Borderlands 3? Homeworld 3? Who chose these games? Why not just use the current top 10 on Steam atm?
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those games come with benchmark tools
It would have been chosen for the same reason ashes of the singularity was chosen as a benchmark for so long: because it looks good, it comes with a benchmark, and it's really good at stressing out a particular part of the computer (for AoS: async rendenring, for HW3: CPU).