It does give a lot of performance boost, and yes other manufacturers offer it. It's the PAT function of the i875 chipset. Up the ram volts to use it, mine runs up to ~230ish street racer @ 2-2-2-5 (or 2-2-5-2, forget where the 5 is

) on my Max-3 but my vtt tracking is bugged and I can't get it stable much higher.
If you don't have double-sided sticks of ram, then turn on CPC if at all possible. This DRASTICALLY improves performance, but it doesn't work on most double sided ram (i.e. 512mb+ sticks). If you can get it to run, even at a lower fsb, it is worth it. A 30+ fsb increase is needed to offset the loss of performance turning CPC off. tRAD helps as well, and is less stressful.
I've ran F1 at 220 or so before but it barely improves performance. Street racer is the fastest for me. (gotta love ~4800 sandra unbuffered

)