What is the max overclocking limit for an MSI NXFX 5200 (Nvida GeForce FX 5200)? It's an AGP card which is running at stock speeds (2D Core Clock: 250MHz, 3D Core Clock: 250MHz, and the Memory Clock: 400MHz). I don't know how to find the temp.-is there software to find the temp? and what temp. range is safe?