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Thread: Pentium 4 CPUs

  1. #1
    bk T
    Guest

    Default Pentium 4 CPUs

    1. P4 2.8E Prescott 533 1M L2 Cache
    2. P4 2.8C 478 800 FSB Northwood

    Which of the above is better in terms of performance and "value for money"?

    Cheers

  2. #2
    drcspy
    Guest

    Default Re: Pentium 4 CPUs

    well that depends......if you have a 533Mhz board then the 800Mhz processor is gonna be wasted in a bottleneck .....if you have a 800Mhz board then the 533 cpu wont be taking full advantage of the rest of the system........

  3. #3
    Pete O\'Neil
    Guest

    Default Re: Pentium 4 CPUs

    Do they even make a 533MHZ FSB 2.8GHz Prescott P4? I know they made a 2.4Ghz Prescott with a 533ZMHz FSB, damm good overclocker aswell. If they do make a 2.8Ghz chip with a 533MHz FSB it too could be a good overclocker.

    Assuming both those chips are socket 478 then the Northwood would easily out preform the Prescott (assuming you have a modern motherboard capable of running the FSB @ 800MHz and ram capable of 200MHz). There should be much difference in price. Although the Northwood might be a bit hard to find now.

  4. #4
    Steve_L
    Guest

    Default Re: Pentium 4 CPUs

    Try this link, it compares all CPUs.

    http://cpuscorecard.com/

  5. #5
    Steve_L
    Guest

    Default Re: Pentium 4 CPUs

    Correction ... If not "all" CPUs then at least most or many.

  6. #6
    Pete O\'Neil
    Guest

    Default Re: Pentium 4 CPUs

    that link is kinda irrelevant as it makes no differentiation between the different cores.

    Due to the Prescotts longer pipeline its doesnt preform aswell as the Northwood at the clockspeed. (there are some exceptions to this rule e.g Skt775 and the latest ATI chipset for the P4). The aboves chips lack of FSB will also cripple it. It has been shown through benchmarking that the P4 continues to benefit from an increased FSB until around 1066MHz.

  7. #7
    Steve_L
    Guest

    Default Re: Pentium 4 CPUs

    >>no differentiation between the different cores.

    Pete, could you explain what is meant by 'different cores'? Thanks.

  8. #8
    andrew93
    Guest

    Default Re: Pentium 4 CPUs

    > Assuming both those chips are socket 478 then the
    > Northwood would easily out preform the Prescott
    > (assuming you have a modern motherboard capable of
    > running the FSB @ 800MHz and ram capable of 200MHz).

    Is the 200MHz RAM correct? I though you would maximise the potential of the PC (with the 800MHz FSB processor) by using 400MHz RAM (e.g. PC3200 DDR400). Was this a typo Pete or am I mis-interpreting your numbers?

  9. #9
    Pete O\'Neil
    Guest

    Default Re: Pentium 4 CPUs

    Over the lifetime of the Pentium 4 it has had several different cores. The first being the Willemette, followed by the Northwood, now we're seeing the Prescott, and there also the core used in the Extreme Edtions (cant remember the cores name but its just a rebadged Xeon). Each core offers differing preformance and in theory the newer cores should out preform the older cores. Now this is where things start to get tricky, as chipset and ram affect preformance.

    The original Willemette core, originally used RAMBUS ram, and later SD-RAM, RAMBUS had **** loads of bandwidth and didnt bottleneck the CPU what so ever. SD-RAM was a budget solution and really held the P4 back meaning it didnt preform very well. One of the biggest problems with teh Willemette core was that at the same clock speed it was out preformed by the P3. This mean there was little insentive for P3 users to upgrade, there was little preformance gain and the cost of RAMBUS was crazy. As the P4 began to scale it evenually showed imporements over the stagnent P3.

    Intel next released the the Northwood core if i remember correctly the lvl2 cache was increased to 512kb and the FSB was eventually increased to 533MHz. At this point Intel adobted DDR(pioneered by its arch nemsis AMD muhahaha), offer a cheaper alternative to RAMBUS. A northwood @ 2.8Ghz would out preform a willemette @ 2.8Ghz based on the the increased lvl2 cache and FSB(assuming they were using the same ram). The northwood also benefitted from core tweaks (note the pipeline stayed the same). It was at this stage the P4 finally started to show its hand easily scaling past the fastest Athlon. Withen the last 6months the FSB of the Northwood was scaled to 800MHz once again increasing the preformance of the P4 e.g a 2.8Ghz 533mhz FSB was slower than a 2.8Ghz 800MHz FSB.

    Just recently Intel released the Prescott core, and this is where things get interesting. Intel increased the lvl2 cache and kept the FSB the same so in theory the Prescott should out preform a Northwood. But there was one funemental change that meant this wasnt the case, Intel increase teh P4's pipeline from 20 stages to 31. The shorter the pipeline the quicker the CPU is at a given Clock speed. Only problem is a shorter pipeline affects scalabilty e.g clock speed. This is the primary reason why AMD isnt able to match Intel clock for clock. (AMD choose to have a lower overall clock speed to be more effective at the given clock speed). When Intel released the prescott it was widely accepted amongest conspiracy theorists that it was released early due to the success of the AMD64. Just before this point Dual Channel DDR was introduced and Intel finally had a cost effective answer to RAMBUS that didnt lack in preformance. This meant that the chipsets on the market (865 & 875)at the time were never designed to run a Prescott. This meant that when it was released the Prescott was slower than a northwood at a given clockspeed even though on paper it looked more appealing. E.g a 2.8Ghz Northwood outpreformed a 2.8Ghz Prescott.

    Once again things have now changed and with the arrival on Intels new chipsets and socket the Prescott is now faster than the Northwood, but only if your buying a Socket 775 chip, which isnt the case.

    Now i seem to have gone overboard but hopefully ive shown that there are difference between the different cores. Thus the above website that doesnt differenciant between core is a waste of time as the above CPU are both of the same clock speed.

    This repsonce probably has heaps of grammer errors, but since its 5pm and i want to go home it'll have to do. The likes of Whetu and Melta will probably find a few errors but on a whole it should be pretty accurate. Not bad for a AMD fanboy aye?

  10. #10
    andrew93
    Guest

    Default Re: Pentium 4 CPUs

    very informative - thanks Pete

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