2.0Ghz??

jamesjingyi

macrumors 6502a
Original poster
Dec 20, 2011
792
32
UK
I probably sound like a massive noob but my MacBook Black from 2007 has the same amount of Ghz as the new MacBook Air when it's maxed out.
How come mine is so weak compared to it?
 

GGJstudios

macrumors Westmere
May 16, 2008
44,419
758
I probably sound like a massive noob but my MacBook Black from 2007 has the same amount of Ghz as the new MacBook Air when it's maxed out.
How come mine is so weak compared to it?
It's not just the GHz. It's a completely different processor:
MacBook Air "Core i7" 2.0 13" (Mid-2012) Specs
This model is powered by a 22 nm, 64-bit Intel Mobile Core i7 "Ivy Bridge" (I5-3667U) processor which includes two independent processor "cores" on a single silicon chip. Each core has a dedicated 256k level 2 cache, shares 4 MB of level 3 cache, and has an integrated memory controller (dual channel).

This system also supports "Turbo Boost 2.0" -- which "automatically increases the speed of the active cores" to improve performance when needed (up to 3.2 GHz for this model) -- and "Hyper Threading" -- which allows the system to recognize four "virtual cores" or "threads."
 

jamesjingyi

macrumors 6502a
Original poster
Dec 20, 2011
792
32
UK
Yeah that says about the GHz, but how come the new i7 processor runs at the same GHz as my ancient MacBook?
 

GGJstudios

macrumors Westmere
May 16, 2008
44,419
758
Yeah that says about the GHz, but how come the new i7 processor runs at the same GHz as my ancient MacBook?
A more advanced processor will achieve greater performance at the same clock speed as a less advanced processor. Clock speed is not the only factor in determining processor performance.
 

imageWIS

macrumors 65816
Mar 17, 2009
1,241
740
NYC
A more advanced processor will achieve greater performance at the same clock speed as a less advanced processor. Clock speed is not the only factor in determining processor performance.
This. Plus the RAM speed / amount and the HD read / write speed are also big factors in overall speed.
 

atMac

macrumors 6502
Jun 20, 2011
328
0
You can only compare GHz to GHz when talking about the same CPU family.

IE: Core2 Duo vs Core2 Duo, or SandyBridge vs SandyBridge

What changes is the amount of work that each 1MHz does on the CPU, so while a Core2Duo may run 2.0 GHz like a 2.0GHz IvyBridge then that IvyBridge may be more efficient and make that 2.0 GHz do 2x's more work at the same speed, making it about as fast as a 3.8 - 4.0 GHz Core2Duo.

Does that help explain? It's actually a bit more complicated than that, but you should get the general idea.
 

richard.mac

macrumors 603
Feb 2, 2007
6,299
2
51.50024, -0.12662
Yeah that says about the GHz, but how come the new i7 processor runs at the same GHz as my ancient MacBook?
He was also asking why it has the same frequency (GHz) as his old MacBook.

The MacBook Airs use an ultra low power CPU to allow it to be cooler in such a small body. Being ultra low power means that it will have a lower frequency, but as robvas said, it also has turboboost to increase the frequency for when the CPU is not using all of its cores and power.