In terms of gaming the resolution of both laptops mean the CPU will share some of the grunt work so the i7 would most probably be the best in terms of gaming.
If the resolution was 1650x1080 (or higher) then all the graphic workload is done by the GPU. In this case it's shared between GPU and CPU.
I would personally look for a better graphics card and get a 1650x1080 or higher resolution for a laptop.
Between the two the Acer would be the way to go since if you go 1920x1080 on the Sager it would be a waste of money since the graphic card isn't powerful enough to game at that resolution.
If the resolution was 1650x1080 (or higher) then all the graphic workload is done by the GPU. In this case it's shared between GPU and CPU.
I would personally look for a better graphics card and get a 1650x1080 or higher resolution for a laptop.
Between the two the Acer would be the way to go since if you go 1920x1080 on the Sager it would be a waste of money since the graphic card isn't powerful enough to game at that resolution.