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GPU & NAND Performance
The Adreno 430 in the Snapdragon 810 is geared towards rendering to 1440p displays, and as the G Flex 2 has a 1080p display, graphics performance is very good. Let's check out some benchmarks
Compared to the HTC One M9, again with the same Adreno 430 GPU, the LG G Flex 2 holds a slim 3.7% advantage, which can be attributed to different levels of throttling and underclocking. The G Flex 2 holds a much larger advantage over the LG G3 with its Adreno 330 GPU: 61% in general GPU benchmarks, and 182% in onscreen benchmarks thanks to the lower display resolution.
The G Flex 2 does still throttle its GPU when under a sustained load, but not to the extent of the HTC One M9. Throttling does affected performance after five minutes of gaming, though overall the SoC should still be faster than the Snapdragon 801, even under heavy throttling. Also, contrary to early reports, the G Flex 2 doesn't get unusually hot under sustained load, and it's certainly less hot to touch than the One M9.
The NAND performance of the G Flex 2 is also very good, falling just short of the HTC One M9, but blowing away many other devices on the market. Clearly this is an aspect of performance that manufacturers are improving aggressively, and it wouldn't surprise me if most other flagships match the NAND performance of the G Flex 2 and One M9.