9500GT is the NVIDIA graphics card model. GD2 is the code name for the video memory frequency. GD2=DDR2 uses second generation video memory, 533-800MHZ loan, GD3=1066-1333 third generation. The performance of the graphics card also requires FSB support from the CPU and memory modules. In other words, the best combination of the GD2 card should be the CPU front-side bus 800 and the memory bus 800. Only at the same level can its performance be exerted. If the combination is not good, it will become a bottleneck. You must have been hacked.