If two devices downloading at the same time it mean it will split into two halves speed eg: 465Mbps each
Effectively, yes. This is due to TCP's congestion avoidance algorithm; each TCP stream will back off roughly by the same amount, so with N concurrent streams each will use about 1/Nth of the total capacity.
That's why if someone is downloading a big Xbox game on your network, and you run a speed test, your speed test will show lower than maximum speed. You are competing with the download.
Exactly what speed you see depends on how many TCP streams the Xbox download is using, versus how many TCP streams the speed test is using.
(Aside: protocols like bittorrent which run over UDP don't use the TCP congestion avoidance algorithm, so can easily consume all the bandwidth and with nothing left over)



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