Bclk is your base clock or your fsb (front side bus). The meaning of the term fsb is less accurate now that various bus functions are integrated in the CPU core/uncore nowadays.
The bus speed is multiplied by your CPU multiplier for your clock speed. So a 133MHz bus with a 20x multiplier runs at 2.67GHz.
Basically, your bios will let probably let you adjust a clock though--which will be 133, 200, or 266 depending on your CPU, I think it'll start at 133 for yours. It should be able to go to 160 or so without voltage increases. Your multiplier will be locked since it's not a K or X series CPU.