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Thread: 533 MHz FSB on X48; myth or reality?




  1. #1
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    Question 533 MHz FSB on X48; myth or reality?

    Hi,

    I've been searching the net for ways to get my X48-DS5's FSB up to 533MHz. I've read posts of people claiming they actually did it (and beyond; and this in extreme performance enhancement mode)....

    I've been trying to get my FSB running at 533MHz in order to get a ratio of 1:1 between my memory (pc-8500 1066) and my CPU but couldn't get passed 450MHz stable.

    Before I continue, let's describe the system:

    - X48-DS5 with stock heatpipe on NB/SB/Regulators but upped with MX2 thermal paste.
    - Intel E6750 Core 2 duo (2.66G) with Noctua NH12CP-SE14 heatsink (placed upside-down so fan pushed air on the NB). I am aware that this orientation is the non preffered one by Noctua but after a few reading on the subject and one actual review on the matter convinced me that there is no or very little difference between orientations of the pipes.
    - Mushkin 996599 Blackline (Frostbyte) 2x2G memory (5-5-5-15, 1066, 1.8-2.1V)
    - Sapphire Radeon 8770HD Vapor-X
    - EVGA NVidia 9800
    - Cooler Master HAF-932 (An awfully lot of air passing through)
    - Corsair PSU TX750 (750W, 80+ silver)

    I've been playing with the M.I.T. settings quite a bit to find a stable configuration. Right now, my CPU is running a bit under 3.2G with memory at 1.200G (450MHz, 7x multiplier on the CPU, 2.66D RAM multiplier).

    I've had to crank FSB voltage to +0.1; MCH to +0.1 and I also cranked the PCIEx voltage by +0.1. My CPU is sligthly over 1.38V. The system is also running in Normal enhancement performance mode (Turbo and Extreme are just destabilizing the system).

    Now I've read that in order to get passed 480MHz, they had to play with the CPU clock skew.... But passed 480; I can get to 460 (unstable) but never beyond this point. I've managed to have a POST at 470 with the same voltages but skew slightly off (50ps to 150ps). But I've never been able to get a POST beyond 470 no matter the clock skew and FSB/MCH overvoltage (cranked them up to +0.2). I have played a bit with the CPU/PCIex clock overvoltage but with no noticeable effect whatsoever. All these tests were done with a 6x CPU mutliplier and 2.00D RAM multiplier (to get 533MHz x 2....)

    Temperatures never went beyond 40 degrees celcius for both system and CPU (Prime95 CPU only as well as mixed analysis modes) when able to reach Windows....

    Now the question is: is it really possible to get a 533MHz FSB on an X48-DS5? If so, what is restraining my system to do so?

    I am puzzled.....

    tcn.
    Last edited by tcn; 03-15-2010 at 08:39 AM.

  2. #2
    Chike is offline Senior Member
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    Default Re: 533 MHz FSB on X48; myth or reality?

    What about GTL references, have you tried playing with them?

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    Default Re: 533 MHz FSB on X48; myth or reality?

    Quote Originally Posted by Chike View Post
    What about GTL references, have you tried playing with them?
    I tried and -3% doesn't seem to do a big difference (on both; didn't try all combinations). I'm trying to figure out how to play with the GTL though. The concept is not new to me but GTLREF1 and GTLREF2; which one is high and which one is low??? And what are auto and normal? Are they moving around when FSB/MCH are tweaked? If so, a proper voltage on the FSB/MCH should help the GTL ....

    I will continue tonight with GTL and skew to get 480MHz, at least. I doubt I will make it stable though.
    X48-ds5; Q9550S, 440MHz FSB, 3.733GHz; NH12CP-SE14; Mushkin 996599 (5-5-5-12, pc2-8500),
    Sapphire HD-5770 Vapor-X, EVGA NVidia 9800GT; Cooler Master HAF932;
    Corsair TX750

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    Chike is offline Senior Member
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  5. #5
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    Default Re: 533 MHz FSB on X48; myth or reality?

    Yeah, that's the thread I followed to say that people did overclock it far beyond 533MHz. I followed his steps but I fail before reaching 480. And his voltage levels are very low (FSB+MCH). He doesn't talk much about GTL though.
    X48-ds5; Q9550S, 440MHz FSB, 3.733GHz; NH12CP-SE14; Mushkin 996599 (5-5-5-12, pc2-8500),
    Sapphire HD-5770 Vapor-X, EVGA NVidia 9800GT; Cooler Master HAF932;
    Corsair TX750

  6. #6
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    Default Re: 533 MHz FSB on X48; myth or reality?

    Your problem is your CPU, not your board. The 65nm CPUs just don't reach the same FSBs as some of the 45nm ones will achieve. While some 65nm CPUs may do 500+, many hit a "FSB wall" before that. I've got an C2D E6300 (not a 45nm Pentium, the original 65nm one) that hits a wall at ~430Mhz FSB, and that's not even that bad for the first generation C2Ds.


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    Default Re: 533 MHz FSB on X48; myth or reality?

    Quote Originally Posted by Nickel020 View Post
    Your problem is your CPU, not your board. The 65nm CPUs just don't reach the same FSBs as some of the 45nm ones will achieve. While some 65nm CPUs may do 500+, many hit a "FSB wall" before that. I've got an C2D E6300 (not a 45nm Pentium, the original 65nm one) that hits a wall at ~430Mhz FSB, and that's not even that bad for the first generation C2Ds.
    I thought something like this would be preventing my system from going higher but didn't think about the CPU. I only saw the core frequency and not the interface itself. Makes sense; I don't like it but makes sense. So I would have found the maximum frequency of the FSB of this chip then.

    450MHz isn't bad at all then for this processor. I wanted to change my duo for a quad next summer; I guess I just found myself another reason .

    Thanks guys.
    X48-ds5; Q9550S, 440MHz FSB, 3.733GHz; NH12CP-SE14; Mushkin 996599 (5-5-5-12, pc2-8500),
    Sapphire HD-5770 Vapor-X, EVGA NVidia 9800GT; Cooler Master HAF932;
    Corsair TX750

  8. #8
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    profJim is online now Chief Munchkin + moderator
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    Default Re: 533 MHz FSB on X48; myth or reality?

    Nickel020 is right on the money.
    My E6550 is a step down from your cpu, and a 50% overclock is about the best that the E6550 can usually do.
    With my EP45-UD3P, I could boot and run stability tests up to 527MHz, but it failed these tests above 494MHz.
    I would expect that your E6750 can be stable with a 40 - 45% overclock and possibly a bit higher if you've got a really "good" cpu.
    Q9650 @ 4.10GHz [9x456MHz]
    P35-DS4 [rev: 2.0] ~ Bios: F14
    4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
    MSI N460GTX Hawk Talon Attack (1GB) video card <---- SLI ---->
    Seasonic SS-660XP2 80 Plus Platinum psu (660w)
    WD Caviar Black WD6401AALS 640GB (data)
    Samsung 840 Pro 256GB SSD (boot)
    SLI @ 16/4 works when running HyperSLI
    Cooler Master 120XL Seidon push/pull AIO cpu water cooling
    Cooler Master HAF XB computer case (RC-902XB-KKN1)
    Asus VH242H 24" monitor [1920x1080]
    MSI N460GTX Hawk (1GB) video card
    Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium
    HT|Omega Claro plus+ sound card
    CyberPower CP1500PFCLCD UPS
    E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
    Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
    Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
    HT|Omega Striker 7.1 sound card ~~ Asus VH242H monitor [1920x1080] ~~ Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
    .


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