2133Mhz was the highest divider that allowed me to boot with the Corsair GTX2 Hyper kit at 1.67Vdimm. I had to loosen TRCD to 8 to get the ram kit Superpi 32M stable ( all the other tests ran fine with 7 setting ) The next divider 2400 was a no boot, not even with the loosest timings on the rams... Let's go on with the show :

SuperPi 1m and Wprime32 are almost identical to the lower 1866 divider. We need more raw CPU power to get better scores. But that's not the intention of this particular test. 

SuperPi 32M benefits nicely from the extra bandwidth provided. Over 4 secs compared to the  1866 ram divider. So it is crystal clear that those that want maximum performance clock for clock, high speed rams is the way to go ! And if you can or ya wallet allows it, opt for tight timings too !

AIDA64 shows that Copy, Read and Write still manage to increase with the 2133 divider. And it's all so easy to setup. With my 2500K ES sample I did not have to increase the VCSSA voltage. Some other claimed they needed to up VSCCA voltage a bit to get 2133 stable. Tighter timings still boost even further...

Tighter timings almost have got zero benefit for the HD file encoding X264HD test. We already saw sort of a limit being reached with the previous 1866 divider test.

PCMark05 however does gain a mind blowing 250 points (sorry bit of sarcasm involved).

With Cinebench we ran into a few discrepancies at these speeds. Cas8-9 results very very close to 1866. Cas 7 was faster in the single core test at 2133, though multi core was time after time faster at 1866Mhz.

Our two futuremark 3D tests, still continue to improve with more ram speed. 3dmark06 is barely improving (GPU limited with the GTX 285) , but hey every gain counts. 3DMark01 tops at 59.6K. Compared to the slowest 1333mhz setting almost 2000 points gain.

Ubisoft's Far Cry 2 continues to impress me. Give it more CPU, more bandwidth and it still continues to pump out more FPS. Of Course we are running only at 1280 x 1024, albe it  with very high detail setting selected. Adding more AA, higher resolutions will put a damper on our joy, as the frames will stabilise sooner and the GPU will turn into the bottleneck. Mafia II finally reaches scores over 127FPS.