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Helps to know which card you have... Results are different over different memory types.

DDR2 & GDDR3 (not sure on GDDR5)

Memory interface / 8 * memory clock * 2

EG for my GTX275

448-bit / 8 = 56

56 * 1224MHz = 68,544MB/s

68,544MB/s * 2 = 137,088Mb/s

= 137.1GB/s

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Q: What calculate the grafic card bandwith?
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