^^ Okay top of the order, sure the Intel Sandy Bridge architecture supports upto only 1333MHz RAM, but the on-board memory controller is so effective that it has been reviewed that a 1600MHz is optimum value for money, also a Corsair XMS3 4GB module
OR G.Skill RIPJAWS 4GB module rated@1600MHz CL-9 is priced around 1700/-, while the ValueRAM sticks are ~1300/-.
AnandTech - Sandy Bridge Memory Scaling: Choosing the Best DDR3, excerpts from the same --
It makes perfect sense to plonk in 400/- quid more, get a slight increment in speed [which positively boosts the performance] + get head-spreader [that look cool too] + get same worry free warranty = peace of mind and a great deal.
Why will the H67 chipset bottle-neck a
k marked processor, Sire. The only thing that it'll not support is over-clocking. Rest all features on the H67 chipset and P67 chipset are mirror [apart form over-clocking support, Intel HD graphics and in extension Intel Quick Sync (supported by H67 / Z68 but not P67)].
This is the P67 chipset tree --
and here is the H67 chipset tree --
Hope this clarifies the confusion. Cheers!