Comment 72 for bug 151168

As far as I can tell, you will see this bug on any nVidia card with the nvidia-glx-new drivers, but only once you've exhausted the onboard texture memory. So I need to open a *lot* of windows on my 512Mb card before it starts leaking, but it still does. With 64mb of memory, you'll hit the limit much faster, but now instead of seeing black windows, the texture memory for that window will get added to compiz.real's memory space, and won't be released.

So, having enough more memory will greatly reduce the likelyhood that you trigger this bug, but cannot eliminate it entirely.