Tanner Fredrickson :
The GTX 860m is better.
Not only is AMD failing to compete at the same tier as Nvidia in the laptop/mobile market, but the 860m is actually a tier above the M265X.
There's no comparison. The 860m is by far the better card.
The AMD has GDDR5 and the NVIDIA has DDR3L. Therefore, I believe Jack and Tanner are incorrect
http
/www.pcgamer.com/how-to-buy-a-graphics-card-six-things-you-must-know-about-gpus/
What you need to pay attention to is bandwidth. While bandwidth expectations will vary depending on a graphics card's price and performance tier, always remember this: GDDR5 memory provides twice the bandwidth of DDR3 at the same clock rate. Since memory bandwidth is a significant performance bottleneck, choosing GDDR5 is a no-brainer.
Just remember this: when it comes to graphics cards, 1 GB of GDDR5 is infinitely preferable to 4 GB of DDR3.