Registers are faster because ?

Question

can we see registers physically ? how many registers are there for one cpu ?

Answer 1

Number and size of registers are different among various Processors. A register may hold an instruction, a storage address, or any kind of data (such as a bit sequence or individual characters). i7 has 8 registers in 32 bit and 16 registers in 64 bit. Reading/writing registers isn't easily possible in C, and you have to use Assembly for complete access to registers.