The Turbo-boost feature of the quad-core Core i5 and i7 chips can shut
down unused cores and boost the clock speed of the remaining cores to
much faster clock speeds depending on usage:
The 2.66 GHz Core i5 has a Turbo Boost speed of up to 3.20 GHz
the 2.8 GHz Core i7 can go up to 3.46 GHz in Turbo Boost mode.
At the other end of the spectrum, the Core i7 also supports Hyper-
threading which effectively gives you twice the number of logical
cores for a grand total of 8 cores. If you need to run lots of apps
at once or you have things like video compression jobs and VMware and
other multi-threaded apps running and want to spread your load over
multiple CPUs, this feature can be very useful. The Core i5 however
does not support Hyper-threading.
I've found hyper-threading very useful on my 8-core Nehalem Mac Pro as
with hyper-threading Mac OS X shows it is running on a 16 core
monster. I am able to fully max out my 12GBs of RAM running several
video compression jobs (which are each multi-threaded over up to 4
cores each), dual-core Windows XP and a second dual-core VM running
Vista, and a stack of other Mac apps without any slow downs at all.
It is not quite as fast as 16 real cores, but it definitely does
encoding and other multi-threaded tasks faster than 8 maxed-out
physical cores. (having 4 x 1TB drives hardware RAIDed internally
helps a lot as well so that disk access doesn't become the bottleneck).
-Mart
On 22/10/2009, at 9:32 AM, Craig Bruce wrote:
Indeed the 2.66 is a core i5 quad core rather than a core 2 dual core
it can also be build with the core i7 as a custom build
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On 22/10/2009, at 9:17 AM, Daniel Forsdyke wrote:
Hi Adrian
I believe the 'slower' machine has a quad core processor rather
than the dual core on the other one.
Regards
Daniel Forsdyke
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On 22/10/2009, at 9:13, Adrian Skehan <adrianske...@mac.com> wrote:
Good morning all,
Looking at the latest iMac I notice that the 27-inch: 3.06GHz list
price is $2,199 and the 27-inch: 2.66GHz is $2,599 that is an
extra $300 for a seemingly slower machine. Have I missed
something or is 2.66GHz quicker than 3.06GHz?
Regards,
Adrian
adrianske...@me.com
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