Steam uploaded 51 terabits per second of data to clients worldwide at its busiest time of last night, according to its own stats page. The peak occurred about 20 minutes after the release of Cyberpunk 2077, at 1:20 AM.
Of those 51 terabits per second, by far the most went to users in North America: 22.9 terabits per second. Europe had less than half of that at 10.7Tbps and Asia was at 12.3Tbps. In comparison, the total bandwidth was around 18Tbps just before this sudden peak. Steam doesn’t let users look back beyond a week, so it’s hard to say if this is a record for the platform. At least in 2018 there was a peak of 19.6Tbps, during a PUBG update.
The game also took the record for the largest number of simultaneous players in a single player game from Terraria. That game had 486,000 players at its peak, and Cyberpunk 2077 has garnered just over a million players at the same time since its release. The overall record for most simultaneous players is in PlayerUnknown’s Battlegrounds, with 3.2 million gamers running the game simultaneously. That was according to Steamcharts in January 2018.
According to an unofficial Steam status page, the increased pressure from the release of Cyberpunk 2077 has not resulted in a malfunction of the platform. That happened to the Epic Games Store, for example, when Grand Theft Auto V was given away for free there in May.
Cyberpunk 2077 is also available on PSN, Xbox Live, GOG and Google Stadia in addition to Steam. However, the title is not out yet for the brand new console from Microsoft and Sony; a next-gen version for these consoles is coming in 2021.