The maximum GSB frequency when the CPU could work stably without raising the Vcore equaled 268MHz. In other words, at the nominal core voltage this processor could work at the frequency slightly higher than the nominal: 3.75GHz. the increase in Preselr’s Vcore pushes its overclocking potential up enormously. So, all our further experiments were conducted with the processor Vcore increased to 1.45V. We could actually raise the Vcore even more in order to obtain more impressive results, however, we couldn’t risk losing the CPU, so we didn’t go any further. Especially, since we did not have any statistics about the safe operation of Pentium D with the greatly increased Vcore. However, even with this modest Vcore increase we could significantly improve our overclocking results. The CPU worked stably at up to 280MHz FSB frequencies yielding 1121.8Mhz bus speed.
So, the Pentium D 920 test sample overclocked by about 40% above the nominal and ran stably at 3.92MHz. Of course, this is not the world’s record, but it is quite a good result, anyway. At least this value is a way higher than the nominal clock frequency of the top Pentium D processors, which is very pleasing already.