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Oh wait... i'm constantly forgetting if i'm in a i3mega or a generic ramps context. Doh.
The ramps will reboot after upload, I'm sure the i3 will too, but it's TFT is entirely separate from the mainboard in the context, so it's very likely it will not be visually apparent at all.
But if it beeps as if it's been booted or reconnecting, then chances are thats a fairly good indication too.
Looking at the console readout via something like octoprint or repatier host may also show you something relevant.