oppo is not currently developing its own processor.
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Basically, they use Qualcomm's Snapdragon, and some will use Mediatek.
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Snapdragon processor rankings: The beginning of 4 is the entry level, such as 480, the beginning of 7 is the mid-end, such as 780, and the beginning of 8 is the high-end processor, such as 888.
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There is also oppo will only use Mediatek's processor, ranking as follows: high-end Tianji 1100, mid-end Tianji 1000, low-end Tianji 800
oppo processor ranking first is fondx3pro, Snapdragon flagship 888, ranking second is findx3 Snapdragon 870, ranking third is opporeno6pro, Snapdragon 870, ranking fourth is reno5pro, Snapdragon 865, ranking fifth is reno6pro, Tianji 1200, In sixth place is the reno5pro Sky 1000