The differences between Samsung's Galaxy Tab S7 and S8 are as follows:
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1. Size and weight: The Galaxy Tab S8 is 28g lighter than the Galaxy Tab S7 and slightly thinner.
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2. Screen: The Galaxy Tab S8 has a higher screen resolution of 2560 x 1600 pixels, compared to the Galaxy Tab S7's 2560 x 1440 pixels.
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3. Processor: The Galaxy Tab S8 has a faster Snapdragon 865 Plus processor, while the Galaxy Tab S7 has a Snapdragon 865 processor.
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4. Memory and storage: The Galaxy Tab S8 offers more memory options, up to 8GB, compared to 6GB for the Galaxy Tab S7. In addition, the Galaxy Tab S8 also has higher storage, up to 256GB, compared to 128GB for the Galaxy Tab S7.
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5. Battery life: The Galaxy Tab S8 has a slightly larger battery capacity of 8,000 mah, while the Galaxy Tab S7 has a battery capacity of 7,040 mah.
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Overall, the Galaxy Tab S8 has better performance and features than the updated version of the Galaxy Tab S7, but the price is relatively higher.