Laptop for Blender/Cycles

Hi, is any chance that I can see any gain on gt540/555? (ASUS K73SV). Maybe, someone even has such a laptop and can give some tips… AFAIK gt540/555 are supported under Cycles - http://benchmark.cd3dtech.com/Benchmark/benchmark.html
At first, I need to tell you that I don’t want to buy PC, it doesn’t come into account. Thanks in advance :wink: