|XFX produced at least 6 different HD 4650 1GB DDR2 PCIe cards & all run the GPU core at 600MHz except one - that one runs at 650MHz. And all run the memory at 500MHz (1000MHz DDR) except for one - that one runs at 400MHz (800MHz DDR).|
Here comes the negativity - the HD 4650 is a decent lower end gaming card but you should have gotten the GDDR3/DDR3 version, not DDR2. The DDR3 version runs the memory at 650-700MHz (1300-1400MHz DDR), depending on the manufacturer. If you look at the Graphics Hierarchy Chart at Tom's Hardware, there's a 3 tier difference between the 2 versions, that's fairly significant. How about reflashing to the original BIOS, selling the card, then buying something with a little more balls?
Anyhow, why are you flashing the BIOS to overclock when you can use an overclock program such as ATITool, AMD GPU Tool, or Sapphire TriXX??
BTW, how do you break RAM?