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Helpful ReplyRe-calibrate vDIMM X58 E760

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529th
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2016/02/05 10:11:51 (permalink)
Is there any way to calibrate the vDIMM voltage setting?  Like any adjustments that will sync the bios setting to what my multi-meter reads on the terminal?  1.63v in bios will show 1.65v on the multi-meter but when it's under load it will droop to 1.628v
 
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    bob16314
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    Re: Re-calibrate vDIMM X58 E760 2016/02/05 14:24:03 (permalink) ☄ Helpfulby 529th 2016/02/05 14:50:49
    No..You're only talking ~.02V difference, and that is insignificant..Everything has a +/- voltage tolerance spec that it will operate within as designed, nothing is perfect..Your multimeter has tolerances (margin of error) too..DDR3 voltage tolerance is +/- 5% if I remember correctly..Your RAM manufacturer's technical info page might have the tolerance spec, like Kingston here and here, or you could email them if not and you want to know..It's not unusual to have minor differences between what's shown in BIOS and on your multimeter or in software..The difference between idle and load voltage is also normal, it's called Vdroop..If your board has very fine VDIMM adjustments, you could compensate for the Vdroop under load, but then you'd have a higher idle voltage..The short story = Don't worry about it if it's working okay.

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    Re: Re-calibrate vDIMM X58 E760 2016/02/05 14:56:03 (permalink)
    Thank you for that great explanation!  The thing I worry about is my memory has to vdroop no less than 1.66 or 1.65v to operate properly, afaik.  It's a very old MGH-IC Elpida Hyper kit that is still in operation (2000MHz cl8.8.8.21 tRFC 60 2T @ 1.65v).  So in order to maintain that minimum vdroop I have to set it fairly high, like 1.7v and that's beyond Intel safe spec.  I understand keeping the VTT & vDIMM within a .50 delta but I'm just not sure if any issues will arise with that high of voltage.
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