It was a further development of the Deschutes Pentium II. The differences were the addition of execution units and SSE instruction support, and an improved L1 cache controller[ citation needed ] the L2 cache controller was left unchanged, as it would be completely redesigned for Coppermine anyway , which were responsible for the minor performance improvements over the "Deschutes" Pentium IIs. Two more versions were released: The Katmai contains 9. It is fabricated in Intel's P A notable stepping for enthusiasts was SL35D.
The second version, codenamed Coppermine Intel product code: For models that were already available with the same frequency, an "E" was appended to the model name to indicate cores using the new 0. In terms of overall performance, the Coppermine held a slight advantage over the AMD Athlons it was released against, which was reversed when AMD applied their own die shrink and added an on-die L2 cache to the Athlon.
Athlon held the advantage in floating-point intensive code, while the Coppermine could perform better when SSE optimizations were used, but in practical terms there was little difference in how the two chips performed, clock-for-clock. However, AMD were able to clock the Athlon higher, reaching speeds of 1. It is eight-way set-associative and is accessed via a Double Quad Word Wide bit bus, four times as wide as Katmai's.
Furthermore, latency was dropped to a quarter compared to Katmai. Another marketing term by Intel was Advanced System Buffering, which encompassed improvements to better take advantage of a MHz system bus. These include 6 fill buffers vs. Although its codename gives the impression that it used copper interconnects , its interconnects were in fact aluminium.
This in itself did not improve thermal conductivity, since it added another layer of metal and thermal paste between the die and the heatsink, but it greatly assisted in holding the heatsink flat against the die.
Earlier Coppermines without the IHS made heatsink mounting challenging. Some heatsink manufacturers began providing pads on their products, similar to what AMD did with the "Thunderbird" Athlon to ensure that the heatsink was mounted flatly. The enthusiast community went so far as to create shims to assist in maintaining a flat interface.
The Coppermine core was unable to reliably reach the 1. In benchmarks that were stable, performance was shown to be sub-par, with the 1. Tom's Hardware attributed this performance deficit to relaxed tuning of the CPU and motherboard to improve stability. Intel used the latest Coppermines with the cD0-Stepping and modified them so that they worked with low voltage system bus operation at 1.
They can be distinguished from Tualatin processors by their part numbers, which include the digits: The third revision, Tualatin , was a trial for Intel's new 0. Tualatin-based Pentium IIIs were released during until early at speeds of 1. Although the Socket designation was kept, the use of 1.
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. Despite this, its appeal was limited due to the aforementioned incompatibility with existing systems, and Intel's only officially supported chipset for Tualatins except 3rd party server-line chipsets found on expensive server boards , the i, could only handle MB RAM and had slightly inferior performance because of a maximum in-order queue depth of 4, compared to 8 with the older, incompatible BX 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. 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 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 0. The Tualatin core was named after the Tualatin Valley and Tualatin River in Oregon , where Intel has large manufacturing and design facilities. This organization allows one half of a SIMD multiply and one half of an independent SIMD add to be issued together bringing the peak throughput back to four floating point operations per cycle — at least for code with an even distribution of multiplies and adds.
Programmers faced a code-scheduling dilemma: Should the SSE-code be tuned for Katmai's limited execution resources, or should it be tuned for a future processor with more resources? Katmai-specific SSE optimizations yielded the best possible performance from the Pentium III family but was suboptimal for Coppermine onwards as well as future Intel processors, such as the Pentium 4 and Core series.