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Activating Hyper-Threading on all Pentium 4 is impossible

Activating Hyper-Threading on all Pentium 4 is impossible

With the introduction of the 3.06 GHz Pentium 4 with Hyper-Threading (HT), voices were heard for the first time that were of the opinion that every Pentium 4 that has been delivered to date has this technology and that HT only needs to be activated. So far there has only been one success report, but it is to be doubted.

It is true that, as already described in our Hyper-Threading Basics , every Pentium 4 has has the additions necessary for HT, but it can be assumed that all attempts to activate HT on old processors will fail.

Because, as with all Pentium 4 processors, the multiplier is permanently burned into a small chip in the processor production will also determine whether this small chip will allow the processor HT capabilities or not. Only when the multiplier lock is successfully removed will it be possible to activate HT on the first Pentium 4 processors and this is a hopeless undertaking

But how did one person manage to activate HT on a 2.4 GHz Pentium 4 processor? Nuja, in order to prepare the motherboard manufacturers for HT, Intel has delivered these test samples with active Hyper-Threading. However, these were not yet operated at 3.06 GHz, as the first official Pentium 4 with HT does. Rather, they came with a processor clock of 2.4 GHz. Most likely, the success reports of the subsequent activation on a 2.4 GHz Pentium 4 can be traced back to precisely this fact. Removing or isolating a processor pin has not yet led to the desired success. In the worst case scenario, this will destroy the entire processor. So stay away!