what is the term which differentiate the Apple A7 and Apple A8 system on a chips?
Apple A7 The Apple A7 is a 64-bit system on a chip (SoC) designed by Apple Inc. It first appeared in the iPhone 5S, which was introduced on September 10, 2013. Apple states that it is up to twice as fast and has up to twice the graphics power compared to its predecessor, the Apple A6. While not the first 64-bit ARM CPU, it is the first to ship in a consumer smartphone or tablet computer.
IA-64 IA-64 (also called Intel Itanium architecture) is the instruction set architecture (ISA) of the Itanium family of 64-bit Intel microprocessors. The basic ISA specification originated at Hewlett-Packard (HP), and was evolved and then implemented in a new processor microarchitecture by Intel with HP's continued partnership and expertise on the underlying EPIC design concepts. In order to establish what was their first new ISA in 20 years and bring an entirely new product line to market, Intel made a massive investment in product definition, design, software development tools, OS, software industry partnerships, and marketing. To support this effort Intel created the largest design team in their history and a new marketing and industry enabling team completely separate from x86. The first Itanium processor, codenamed "Merced", was released in 2001.