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980Ti measure voltage

Guest2

Guest2

Guest2

Soldato
Joined
6 May 2009
Posts
20,384
How do you measure voltage using a probe on the EVGA GTX 980Ti classified card?

I have found the following online but there is absolutely nothing mentioned in the manual about it. To be honest the manual is terrible with nothing about dual bios / voltage readings or anything the card has to offer

To the left [of the bios selector] there is a terminal strip which grants direct access to the voltage measurement points. They are not labeled on the PCB, so the user will have to either look them up in the manual to access the correct pins, or simply try them out.
Click to expand...

I have tried a few other links online on kingpincooling.com but they are not found
 
You'll need to connect your probe to one of the points and the other ground point to a ground wire on the PSU (the -12v line will do just fine).

Be careful not to cross them and touch more than one at a time as that could have some nasty effects.
 
PSU? Don't you just put the positive on one pin (on the terminal strip) and the negative on the other?

Its what pin does what im not sure about and nothing is mentioned in the manual
 
Just put the positive on the connector suggested and the negative on the motherboard base/case.
As in the plate it is attached to will always be - you don't need to touch the PSU. NOT THE MOTHERBOARD ITS SELF!

PC cases are always negative if metal and you have have a good contact point. ;)
 
Hope this helps I know am rubbish at drawing. :p

z7xUDoW.jpg.png
 
I don't know if im being stupid or I just have a **** Multimeter, I have a 'Crenova® MS8233D Digital Multimeter AC Voltage Detector Portable Tester Meter with Backlight'

I correct the probes and turn it on to the solid line with dotted line below and V. If I do so much as move the cables the mV reading bounces up and down all over the place. It also shows 00.0 only instead of 0.0000 or even 0.00

I connected the positive end to the left pin and negative to the right pin but no change, apart from if i move the cables at all, then it may jump up to 10.5mV or anything.

I pulled this from an EVGA forum...

Test the two far outside pins.

This will be Core voltage (far left) and ground) far right. This will reduce (not remove!) the risk of shorting the pins out.

The pins go, from far left to right:
Core, ground, memory, ground, VRM, ground, 12v, ground, 3v or 5v (can't remember), ground
Click to expand...
 
What mode have you set your DMM to?

It will be DC voltage, not AC. You will also need to set to the correct range to display the reading accordingly.

Your model appears to be auto range sensing, so skip that bit. Set it up as per this image:

dmm_dcvolts.jpg


Test your DMM against a known, AA battery etc, to ensure it's working.


I just tested against far left pin (+ probe) and far right pin (- probe) on my 980Ti Classified, idle reading of 1098mv.
 
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Excellent, thanks Sin Chase. Got it working now, I had the red in the far left and black in the right

Interesting findings with my 980Ti Classified. Idle 866mV which is the correct VDDC reported in GPUZ however multimeter full load is 1233mV where GPUZ shows 1212mV. If I add or remove voltage in Afterburner it stays the same. - I sort of expected it was doing nothing!

I am also using an unlocked but not modified bios so presuming it should be a max voltage of 1212.5. I do have +25mV applied in Afterburner since installing drivers and setting up so maybe it has just remembered that from the first time but anytihng after is not changing the voltage. I tried rebooting but still 1233mV

I might try hard locking in 1250mV tomorrow in the voltage tables, slightly increasing power tables and seeing if it is actually 1250mV

edit - before I do that i'll take off all overclocking software, reinstall drivers and measure volts
 
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Don't forget there'll be some error on that reading. Did a quick search and it says the tolerance is

200mV/2V/20V/200V ±(0.5%+2)

so if it reads 1233 mV it could in reality be anywhere between 1225 and 1241 mV (if my maths is right...)
 
Thanks all

Every time I flash bios / reinstall drivers I always use display driver uninstaller in safe mode after removing any third party tool like Precision or Afterburner including the profiles
 
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