No. Unless you want to for very small benefits.
theres also rumers of 2400-2800mhz ram becoming the norm with z77/ivybridge when they are released which will be any week now
If you look at the motherboards currently available then typically they support up to 2400MHz.
I suppose the question is if faster RAM will only produce small overall performance gains as it does with Sandy Bridge.
thats true but its hard to reach 2400mhz with a z68/sandybridge cpu where as a z68 or z77 motherboard/ivybridge cpu combo would reach 2800mhz ram speeds more easily
Mainly for less power consumption and more cooler temp pc, well from what I read anyways.
Yea, the Ivy bridge CPU will use less power and dump less heat into your case.
However, the difference isn't too great. First the thermal design power (TDP) of the Ivy Bridge Quad cores is 77W, for the sandy bridge quads this figure is 90W (so Ivy bridge is rated at 13W less).
This anadtech test shows that at full load the ivy i7 uses 27W less than the sandy i7, however at idle the difference was only 2W.
This 27W figure, does sound good, but if you put it in the context of your 7950 graphics card that can use up to 200W at full load then this saving on CPU power and heat isn't huge (for a big financial cost).