See this at:
store.apple.com|
Added on 06/30/07
Your 24-inch iMac comes standard with a powerful NVIDIA 7300 GT graphics processor with 128MB of GDDR3 SDRAM dedicated graphics memory. For additional performance in 3D and graphics-intensive applications, you can upgrade to a more powerful card.
Your 24-inch iMac comes standard with a powerful NVIDIA 7300 GT graphics processor with 128MB of GDDR3 SDRAM dedicated graphics memory. For additional performance in 3D and graphics-intensive applications, you can upgrade to a more powerful card. See less 
Highlights:
2.16GHz Intel Core 2 Duo [Subtract $250]
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