What is the fine-grained topic of the following text: The device has powerful CPU such as Octa core (2.84 GHz, Single core, Kryo 485 + 2.42 GHz, Tri core, Kryo 485 + 1.8 GHz, Quad core, Kryo 485), with GPU Adreno 640 is also awesome. Only return the topic.
Device CPU and GPU specifications