Depends on what year and what particular model. A new iMac base model comes with an Intel 2.5 GHz Quad Core i5 processor.
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The iMac G5 used a G5 processor - hence the name. This was the last of the PPC processors that Apple used before switching to the Intel processors. It followed on from the G3 and G4 processors found in earlier iMacs and iBooks.
The technical specifications of the new iMac depend on which one you buy. There are 21.5" and 27" version which have processors ranging from 2.7GHz to 3.2GHz.
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Depends on processor-: for intel i3 processors, highest frequency is 1333mhz for intel i5 processors, highest frequency is 1333mhz,(supports 1066mhz too) for intel i7 processors-: for i7-8xx & i7-2xxx series-highest frequency is 1333mhz for i7-9xx series-highest frequency is 1066mhz.
The first Mac with Quad Core processors went on sale in 2009.
Before Apple started using Intel processors in their iMacs they used a Power PC processor. The G3 was the third generation of these processors. It was followed by the G4 and G5. The G3 iMac was discontinued in 2003 and is not powerful enough to run today's software although it would suffice for basic email, text editing type work.
by knowing 1. the socket on your motherboard and 2. the frequency it supports
If you are seeing it on the Apple website the specifications are listed there.
The difference between the various iMac models typically lies in their specifications, such as screen size, processor type, graphics capabilities, and storage options. For instance, the 24-inch iMac features Apple's M1 chip and a more vibrant display compared to the older 27-inch model, which uses Intel processors. Additionally, the design aesthetics may vary, with newer models incorporating thinner bezels and a range of colors. Overall, the differences cater to varying user needs, preferences, and performance requirements.
dual-core processing