I have an hold GTX 650 with 2GB VRAM. I have a mod that increases the amount of trees, grass etc on a town. I have noticed that this dropped my frame rates from a solid 75 to crawling around 15. However, when I have rivatuner on, in order to see the usage, the usage stays very low, we are talking about 41-50%. This made me conclude that the texture for the grasses are too much for the graphics card to hold in it's 2GB vram? If it was the case that the 650 was near 100% load I would assume that it is struggling to out as many frames. Or is it simply that the mod was un-optimized some how?