I believe the 860M will be better based on this website - http://www.notebookcheck.net/Mobile-Graphics-Cards-Benchmark-List.844.0.html
Even though they havent benchmarked the m275, it should have less performance than the 860. The 860 almost matches the 7970m in performance, which has the same amount of shaderse as the m290x
I believe the 860M will be better based on this website - http://www.notebookcheck.net/Mobile-Graphics-Cards-Benchmark-List.844.0.html
Even though they havent benchmarked the m275, it should have less performance than the 860. The 860 almost matches the 7970m in performance, which has the same amount of shaderse as the m290x