While rumors said it would be Mediatek's Helio X25, vivo has now confirmed that its upcoming X7 smartphone will be powered by Qualcomm's Snapdragon 652 chipset instead. The confirmation came in the form of an official teaser that says MSM8976, which is nothing but SD652 SoC.
RAM and internal memory have also been officially confirmed (4GB and 64GB), and are inline with the recent rumors. Finally, the teaser also mentions wisdom engine (version 2.0), something which reportedly makes sure that the CPU and memory performance doesn't drop.
In case you missed, previous teasers have already confirmed a front fingerprint sensor as well as 16MP front camera for the X7.