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Thread: X48 DQ6 E0 E8500 at 4085Mhz




  1. #231
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    Default Re: X48 DQ6 E0 E8500 at 4085Mhz

    Above 454 BCLK it seems Load-Line Calibration needs to be enabled, but LLC gets slagged on many sites. LLC Auto seems same as LLC disabled. Had 4.427GHz working a number of times, passing Prime95 for week or more, then blue screens and will not boot without bluescreen. Upping volts somewhere each time to get back in. Currently on last settings below.

    Looking at bios greyed out standard cpu voltage in 4.4 profile noticed that it said 1.43125 while i had 1.39375 manually entered above it. Hadn't noticed anything but 1.25 there before. Looked in other profiles, all 1.25. Go back into 4.4 profile 1.25? Save and boot, bluescreen. Is my mobo trying to tell me something?



    November 21:
    When the ambient is over 32C bluescreens on reboot common for those profiles above 450MHz. 4.25GHz rock solid.


    Regarding GTLREF:
    Data busses are much more sensitive to adjustments as these lines are consistently more heavily loaded than the address busses. Enterprising enthusiast who wish to experiment would do much better to modify the data bus GTL reference voltage level(s) before any others.Adjusting A/GTL+ Levels for Increased FSB Signaling Margins and Overclocking - The Tech Repository Forums
    GTL Reference Data Strobe Input Buffer (GTLREF0)
    GTL Reference Address Strobe Input Buffer (GTLREF1)

    GTLREF values do not represent individual cores, but pairs of cores. One for data strobe for two cores and one for address strobe for two cores. If your mobo has four GTLREFs you can set two cores differently to the other two on a quad. That's what it looks like to me. (There's a pair of cores on each die, so 2 refs for each die.)

    Vtt is "FSB Overvoltage Control"

    67% of nominal Vtt of 1.1v is a nominal .737v. All these are nominal voltages, not measured.

    My Vtt was set at +.1 (1.2v) from the start giving a subsequent nominal 67% GTLREF of .804v This became obviously unstable by 445 fsb-bclk.
    At 445 fsb-bclk -3% on the data GTLREF0 gave .768v (64%)
    At 454 Vtt was changed from 1.2v to 1.25v, but left at -3%, 1.2v =.768v, 1.25v = .8v (Both 64%)
    At 466 with Vtt of 1.3 -6% on the data GTLREF0 gave .793v (61%)

    At 466 with Vtt of 1.25v -3% on the data GTLREF0 gave .8v (64%), -6% gives .7625v (61%), -9% would be .725v (58%)

    The above being successful boot setting voltages GTLs appear totally Vtt dependent, and want to stay between .737v and about .8v for my particular hardware.
    My GTLREF0 (Data) seems to be the important one.

    In the global article substitute GTLREF for Vref and it becomes clearer. Global
    Last edited by Salty; 11-22-2009 at 04:38 PM.





    CPU
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    i7 950 - DO stepping - Batch #3014A844
    Cooling = EK HF Full Nickel
    - XSPC RX360 - Laing DDC 18W - XSPC Bay Reservoir
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  2. #232
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    Default Re: X48 DQ6 E0 E8500 at 4085Mhz

    To WrxSTI who couldn't get his X48-DQ6 to boot over 450fsb with pci on 100. http://forums.tweaktown.com/f69/ga-x...problem-36357/ Maybe he's right.

    Decided even if I don't quite get how GTL's work, didn't matter. What mattered was how far OUT my voltages were, and that would prob be very individual. So played with it a bit aggressively. When Prime began, ambient was still 32C at 1:57AM after 35C day (computer room temps, not outside). Got a cool change and finished at ambient 26C. Just used the computer like normal while Prime was running. Very happy.

    Strange things sure can happen with wrong GTLs. SuperPi results can get inconsistent by a full second, but Everest surprised me (normally never below 55ns latency, and cache latency 3.9ns, suddenly gave 51ns and then 7.9ns on cache.

    Now everything behaves. Now I think I actually have the right settings for my board.

    Don't think I should run LinX on a 35C day though.



    Last edited by Salty; 11-25-2009 at 05:20 AM.





    CPU
    =
    i7 950 - DO stepping - Batch #3014A844
    Cooling = EK HF Full Nickel
    - XSPC RX360 - Laing DDC 18W - XSPC Bay Reservoir
    Motherboard = GA-X58A-UD3R Revision 2
    , BIOS Version = Award FC
    Ram = 3x2gig Corsair TR3X6G1600C8D G
    Video = 2 X Palit GTX460 Sonic Platinum 1GB OC sli
    Monitor = 22" LG Flatron W2242T 1680 x 1050 Case = Coolermaster CM690
    PSU = Corsair HX850
    OS = Windows 7 Professional x64


  3. #233
    Chike is offline Senior Member
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    Default Re: X48 DQ6 E0 E8500 at 4085Mhz

    76c with prime, yeah i'd skip IBT.
    No Clock Skew were needed?

  4. #234
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    Default Re: X48 DQ6 E0 E8500 at 4085Mhz

    With the 76C - I plead the 32c ambient as partly responsible for highest temp. Running 69-70 by finish.

    I don't think skew is actually needed till 480 or so on dual core, lower on quads. Have not seen an improvement with it yet.

    Might test that PCI thing out a bit more to see if that was the clincher or not. After work tho.





    CPU
    =
    i7 950 - DO stepping - Batch #3014A844
    Cooling = EK HF Full Nickel
    - XSPC RX360 - Laing DDC 18W - XSPC Bay Reservoir
    Motherboard = GA-X58A-UD3R Revision 2
    , BIOS Version = Award FC
    Ram = 3x2gig Corsair TR3X6G1600C8D G
    Video = 2 X Palit GTX460 Sonic Platinum 1GB OC sli
    Monitor = 22" LG Flatron W2242T 1680 x 1050 Case = Coolermaster CM690
    PSU = Corsair HX850
    OS = Windows 7 Professional x64


  5. #235
    Lsdmeasap's Avatar
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  6. #236
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    Default Re: X48 DQ6 E0 E8500 at 4085Mhz

    Indeed, any rise in ambient temps will effectively increase your delta T in a 1:1 fashion.

    In my experience, skew is actually seldom needed. Maybe when pushing the last 1-2% frequency increase on an already "on the limit" FSB, maybe as high as 500FSB+ on a Quad and over 533 on a dual core. I've seen many, including D-an-W, Boombasticsloth and Octopus also go well over 533 with their E8xxx's, no skew required. If you do try skew at any time, up to 200 either way is worth tryinh, with more than 150 probably being of no benefit and almost certainly any higher than 200 making things worse. Also if excessive skew is needed, it is likely the actual cause of the instability lies else where, like references.

    Of course, the X48 is a slightly different challenge, but you seem to be doing OK with the usual adjustments. The increase in Vcore percentage for the ~200MHz increase from 4.25GHz to 4.427GHz leads me to believe you're getting towards the end of what the CPU is capable of. From now on, I wouldn't be surprised if, as well as an increase in difficulty getting stable, further frequency increases could bring a disproportionate heat rise compared to frequency added and Vcore as well as much more Vcore per 100MHz needed to be stable. I suppose one could call this the point of major diminishing returns.

    I hope once you get a cooler day, your IBT goes well. As you look to be a gamer, I'd also run CPUID in the background with maybe GPU-Z for its nice histogram feature while you first run a hour loop of Vantage followed by a decent gaming session. As always, you'd be surprised how the effect of a GPU adding heat to the case can also throw off CPU temps and even stability. You have (I presume) your GPU running off the 450W bay PSU which avoids most of the slight PSU fluctuations when a GPU is at max draw. The card will still be drawing 75W from the main PSU via the actual PCIE slot, but that should be no problem at all.
    Coolermaster CM 690 II advance Case
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  7. #237
    Lsdmeasap's Avatar
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    Default Re: X48 DQ6 E0 E8500 at 4085Mhz

    Sounds like a new cooler is definitely in order here, those are pretty warm temps for prime

  8. #238
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    Default Re: X48 DQ6 E0 E8500 at 4085Mhz

    Ah LSD, what is better air cooling than a True 120? While I'd love to water cool the pc, my car has developed a few problems. For a while I will have to be content with loading 4.25 for >35C days, until those car problems are sorted.

    Also, cannot help but think pci >100 above 450fsb a big factor 4 stability, with my board.

    Psycho: Might try the high-fsb/lower-multiplier next cool break in weather.





    CPU
    =
    i7 950 - DO stepping - Batch #3014A844
    Cooling = EK HF Full Nickel
    - XSPC RX360 - Laing DDC 18W - XSPC Bay Reservoir
    Motherboard = GA-X58A-UD3R Revision 2
    , BIOS Version = Award FC
    Ram = 3x2gig Corsair TR3X6G1600C8D G
    Video = 2 X Palit GTX460 Sonic Platinum 1GB OC sli
    Monitor = 22" LG Flatron W2242T 1680 x 1050 Case = Coolermaster CM690
    PSU = Corsair HX850
    OS = Windows 7 Professional x64


  9. #239
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    Default Re: X48 DQ6 E0 E8500 at 4085Mhz

    Hmm, not much is better than that except water. Have you done the Washer or Penny Mod on your TRUE yet? Maybe you need to, this helps a lot often.

    Just google TRUE Washer Mod or TRUE Penny Mod and you should find both methods. If you need help finding it let me know.

    PCIE could help anytime really, so having to use more is not a bad thing. Just keep it under 105-110 for safety

  10. #240
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    Default Re: X48 DQ6 E0 E8500 at 4085Mhz

    That's a very good idea. I've modded my TRUE using a 1" washer and a 1.5mm copper shim that came with one of my Scythe Musashi GPU coolers.

    Place the penny/washer (must be quite large, almost the same size as the base plate for even force) under the cross bracket then carefully tighten the screws. Even with the washer underneath, my TRUE still screwed down all the way. It's now much harder to twist and cut my IBT load temps by 5-6c. It didn't effect my prime temps because they were already quite low (58c). If your Prime temps are high, it will cut those too, just that the contact pressure on mine was sufficient for the Prime temps.
    Coolermaster CM 690 II advance Case
    Corsair HX750 (CWT, 91%(80+ Gold rated @230V) single 62A 12V rail
    P55A-UD4 v2.0 @ F14
    Core i5 760 @ 20 x 201, 4.02GHz
    TRUE Black with a single Noctua NF-P12 pumping out 55 CFM @ 19db .
    2 x 2GB Mushkin Ridgeback (996902), @ 7-10-8-27, 2010-DDR, 1.66v
    2 x Gigabyte GTX 460 1024MB in SLI (Pre OC'd to 715MHz core and 1800MHz VRAM) @ 850 Core / 4100 Mem.
    Intel X25-M Boot Drive (OS and Programs) 200MB/s Read & 90MB/s Write
    Corsair X32 200MB/s Read & 100MB/s Write
    WD Caviar Blue 640GB C (Steam, Games, Storage, Temp Files & Folders, etc)
    Samsung F3 500GB Backup/Images
    Noctua 1300RPM 19dB case fan (rear extraction)
    3 x 140 MM Coolermaster LED fans (one front intake, one top extraction, one side intake)
    Dell Ultra Sharp 2209WAf E-IPS @ 1680x1050

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