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Posts posted by ground

    ground - GA-EP45-UD3P @ 726.3MHz - 726.29 MHz Reference Frequency

    in Result Discussions

    Posted

    1 hour ago, GRIFF said:

    Great work man. What a fsb you made with air cooled NB?

    Didn't test on air, but on water I couldn't validate over 695 with the first board. Second board went straight cold and needed less vNB for 725 (1.66V instead of 1.72V), but i don't feel like my boards vary a lot in bin, given that they were both stupidly easy to get to 720+ with several CPUs (had both boards at 720+ with 3 CPUs each)

    fsb.png

    (6 unbinned chips taken cold, E8400 726, 725, 705; E8500 720, 715; E8600 720)

    On 5/1/2021 at 5:56 AM, ObscureParadox said:

    I need to get you that high speed mem asap it seems :P

    Yes! Mem limited now I'm pretty sure, as absurd as it may seem :D 

    On 5/1/2021 at 4:13 AM, wytiwx said:

    Now you know what I mean that made 750 FSB ordinary ;)

    Yeah... I'll certainly try for more in a coming session, have a couple more things coming soon that should make even more achievable.

    Thanks to the other commenters ;) Appreciated!

    • Like 1

    CPU 700MHz Bus Speed Project

    in General overclocking

    Posted

    On 4/9/2021 at 4:13 PM, wytiwx said:

    Vcore: 1.40V to 1.60V (no need LLC)

    Vtt: 1.40V to 1.60V

    Vpll: 1.35V (air) to 1.59V (LN2)

    Vnb: 1.46V to 1.70V (get a IHS on NB chip! make sure NB cooling is good!)

    (see previous comment for my results, just adding a note for volts I ran)

    Last couple days I ran a pair of UD3Ps and a couple Wolfdales and, at least for my chips and boards on Dry Ice, these voltages varied quite a bit from yours. Maybe I was still doing something else wrong, but with my chips on Dry Ice I had the following sweet spot voltages:
    Vcore: 1.66V-1.74V (depending on chip)
    Vtt: 1.6V-1.66V (depending on chip)
    Vpll: 1.35V seemed just fine cold too, saw no gain going higher at all, rather lost some frequency. Maybe there are some chips that benefit from higher PLL, but mine certainly didn't.
    Vnb: 1.64V-1.74V (depending on both board and chip; one board was higher voltage then the other. NB had an IHS and a waterblock base filled with dry ice (no contact fluid))

    Further notes from the session
    - I didn't run into a single <700 fsb chip with basically unbinned chips (quick test on asus x48 for 600 fsb air); this doesn't mean they don't exist, but it supports the claim that if you can't do 700 fsb the board or settings is the issue not the CPU
    - even if a CPU can't boot 700 fsb doesn't mean its bad; one of my 725 valid chips failed booting anything over 660 fsb into OS.
    - cold NB helps a lot; I only tested one of the boards with ambient NB and ran into a wall with CPUz open at 695 fsb. With cold NB, 700 worked really easily.
    - I really need better DDR2; these sticks barely validated 750MHz on cold, I am pretty sure given the likely higher load through the 1:1 divider they are what limited me at 725 fsb, given it was 2 unique boards and 2 unique CPUs that walled there. If possible, I'll soon retry under Ln2 with some new sticks.
    - also for next session: compare PCI card to no PCI card. Due to convenience I completely forgot trying a PCIe card, thus there is a decent chance it helped quite a bit with these results.
    - I had one chip where MCH clock skew at 50 gave another 2-3 Mhz if I remember right, not a big difference. Wrong CPU clock skew (tried 0-150 with most chips) can cost quite a lot of frequency. Keeping CPU clock skew above MCH clock skew seems mandatory.
    - don't bother trying asus p45 boards cold. I tried P5Q3 Deluxe and P5Q Pro, and both struggled even booting over 630 fsb with a 700+ gigabyte chip.
    -710 fsb boot + 725 fsb in windows valid video

     

    I'll certainly try again pretty soon, though first I gotta get some better memory and will likely airbin the CPUs on these boards now that I have a rough idea how to work them. Have a couple more boards I'm considering picking up...

     

    • Like 2
    • Thanks 2

    CPU 700MHz Bus Speed Project

    in General overclocking

    Posted · Edited by ground

    currently trying a pair of UD3Ps on Dice... so far

    3/3 CPUs >715 FSB

    2/2 Boards >720 FSB

    Given what I’m managing on unbinned boards with unbinned CPUs on dice I am starting to believe in 800...

    https://hwbot.org/submission/4737529_

     

    Out of 6 random chips I've taken cold i've got now:

    E8400 705

    E8400 710

    E8500 715

    E8500 720

    E8600 720

    E8400 725 C0

    E8400 725

    E8400 726

     

    EP45-UD3P rev 1.0 - 726 confirmed

    EP45-UD3P rev 1.0 - 725 confirmed (did not try 726 chip in it)

    EP45-UD3P rev 1.0 - 710 confirmed (only tried 1 random chip in it)

    EP45-UD3 rev 1.0 - 725 confirmed (only tried 1 random chip in it)

    • Like 1
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