As being a Chip manufacturer you won’t like to get lesser returns by wasting chips in circular cutting, so to yield higher returns and save space in low cost square chips are made.
So,Now which is better Processor type square or Rectangle?
If You will compare two processors with same surface area, one rectangle and other square, when you will place them at their respective slots then you have to place heatsinks as per their shape and this would create the difference. As cpu coolers are round so heat distribution in square one will be more efficient than rectangular one. So the most preferrable cpu shape is square.