The chip giant launched 64-bit P4s in August 2004, at 3.2, 3.4 and 3.6GHz. Boxed, retail-oriented versions of the chips turned up in January this year, along with a 3.8GHz part.
By then, Intel had released version based on the updated 'E' core to complement the original 'D' core releases. Version-E parts have an 'F' appended to their clock speed to indicate the use of the more up-to-date core.
This week's end-of-life announcement touches on both D- and E-core parts. Intel will take orders up until 26 August, with the last orders being fulfilled by 25 November.
Intel claims that market demand for chips that support Intel EM64T has shifted to higher performance Intel processors, and has cites this as the reason for the discontinuations. Intel plans to launch replacement processors that will add support for Intel's Virtualisation Technology (VT).