Base VTT changed from 1.1v to 1.2v in E758 BIOS 44?

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djk11
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2010/02/12 21:59:48 (permalink)
I just noticed my old setting of +200mV VTT in BIOS was setting my VTT to 1.4v in Eleet, +200mV VTT in BIOS used to be 1.3v in Eleet.

The base VTT for E758 used to be 1.1v but it looks like its 1.2v now. Not sure when this changed happened, but I don't remember it in BIOS SZ2X.

Is anyone else seeing this on their E758 board?

If people are flashing the new BIOS and just copying over their previous settings they may be overvolting VTT by 100mV without realizing. I never really understood why BIOS treated VTT as a relative +mV setting instead of just an absolute voltage like the others, would be easier to check it that way I'd think.


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    linuxrouter
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    Re:Base VTT changed from 1.1v to 1.2v in E758 BIOS 44? 2010/02/12 22:28:22 (permalink)
    I just checked on my 758 and you are right. It looks like the base VTT was increased to 1.2v. My VTT has been running +100mv more than what was necessary. I just lowered it back down to 1.25v where it was before. Voltage at the testpoint is between 1.15 and 1.16 so the difference between BIOS set voltage and real voltage is still roughly the same as previous BIOS versions.

    Thanks for bringing this up.

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    Moltenlava
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    Re:Base VTT changed from 1.1v to 1.2v in E758 BIOS 44? 2010/02/13 01:43:49 (permalink)
    i guess this does make things a little easier as the base CPU VTT voltage for all the later EVGA X58 boards (like the Classified) is 1.2v only the E758 was 1.1 which made giving advice, templates a little tricky as you always had to say what the setting would be for the E758 and what it would be for the rest of the EVGA X58 boards.

    Once word gets around this shouldnt be a problem, thanks for posting.
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    jliles01
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    Re:Base VTT changed from 1.1v to 1.2v in E758 BIOS 44? 2010/02/13 03:14:50 (permalink)
    My board came with BIOS IX58SZ2W, which I don't even see listed on the BIOS download page. So I don't really know where my BIOS falls in the list of updates. I've had it about 1 month.

    I have my VTT set @ +125mV, and E-LEET reports my VTT as 1.33V. Since 1.2 + .125  is closer to 1.33 than 1.1 + .125 is, could my BIOS also have it set at 1.2 base?

    Since I have my Vdimm @ 1.65, and E-LEET reports it as 1.73, I figured it was also reporting my VTT higher as well.

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    HalloweenWeed
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    Re:Base VTT changed from 1.1v to 1.2v in E758 BIOS 44? 2010/02/13 07:26:43 (permalink)
    FYI: I have bios SZ2X and VTT default was 1.1 (I double checked it). I have adjusted it +100 (1.2), and E-Leet shows VTT 1.3V (1.28-1.31). My setting is "VDroop Enabled."

    My point is don't trust E-Leet VTT monitor to show what the BIOS VTT setting is.
    post edited by HalloweenWeed - 2010/02/13 07:30:17

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    djk11
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    Re:Base VTT changed from 1.1v to 1.2v in E758 BIOS 44? 2010/02/14 13:14:51 (permalink)
    Thanks for checking the voltage with multimeter linuxrouter. Guess its not so bad since the actual voltage is about .1v under the BIOS setting, if I remember its about the same discrepancy for DIMM voltage.

    It would have been nice to see this in the BIOS changelog though. Some people with high OCs already running their VTT very high may become unstable if they flash BIOS then just copy their settings over and get their VTT bumped by an extra 100mV without noticing.

    Like Moltenlava says it does make it easier if all the X58 boards have the same base VTT, even easier would be if the BIOS just used the actual voltage like 1.3v instead of +100mV.

    Not sure about BIOS SZ2W jliles01, I can say that SZ2X still had the old base VTT of 1.1v. If you're bumping by .125 and getting ~1.325 it would seem the base VTT on that BIOS is already 1.2v. Maybe EVGA has been testing this base voltage up and down over a few BIOS versions? I only noticed it was changed from 1.1v to 1.2v on BIOS 43 beta and BIOS 44.

    HalloweenWeed if you check the Voltages tab in Eleet it "should" show how you've set the BIOS. In the Monitoring tab you can see how Eleet is reporting the voltage, but like linuxrouter showed the actual voltages measured directly from the testpoints on the board are a bit different from what Eleet/Everest/HWMonitor report, the software monitors all read from the same sensor.


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