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Stretch

 
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Member Since: Jan 13, 2007
Location: Central New York
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Mac Specs: 15in i7 MacBook Pro, 8GB RAM, 120GB SSD, 500GB HD

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Gruber (DaringFireball) also points out that the speed benefits aren't just because its 64bit (64bit is just an added bonus) and that most of the speed boost is because the new ARMv8 architecture design for the new A7.

Quote:
What does this mean? It means, for one thing, that the biggest reason for the performance and power consumption improvements going from the A6 to A7 is the switch from the ARMv7 to ARMv8 architectures, not 32- to 64-bit. ARMv8’s improved instruction set alone has resulted in 15-20 percent performance gains while simultaneously using less power, from what I’ve been told by informed sources. And though Apple could have gone to ARMv8 while remaining 32-bit only, it made no sense not to go 64-bit.

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