Intel Core 2 Quad Q6600 four-core CPU

The 2.40GHz Q6600 has 90 per cent of the clock speed of the 2.67GHz Extreme QX6700 and in a pure test of processing power such as POV-Ray the performance differential is about ten per cent.

POV-Ray Benchmark Results

3DMark 06 Benchmark Results

In a more general test, like PCMark05, the picture is far less clear as the Q6600 lags behind the QX6700 by six per cent in the CPU element of the test which equates to five per cent overall. That probably puts too much emphasis on the performance of the CPU.

PCMark 05 Benchmark Results