Early this evening while modeling peacefully my latest big city, I have experienced FOR THE FIRST TIME some rendering errors such as weirdly stretched textures and occasionally completely black screens. This weirdness only appears in certain spots, not just everywhere I look around the model. The Fast Feedback is on, the maximum texture size is also on but it did the same thing while it was deactivated. The model itself is not laggy but it shows this kind of lines and textures all over the screen. Indeed, the model is a huge one(120MB), showing New York City with low-medium details and textures but the thing that gets on my nerves is the fact that I have ran in the past the same model on an even poorer computer, lagging hard and all, but it had no problems showing the model correctly.
Now I’m asking for your help regarding the situation. How can I solve this problem without “consider upgrading the computer”?
The Graphics card I have right now is an old dedicated AMD Radeon HD 5450 2048MB and running the latest drivers (April 2016 if I remember correctly), CPU Intel i3 3220, 3.3Ghz, 10GB of memory RAM and OS Windows 7 x64bit.