Here is the deal, I ordered a CPU from a Chinese seller on Ebay. It is an used Pentium 4 670 processor. However, it is unlocked. Is this normal for this processor? I ask this because I had to change the multiplier manually. Could this be a ES CPU?
If it is "Unlocked" as in in has open mulitpliers from 14x to 19x, then no, it's not an engineering sample. That would be typical of a 6x0 Prescott cpu, as Intel added a speedstep function to the 6x0 series to help cope with heat output.
Now, if the CPU has unlocked multipliers higher than 19x (or lower than 14x) than yes, it is most likely an engineering sample. Other things that engineering sample CPUs have is a "Q-spec" instead of an "S-spec" number on the CPU, as well as the word "Intel Confidential" on the IHS. The IHS could also be completely blank (I've seen it both ways).