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You are misunderstanding. By underclocking the CPU there are less cpu cycles per vertical refresh. Thus the game can appear to run faster if it isn't really pushing the CPU as all those extra cycles wasting time don't happen. But, if a game was really pushing the CPU, underclocking would more than likely have little to no effect in increasing speed.
If you overclock the CPU, if the CPU normally couldn't handle things fast enough, it may be able to then. If you try Metal Slug for NeoGeo, you'll notice at the default setting there is significant slowdown. Overclock the CPU (which means it takes MORE power to emulate fast) and the game no longer has those slowdowns.
The thing is, with Dreamcast, have you ever really noticed a game with slowdown? I haven't. However for those with lesser CPUs underclocking can be very nice.
For my situation I don't believe the CPU is holding me back, I think it's my video card.
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