Prescott-256 Celeron D processors, initially launched 25 June 2004,[22] featuring double the L1 cache (16 KB) and L2 cache (256 KB) as compared to the previous Willamette and Northwood desktop Celerons, by virtue of being based on the Prescott Pentium 4 core.[23]
It also features a 533 MT/s bus and SSE3, and a 3xx model number (compared to 5xx for Pentium 4s and 7xx for Pentium Ms). The Prescott-256 Celeron D was manufactured for Socket 478 and LGA 775, with 3x0 and 3x5 designations from 310 through to 355 at clock speeds of 2.13 GHz to 3.33 GHz.
The Intel Celeron D processor works with the Intel 845 and 865 chipset families. The D suffix actually has no official designation, and does not indicate that these models are dual-core. It is used simply to distinguish this line of Celeron from the previous, lower performing Northwood and Willamette series, and also from the mobile series, the Celeron M (which also uses 3xx model numbers).[24] Unlike the Pentium D, the Celeron D is not a dual core processor.
The Celeron D was a major performance improvement over previous NetBurst-based Celerons. A test using a variety of applications, run by Derek Wilson at Anandtech.com, showed that the new Celeron D architecture alone offered up performance improvements on average of >10% over a Northwood Celeron when both CPUs were run at the same bus and clock rate.[25] This CPU also had the addition of SSE3 instructions and the higher FSB which only contributed to this already impressive gain.
Despite its many improvements, the Prescott core of the Celeron D had at least one major drawback - heat. Unlike the fairly cool-running Northwood Celeron, the Prescott-256 had a class-rated TDP of 73 W, which prompted Intel to include a more intricate copper core/aluminum finned cooler to help handle the additional heat.[26]
In mid-2005, Intel refreshed the Celeron D with Intel 64 and XD Bit (eXecute Disable) enabled. Model numbers increase by 1 over the previous generation (e.g., 330 became 331). This only applied to LGA 775 Celeron Ds. There are no Socket 478 CPUs with 64-bit or XD Bit capabilities.
In Intel's "Family/Model/Stepping" scheme, Prescott Celeron Ds and Pentium 4s are family 15, model 3 (up to stepping E0) or 4 (stepping E0 onwards), and their Intel product code is 80546 or 80547, depending on socket type.
Thanks for the advice both of you though.
