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What are the differences between Intel Core 2 duo, Intel core i7 and Intel centrino 2?

How much is for example 2 ghz Intel centrino in Intel Core 2 duo and Intel core i7? Which of them are best for gaming?

Intel Core 2 Duo:

Core 2 is a brand encompassing a range of Intel's consumer 64-bit x86-64 single-, dual-, and quad-core CPUs based on the Intel Core microarchitecture. The single- and dual-core models are single-die, whereas the quad-core models comprise two dies, each containing two cores, packaged in a multi-chip module.The introduction of Core 2 relegated the Pentium brand to the mid-range market, and reunified laptop and desktop CPU lines, which previously had been divided into the Pentium 4, Pentium D, and Pentium M brands.

The Core microarchitecture returned to lower clock rates and improved the usage of both available clock cycles and power when compared with the preceding NetBurst microarchitectue of the Pentium 4/D-branded CPUs.The Core microarchitecture provides more efficient decoding stages, execution units, caches, and buses, reducing the power consumption of Core 2-branded CPUs while increasing their processing capacity. Intel's CPUs have varied wildly in power consumption according to clock rate, architecture, and semiconductor process, shown in the CPU power dissipation tables.

Core-based processors do not have Hyper-Threading Technology found in Pentium 4 processors. This is because the Core microarchitecture is a descendant of the P6 microarchitecture used by Pentium Pro, Pentium II, Pentium III, and Pentium M. Core 2 also lacks an L3 Cache found in the Gallatin core of the Pentium 4 Extreme Edition, although an L3 Cache is present in high-end versions of Core-based Xeons and Hyper-Threading is present on select Atom processors. Both an L3 cache and Hyper-threading is present in current Nehalem and future Westmere processors.

The Core 2 brand was introduced on July 27, 2006, comprising the Solo (single-core), Duo (dual-core), Quad (quad-core), and in 2007, the Extreme (dual- or quad-core CPUs for enthusiasts) version. Intel Core 2 processors with vPro technology (designed for businesses) include the dual-core and quad-core branches.

Intel Core i7 :

Intel Core i7 is a family of several Intel desktop and laptop 64-bit x86-64 processors, the first processors released using the Intel Nehalem microarchitecture and the successor to the Intel Core 2 family.The Core i7 identifier applies to the initial family of processors codenamed Bloomfield introduced in 2008 and the 2009 Lynnfield and Clarksfield models. All current models are quad-core processors, but the upcoming Core i7-6xx "Arrandale" mobile processors only have two cores.

Intel representatives state that the moniker Core i7 is meant to help consumers decide which processor to purchase as the newer Nehalem-based products are released in the future. The name continues the use of the Intel Core brand. Core i7, first assembled in Costa Rica, was officially launched on November 17, 2008 and is manufactured in Arizona, New Mexico and Oregon, though the Oregon (PTD, Fab D1D) plant has already moved to the next generation 32 nm process.

Intel Centrino 2 :
Centrino 2 has a smorgasbord of new features that we can expect to grace every laptop for at least another 12 months, if tradition is any indication. It's arguably the most comprehensive list of features we've seen on a laptop platform yet, complete with six new Intel Core 2 Duo processors, a faster (1,066-MHz) front-side bus (FSB), two new wireless cards, support for DDR3 memory, and a new Gigabit controller. And that doesn't even begin to paint the whole picture.

As if the proliferation and naming of processor models wasn't confusing enough, Intel has added a "P" designation to the line. The 2.53-GHz Intel Core 2 Duo P9500, the 2.4-GHz P8600, and the 2.26-GHz P8400 join the family as the first 25-watt processors, promoting energy efficiency while maintaining standard voltage speeds. The other half of the batch consists of Core 2 Duos with a higher thermal design power (TDP)—the 2.8-GHz T9600 and the 2.53-GHz T9400 are rated at 35W, while the 3.06-GHz Extreme X9100 is rated at 44W. The T-Series and X-Series processors are consistent with past models in which higher TDPs typically favor power and speed over battery life improvements. Especially important is that all of the new processors will operate on the new 1,066-MHz FSB. Although only regular-voltage processors were announced today, expect ultra-low-voltage (ULV) and low-voltage (LV) processors to trickle in later this year.

For Gaming Intel Core i7 Is the best.