Even though there are 512x512 pixel icon representations for all Apple apps, the Dock stays at 128 pixels maximum when using the Sie slider in the Dock's System Preferences panel. This old hint explains how to set the magnification level to up to 512 pixels (using the largesize key; defaults write com.apple.dock largesize -int 512).
Here's how to change the tile size (the maximum non-magnified dock icon size) to go along with the supersized zoomed icons. In Terminal, enter this command:
defaults write com.apple.dock tilesize -int 256; killall Dock
The tile size may be up to 256 pixels, so don't go any higher than that. Note that icons above 128 pixels are scaled, and you can notice some pixelation.
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Mac OS X Hints
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