The most popular processors till 2010 were the Intel Core 2 ones, but by that time the competitive models by AMD have almost caught up with their productivity and were sold at much cheaper prices. But yet at the end of 2008, Intel designed the Core i7 processors with absolutely new architecture, but they were produces in small quantities and were very expensive.
The order of overclocking of the Intel Core i3/5/7 processors does not differ too much from overclocking of the Core 2 chips. To get good results, you must take into account the basic requirements of a new architecture: a transfer of DDR3 memory controller directly into a processor and a replace of FSB bus with a new serial bus QPI. Such principles had already been used in the AMD processors.
To set operating frequencies of processor, memory, memory modules, DDR3 controller, cache memory and QPI bus, the principle of multiplying of a basic frequency 133 MHz (BCLK) on specific ratio is used. So, the main method of processor overclocking is increasing of basic frequency, but the frequencies of all other components will also be increased. In this case you must decrease the memory multiplying ratio beforehand to ensure that the memory does not become too high after increasing of basic frequency. Adjustment multipliers for the QPI bus and DDR3 controller can be needed during the extreme overclocking, and in most cases these components will operate normally with increased frequencies.