Overclocking has become increasingly difficult ever since Sandy Bridge and it is made a bit more difficult with Ivy Bridge mainly because it runs  hotter because Intel decided to use a substandard thermal paste instead of fluxless solder. This could very well change with Intels Haswell platform. As reported by Anton Shilov of XBit Labs, Intel will offer more overclocking flexibility with the new platform, and here's why.

Most of the flexibility with come with the variable base clock ratios which is currently available in Sandy Bridge-E HEDT only. Sandy Bridge and Ivy Bridge allows adjustment of the base clock (which is 100 at stock) but as its linked with other clocks (I/O, PCI Express) within the PC; increasing it usually causes errors or degraded performance but Sandy Bridge-E comes with three base clock options (100, 125 and 166 MHz) which let the users adjust them without disturbing the other clocks.

Haswell is also expected to have higher core ratios than the Ivy Bridge which will help extreme overclockers in setting the world records with LN2 and other extreme cooling systems.

Intel Increases Overclocking Potential in Haswell Processors