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Both are same, except the GPU part, Snapdragon MSM8255 which uses Adreno 205 GPU ( Adreno is a rebranded AMD Z430 originally developed by ATi as Imageon then AMD sold it to Qualcomm )... Hummingbird in the other hand uses the PowerVR SGX 540 GPU from Imagination Technologies...
from performance POV, PowerVR SGX 540 is a little bit faster than Adreno 205 ( over all performance, in some benchmarks the SGX 540 is notable faster like in GLBenchmark 2.0 ), but the CPU part of the hummingbird limit it's power, the same GPU when used in a dual core SOC like OMAP 4430 ( used in LG Optimus 3D ) performs better... just to note, Samsung used another SOC in Galaxy S2 that SOC uses a different GPU named Mali-400MP which is slower than SGX 540... but being a dual-core helps the Mali-400MP to be faster than SGX 540...
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