Editing Pentium III (section)

==={{Anchor|Tualatin}}Tualatin===
[[File:KL Intel Pentium III Tualatin.jpg|right|thumb|180px|A 1.13 GHz FC-PGA2 ''Tualatin-256'' Intel Pentium III-T.]]
[[File:Intel@130nm@P6@Tualatin@Pentium III@SL5CG DSCx1 polysilicon microscope stitched@5x (38002693566).jpg|thumb|Tualatin die shot]]
The third revision, Tualatin (80530), was a trial for Intel's new 130&nbsp;nm process. Tualatin-based Pentium IIIs were released during 2001 until early 2002 at speeds of 1.0, 1.13, 1.2, 1.26, 1.33 and 1.4&nbsp;GHz. A basic shrink of Coppermine, no new features were added, except for added data prefetch logic similar to Pentium 4 and Athlon XP for potentially better use of the L2 cache, although its use compared to these newer CPUs is limited due to the relatively smaller FSB bandwidth (FSB was still kept at 133&nbsp;MHz).<ref name="auto">{{cite web|url=https://www.anandtech.com/show/804/2|title=Intel Pentium III 1.2GHz 0.13-micron Tualatin: The Celeron of the Future|first=Anand Lal|last=Shimpi|date=July 30, 2001|website=Anandtech|access-date=April 5, 2018}}</ref> Variants with 256 and 512&nbsp;KB L2 cache were produced, the latter being dubbed Pentium III-S; this variant was mainly intended for low-power consumption servers and also exclusively featured SMP support within the Tualatin line.

Although the Socket 370 designation was kept, the use of 1.25 AGTL signaling in place of 1.5 V AGTL+ rendered prior motherboards incompatible.<ref name="auto"/> This confusion carried over to the chipset naming, where only the B-stepping of the i815 chipset was compatible with Tualatin processors.<ref>{{cite web|url=http://www.tomshardware.com/reviews/passing-maneuver,366-3.html|title=B-Stepping With The I815/Solano - Last Passing Maneuver: Tualatin 1266 With 512 kB Versus Athlon And P4|date=September 19, 2001|website=Tom's Hardware|access-date=April 5, 2018}}</ref> A new VRM guideline was also designed by Intel, version 8.5, which required finer voltage steps and debuted load line Vcore (in place of fixed voltage regardless of current on 8.4).<ref>{{cite web|url=http://ixbtlabs.com/articles/tualatinsmp/|title=Server Tualatin CPU review|website=iXBT Labs|access-date=April 5, 2018}}</ref><ref>{{cite web|url=http://ixbtlabs.com/articles/celeron1200mhz/index.html|title=iXBT Labs Review - Tualatin based Intel Celeron 1.2 GHz for Socket 370|website=iXBT Labs|access-date=April 5, 2018}}</ref><ref>{{cite book|url=http://cdn14.21dianyuan.com/download.php?id=89124|title=VRM 8.5 DC–DC Converter Design Guidelines|date=July 2001|publisher=[[Intel]]}}</ref> Some motherboard manufacturers would mark the change with blue sockets (instead of white), and were often also backwards compatible with Coppermine CPUs.

The Tualatin also formed the basis for the highly popular Pentium III-M mobile processor, which became Intel's front-line mobile chip (the Pentium 4 drew significantly more power, and so was not well-suited for this role) for the next two years. The chip offered a good balance between power consumption and performance, thus finding a place in both performance notebooks and the "thin and light" category.

The Tualatin-based Pentium III performed well in some applications compared to the fastest Willamette-based Pentium 4, and even the Thunderbird-based Athlons. Despite this, its appeal was limited due to the aforementioned incompatibility with existing systems, and Intel's only officially supported chipset for Tualatins, the i815, could only handle 512 MB RAM as opposed to 1 GB of registered RAM with the older, incompatible [[Intel 440BX|440BX]] chipset. However, the enthusiast community found a way to run Tualatins on then-ubiquitous BX chipset based boards, although it was often a non-trivial task and required some degree of technical skills.

Tualatin-based Pentium III CPUs can usually be visually distinguished from Coppermine-based processors by the metal integrated heat-spreader (IHS) fixed on top of the package. However, the last models of Coppermine Pentium IIIs also featured the IHS — the integrated heat spreader is actually what distinguishes the FC-PGA2 package from the [[FC-PGA]] — both are for Socket 370 motherboards.<ref>Lal Shimpi, Anand. [http://www.anandtech.com/showdoc.aspx?i=1509&p=3 Intel Pentium III 1.2 GHz 0.13-micron Tualatin: The Celeron of the Future], Anandtech, July 30, 2001.</ref>

Before the addition of the heat spreader, it was sometimes difficult to install a heatsink on a Pentium III. One had to be careful not to put force on the core at an angle because doing so would cause the edges and corners of the core to crack and could destroy the CPU. It was also sometimes difficult to achieve a flat mating of the CPU and heatsink surfaces, a factor of critical importance to good heat transfer. This became increasingly challenging with the Socket 370 CPUs, compared with their [[Slot 1]] predecessors, because of the force required to mount a socket-based cooler and the narrower, 2-sided mounting mechanism (Slot 1 featured 4-point mounting). As such, and because the 130&nbsp;nm Tualatin had an even smaller core surface area than the 180&nbsp;nm Coppermine, Intel installed the metal heatspreader on Tualatin and all future desktop processors.

The Tualatin core was named after the [[Tualatin Valley]] and [[Tualatin River]] in Oregon, where Intel has large manufacturing and design facilities.