I installed the performance monitor for Skyrim and one thing I noticed is my VRAM size, which is displayed as 2048MB.
http://www.nexusmods.com/skyrim/mods/6491/?
Screenshot IGPU and GPU 2048MB: http://i.imgur.com/q0djCO9.png
Then I disabled the IGPU in the BIOS and it displayed as 4096MB: http://i.imgur.com/IhhDuVw.png
I don't notice any difference in fps either way playing the game (usually 40-60 outdoors and steady 60 indoors), but miss my external monitor connected to the IGPU.
It still stutters a little either way, the first time I fast move the camera in a new area. I use many high textures for landscape etc.
This is with ENB enabled.
I tried Auto/Force for the IGPU in the BIOS, both is detected as 2048MB.
With 4096MB VRAM it seems to use a maximum of 2048MB anyway?
Does the tool work properly and detects my actual setting?
Would the doubled VRAM improve anything, maybe never CTD (happens rarely).