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I'm an occasional gamer and the GTX 960m that I have on my laptop works pretty good for the most of the games I play, but I was wondering if it is possible to devote part of the RAM to it in order to obtain more memory because 2GB aren't enough for some games.

I know that there is the possibility of devoting RAM to integrated video cards on desktops through the bios but this is isn't my case so I hope you will give me some good advice.

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The GTX card cannot use your RAM, and it would not help in any case since it is too slow - your DDR3 system RAM is not as fast as the GDDR5 in your GPU and it will also add latency.

Nvidia supports SLI defined as :

Upgrade your rig with a second NVIDIA GeForce GTX GPU to enable SLI, the system turbocharger of choice for gamers, which enables everyone’s favorite titles to be played at the highest screen resolutions with every setting maxed out. NVIDIA SLI supports the use of up to 4 GPUs, and thanks to FCAT, SLI is certified by independent press as fast, smooth and responsive.

SLI will work by sharing frames among the two GPUs, one rendering the odd frames while the other does the even frames.

However, buying a second GTX just for using SLI, with no guarantee that it will really work on your computer, seems like a bad idea to me.

I would rather advise you to buy a new and better GPU. The GTX 1070 is a wonderful card that will take on any and all video games. Just verify first the power requirements of this beastie in view of your PSU, as well as your available motherboard power connectors.

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Windows is already using system RAM as addition RAM for GPU. Check ProcessExplorer/ProcessHacker, open system properties and in the GPU entry you see the dedicated RAM (RAM on the GPU) and the max usable RAM from your System as shared:

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My AMD Radeon HD 7730M has 2GB RAM and the 9.61 GB is the RAM that the graphics card driver is using to store resources in system memory.

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