Recently I purchased a Toshiba L675-S7108 laptop with shared Graphic memory 64MB~1696MB with 4GB RAM (DDR3 1066MHz).
If I increase the RAM up to 8GB, will the graphics also be improved while gaming? I would like to put in 2x4GB RAM.
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No, but it wouldn't matter if it did, there's more to GPU performance than just how much VRAM it has. Much like how much RAM your PC has doesn't affect CPU speed, how much VRAM is available to your GPU doesn't affect how fast it can process graphics - and unfortunately the
Mobile Intel® HD Graphics chip in your laptop is not a gaming chip by any stretch of the imagination, and will struggle to run most graphically intensive applications.
This is a very hard one.
If you have the ability to select the amount of memory that the graphics on the laptop uses, selecting somewhere around the 512MB mark should increase performance in most games/graphically intensive applications.... Not a lot, but it should be able to do a little more before showing the strain.
If the amount of memory you have for graphics is linked directly to the amount of memory, then you will have to insert more (Make sure your laptop supports above 4GB first).
Having more memory is always better!
The Intel HD Graphics 3000M aren't very powerful. At the resolutions and detail settings you'll be able to playably run games at, it won't use much video memory.
You are unlikely to see noticeable performance gains by adding more memory. The Intel graphics are very unlikely to use more than 256MB while gaming, and the remaining availible system memory is more than enough for all the games it'll be able to run.
Basically, the Intel graphics processing speed is the bottleneck while gaming, not how much memory is availible. Adding more memory isn't going to have a significant effect.