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According to id Software, this threaded renderer will shine on systems with more than two cores, so really just quad-core and octal-core systems (for now).
You misunderstood what the guy from Id was saying. The threaded renderer does give a performance increase on dual core systems but it was expected to give a greater increase on 4+ cores. This is shown in the results of numerous benchmarks of the window$ 1.2 client and in my own benchmarks of the 1.4 Linux client. If you have a dual core system and you aren't seeing a noticeable improvement then you weren't CPU limited to begin with. That's why people with high end c2d and c2q systems aren't seeing much of an increase.