if your 6200 uses the same chip as the one i used to have then there are no extra pipelines or vertex shaders available. i had the same problem, if i applied the tiniest overclock with coolbits the pc would freeze. the solution, bios flashing. i posted a little guide a few weeks ago, ill hunt it down when i get home. it solved my problem and let me OC it about 60% with a little extra air cooling