Tom's Hardware Performance Index
When we look back and let the performance benchmarks sink in, and then reevaluate the introduction and the issue of micro-stuttering, a large number of entries in the above charts become theoretical results. They don't offer practical value because those solid benchmark numbers are often saddled by the effects of micro-stuttering, which aren't detectable via average frame rates.
Three- and four-way CrossFire-based setups can rightfully claim their spots in these charts by offering sheer performance and minimal micro-stuttering artifacts. However, two-GPU configurations seem much more susceptible to annoying choppiness and, depending on the game you're playing, might only offer good benchmark results.