Sorry if this is in the wrong category.
So my question is simple, what should a game programmer who works with OpenGL and GLSL know about GPU specifications. Like what does the terms mean, e.g. Shader Clock Speed, or Texture Fill Rate, just to name a few. For some of them I have an understanding of what they are, however the values make no sense to me since I don't know how well that performs.
So, are there any resources online that explains the specs of a GPU? Covering some statistics comparing different GPUs and how their specs improve performance, etc. And also cover some aspects of the programmer side, for instance OpenGL and GLSL programming.