...This is, for lack of a better word, "normal" behavior. In raid and raid-like environments (densely-populated cities, Wintergrasp during peak hours, etc.,) system performance is heavily contingent on CPU and networking throughput. In these conditions, graphics performance is limited to the CPU's capacity to prepare and transmit relevant frame data to the graphics subsystem on a frame-by-frame basis; this is known as CPU bottlenecking. Increasing the effective graphics throughput (enabling SLI and/or overclocking domain frequencies) will not yield appreciable or marginal additional performance due to the GPU(s) being forced to wait of new instruction sets from the CPU. In other words, your single graphics card alone is drawing a given frame faster than the CPU can prepare the next one, and introducing additional GPUs isn't alleviating the issue but only adding to it.
Fixing the problem is a matter of increasing your processor's capabilities - that means overclocking, or a new processor if you'd rather throw money at the problem than understand it. Increasing your processor's clock speed allows it to perform more calculations per second, decreasing the time between data sets being sent to the graphics subsystem, which means more consistent performance. Do understand that World of Warcraft is a mixed bag of CPU- and GPU-limited environments, and performance gains may be more noticeable in some more than others. For example, overclocking your CPU will boost your performance in large cities and raids but likely not to the same extent in visually intensive scenes like flying in Grizzly Hills. On the other side of that, enabling SLI will boost performance in those graphics-heavy scenes but won't help in CPU-limited instances (as you now know.)
GeForce Technical Marketing
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