Ram is currently and shall for the forseeable future be the bottleneck of the 865\875 chipset... So for you to say faster ram is a waste of money boarders on idiocy. CorsairPC4000 is capable of running at 520mhz... or a 260mhz FSB, as stated in multiple reviews. This boosts your FSB from 800mhz to over 1000mhz, while taking your Processor from 200x (your multiplier, 14 for a 2.8) = 2800 mhz to 260x14= 3640mhz. With good cooling, that is feasible. And you're maintaining the all important 1:1 ratio, which keeps intel Performance Acceleration Technology enabled. This is known to proved between a 5-15% performance boost.
The point is PC4000 allows you to hit high overclocks AND maintain 1:1... up until now, it's been one or the other.