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Pentium 4 Gets 64-bit And Another Core

Intel's 15 Most Unforgettable x86 CPUs
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In 2005, Intel improved its Pentium 4 twice. First, with the Prescott-2M, and then with Smithfield. The former was a 64-bit processor, based on the Prescott design, and the latter was a dual-core processor. They are fairly similar and have the same problems as other Pentium 4s: low instructions per cycle (IPC) throughput and difficulty in increasing the clock frequency due to current losses. These two processors, intended to limit losses while awaiting the Core 2 Duo, are not among Intel’s most highly regarded. And while the Pentium D (the commercial name of the Smithfield) does have two cores, in reality it’s an assembly of two Prescott dies in the same package.

Intel Pentium 4
Code name Prescott-2M Smithfield
Date released 2005 2005
Architecture 64 bits 64 bits
Data bus 64 bits 64 bits
Address bus 64 (actual 36) bits 64 (actual 36) bits
Maximum memory 64 GB 64 GB
L1 cache 16 KB + 12 Kµops 2 x 16 KB + 12 Kµops
L2 cache 2,048 KB 2 x 1,024 KB
Clock frequency 3–3.6 GHz 2.8–3.2 GHz
FSB 800 MHz 800 MHz
SIMD MMX, SSE, SSE2, SSE3 MMX, SSE, SSE2, SSE3
SMT/SMP Hyper-Threading dual cores (Hyper-Threading on certain models)
Fabrication process 90 nm 90 nm
Number of transistors 169 million 230 million
TDP 84-115 W 95-130 W
Voltage 1.2 V 1.2 V
Die surface area 135 mm² 206 mm²
Connector LGA775 LGA775

An interesting point is that whereas the Pentium 4 processors intended for the consumer market did not use the PAE technology (which enables 36-bit, as opposed to 32-bit memory management) and were therefore limited to 4 GB of RAM, these models can go beyond that limit. In practice, the address bus is still limited to 36 bits (40 bits on the Xeon), but PAE (management in 4 GB pages) is now ancient history—a 64-bit program is capable of making full use of the available memory.

Hyper-Threading, an Intel SMT technology, was available on certain models (Xeon and Extreme Edition). Finally, a 65 nm version (the 9x0 series) of the Pentium 4 was released later, but made no major improvements.

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  • -5 Hide
    Arkz , August 4, 2008 7:19 AM
    great article with only a few slight errors (like saying the core2duo has 1-4 cores... i don't think there's a 1 cored version lol)

    Looking forward to the AMD article.
  • 6 Hide
    aleluja , August 4, 2008 7:36 AM
    To correct you. Core 2 Duo has ONLY 2 cores, not more, not less.
    Core 2 Quad, has 4 cores and Core Solo has 1 core.
  • 3 Hide
    Anonymous , August 4, 2008 7:42 AM
    @Arkz

    Yes there is a singal core,

    http://en.wikipedia.org/wiki/List_of_Intel_Core_2_microprocessors#Single-Core_Mobile_processors

    Ok it is not under the same branding but it is part of the same microarchitecture
  • 1 Hide
    Yuka , August 4, 2008 7:45 AM
    I might be wrong, but i resemble that the Pentium 166 (32bits adress bus and all) had support for 4Gb of memory. I remember IBM sold it's top line (at that time) with 64Mb support (even with SDR PC100/66 support). Correct me if i'm wrong please.
  • -1 Hide
    neiroatopelcc , August 4, 2008 8:39 AM
    The core 2 does supply 1-4 cores - 2 cores per die, where one might be disabled, and one or two dies on a socket. It's no less right to call a core2duo a cpu with 1-4 cores, than it is to put the pentium d on the same page as a single core prescot, as it's the very same principle.
  • -1 Hide
    cangelini , August 4, 2008 9:18 AM
    Arkzgreat article with only a few slight errors (like saying the core2duo has 1-4 cores http://en.wikipedia.org/wiki/Coree ... i don't think there's a 1 cored version lol)Looking forward to the AMD article.


    Thanks for the heads-up! I tweaked that passage to better represent the Core 2 architecture's available configurations!
  • 1 Hide
    randomizer , August 4, 2008 11:03 AM
    vosesterOk it is not under the same branding but it is part of the same microarchitecture

    Exactly. The article says:

    ArticleThere are many versions of the architecture, resulting in configurations with a different number of cores


    There is no mention of the branding, so there is no actual error there, just misinterpretation.
  • 0 Hide
    ImSpartacus , August 4, 2008 11:11 AM
    Arkzgreat article with only a few slight errors (like saying the core2duo has 1-4 cores... i don't think there's a 1 cored version lol)Looking forward to the AMD article.


    http://www.newegg.com/Product/Product.aspx?Item=N82E16819116039

    Yes, it isn't called a "Core 2 Duo," but it uses the Core architecture and only has a single core enabled.

    But I will have to say, there aren't any 3 core models...
  • 4 Hide
    magicandy , August 4, 2008 11:32 AM
    Good to hear you're not only doing an AMD article, but an ATI one as well (in response to the Nvidia article you did earlier, assuming). A sign of class from the new Tom's is a welcome one.
  • 6 Hide
    harrycat88 , August 4, 2008 12:15 PM
    I wish they would get rid of those stupid SNAP Linkbubless and Inteltex misguiding links. Who ever invented those stupid annoying double lined text popups should have been burned at the stake
  • 0 Hide
    JonathanDeane , August 4, 2008 12:39 PM
    What Intelitext do you speak of ? lol (I use a good Hosts file from MVP) blocks most of that crud.

    Anyway great article was like a trip down memory lane for me, first Intel CPU I got to use was a 8086 and wow it was slow (I was a kid with ADD give me a break lol) well maybe it was not slow and it was the floppy drive that killed me... Either way best game on it was Qbasic uugghh I think I remember it having CGA with a mighty 4 colors !! I had some paint program for it too.
  • 0 Hide
    johnlove , August 4, 2008 1:13 PM
    Compared to Athlon, Pentium 4 is a big loser.
    So why is the Pentium 4 "unforgettable"?
  • 0 Hide
    Anonymous , August 4, 2008 1:38 PM
    My AMD machine (K6 233MHz) smoked all my college buddies Pentium 233s. MatLab, Visio, Quattro Pro, PSPICE, Duke Nukem - everything ran faster on my machine. And it cost me $400 less than the comparable Intel setup.
  • 0 Hide
    warezme , August 4, 2008 1:39 PM
    Just 15? I figure its anything with SX after it, anything Celeron and most of anything HT (hyperthreading heat trap)
  • 0 Hide
    warezme , August 4, 2008 1:41 PM
    oops, my dyslexia read the thing as Most Forgettable.., ignore post above. Maybe thats the next article
  • -1 Hide
    jimmysmitty , August 4, 2008 2:02 PM
    johnloveCompared to Athlon, Pentium 4 is a big loser. So why is the Pentium 4 "unforgettable"?


    Because it was a huge part of CPU history? IDK. Considering that it was not that bad until Prescott, which I am sad they didn't mention.

    But the Pentium 4 will always be remembered in my eyes thanks to the Blue Man Group. Them and their crazy stuff.

    theDagdaMy AMD machine (K6 233MHz) smoked all my college buddies Pentium 233s. MatLab, Visio, Quattro Pro, PSPICE, Duke Nukem - everything ran faster on my machine. And it cost me $400 less than the comparable Intel setup.


    Thats nice. Because this is obviously a competition.

    No wait its not. Its just a nice walk down memory lane and they are going to do AMD next so no need for that.

    I for one am suprised that they didn't include the Pentium 805. I remember reading how well that one OCed and when OCed it smoked the highest end available and it only cost $150 bucks.

    Seriously why bring AMD into this? Its just nice memories not a comparison.
  • 0 Hide
    ovaltineplease , August 4, 2008 2:41 PM
    Enjoyed the article, it was a nice walk down memory lane to my teenage nerdhood.
  • 0 Hide
    snarfies1 , August 4, 2008 2:47 PM
    jimmysmittyConsidering that it was not that bad until Prescott, which I am sad they didn't mention.


    If the best you can say about it is "that it was not that bad," that would seem to indicate it wasn't particularly worth remembering.
  • 0 Hide
    Anonymous , August 4, 2008 2:51 PM
    You forgot the 486DX5 133. Allowed me to up a 486/50 to Pentium 75 performance with just a chip. Worked well till programs started to check for a true Pentium chip before running/installing.
  • 0 Hide
    theLaminator , August 4, 2008 3:20 PM
    I've got a working luch box with a 386 in it complete with network cards, Working pentium box, a PIII box, the laptop I still use is a P4 3.0Ghz (an hour and half battery life lol), and my new rig has A core 2 duo E8400 OC'd to 4.0Ghz. Good times for me with Intel
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