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kartu,
The screen is smaller but the resolution is the same, so it should be a wash.
igorsk,
Just spit-balling here, but aren't the differences in hardware interfaces that are missing? (audio, SD, memstick) Knowing that Sony built their firmwares from the same framework, it could be possible that the x50 framework was optimized for the 650's configuration. It may run slower when it doesn't have parts it's optimized for -- perhaps the briefest of pauses when notices that one of the interfaces hasn't replied recently and ponders the error.
yes, that would be a cosmetic bug in the firmware -- one that only a side-by-side comparison would reveal -- but one that's unnoticeable enough to make it through formal testing. I'm not saying this is a present bug, just saying it MIGHT.
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