Ummm, Speedstep isn't enabled there, look at his Bclk in CPU-Z...
Speedstep lowers the CPU multiplier, not the base clock (Bus Speed in CPU-Z)
Your O/C has more than likely failed, and your BIOS has went back to optimized defaults as a result...
Speedstep isn't a bad thing, it is actually best to leave it on when overclocking IMO, as it only lowers the multi (to 12x) when the system is idle, as soon as you put a load on it will go right back up to your overclocked frequency...
However if you want to turn it off you need to disable EIST and C1e in your BIOS, or at least this is how it is on my Gigabyte X58 UD5 mobos, on other X58 boards it maybe a different name in the BIOS...