For many consumers shopping around for a new desktop or laptop PC, one of the biggest considerations is the type of processor, and the two most often in contention are the Intel Core i5 and Core i7. Discounting Core i3 (mainly found in budget systems) and AMD processors (another article entirely), the difference between Intel Core i5 and Core i7 can seem daunting, especially when the prices seem so close together once they're in completed systems. We break down the differences for you.
Price and Marketing
Simply put, Core i5-equipped systems will be less expensive than Core i7-equipped systems. Intel has moved away from the star ratings it used with previous-generation Core processors in favor of a capability-driven marketing message. Essentially, the Core i7 processors have more capabilities than Core i3 and Core i5 CPUs. Core i7 will be better for multi-tasking, multimedia tasks, high end gaming, and scientific work. Core i7 processors are certainly aimed at people who complain that their current system is "too slow." Spot-checking a system like the midrange Dell XPS 8500 desktop, you'll find the Core i5 about $150 less expensive than a similarly equipped Core i7 system.
Core Confusion
For the most part, you'll get faster CPU performance from Core i7 parts than Core i5. The majority of desktop Core i7 CPUs are quad-core processors, while many mobile Core i5 processors are dual-core. This is not always the case, as there are mobile dual-core Core i7 processors, and likewise several desktop quad-core Core i5 processors. Then of course you'll see the rare six-core Core i7, which are usually found with the desktop-only Extreme Edition top-of-the-line models.
The Core nomenclature has been used for several generations of CPUs. Nehalem and Westmere use three-digit model names (i.e. Core i7-920), while Sandy Bridge and Ivy Bridge CPUs use four-digit model names (Core i7-2600). Thankfully, unless you're shopping the used PC market, you'll find Sandy Bridge processors in closeout systems and budget PCs while you'll find Ivy Bridge processors in most new PCs. The essential takeaway is that to get better performance in each generation, buy a processor with a higher model number (e.g., a Core i7-3770 generally has better performance than a Core i5-3450).
