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8800GT
G92 Core
65 NM Manufacturing Process (produced at Taiwan Semiconductor Manufacturing Company)
324 MM Die Size

GPU Engine Specs:
CUDA Cores 112
Graphics Clock (MHz) 600 MHz
Processor Clock (MHz) 1500 MHz
Texture Fill Rate (billion/sec) 33.6

Memory Specs:
Memory Clock (MHz) 900
Standard Memory Config 512 MB
Memory Interface Width 256-bit
Memory Bandwidth (GB/sec) 57.6

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9800 GT
G92 Core
65 NM Manufacturing Process (produced at Taiwan Semiconductor Manufacturing Company)
324 MM Die Size

GPU Engine Specs:
CUDA Cores 112
Graphics Clock (MHz) 600 MHz
Processor Clock (MHz) 1500 MHz
Texture Fill Rate (billion/sec) 33.6

Memory Specs:
Memory Clock (MHz) 900
Standard Memory Config 512 MB
Memory Interface Width 256-bit
Memory Bandwidth (GB/sec) 57.6

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9800 GT (version 2)
G92b Core
55 NM Manufacturing Process (produced at Taiwan Semiconductor Manufacturing Company)
260 MM Die Size

GPU Engine Specs:
CUDA Cores 112
Graphics Clock (MHz) 600 MHz
Processor Clock (MHz) 1500 MHz
Texture Fill Rate (billion/sec) 33.6

Memory Specs:
Memory Clock (MHz) 900
Standard Memory Config 512 MB
Memory Interface Width 256-bit
Memory Bandwidth (GB/sec) 57.6

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The 8800GT is the same card as the 9800GT version 1. The only difference between the 9800GT version 1 and the 9800GT version 2 is the 9800GT version 2 had a die shrink using a newer factory so it was cheaper to manufacture.

I never understood why that Nvidia never dieshrunk the 9800GT to 40nm. If they did so it would have a similar die size as the GT430 (and thus similar cost), yet would perform much better in games. Not everyone needs direct x11 and bitstreaming audio. They would have to go with a 128 bit bus due to the width and length of the bus not allowing them to put a 256 bit bus, but they can always have a ddr3 card and a gddr5 card like they did with the 240.