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This is where the webcams leave the DSLRs for dead. You aren't stacking 3 or 4 images you are stacking 3 or 4 hundred images, often in each colour channel. Stacking multiple images reduces noise increadibly.
Your noise will reduce by the square root of the numer of frames you are stacking. So if you stack 2 frames noise will be reduced by the square root of 2. If you stack 100 frames your noise will be reduced by 10. If you stack 1000 frames you noise will be reduced by 33.3. This is why webcams have it over DSLRs. It's not the quality of the chip that counts in this case (though it is important) it's the number of images you stack.
Also if you have a large chip you will get a correspondingly small image compared to a small chip, for a given pixel size.
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