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Help in measuring vGPU with a multimeter.

post #1 of 4
Thread Starter 
This will probably piss some people off, but I have been searching for days and am now giving up.

I recently flashed the bios on my xfx 9800 gt to increase the voltage from what I believed was 1.05 to 1.1 . But I am skeptical that anything happened. I own a multimeter- got it from a friend, model Sperry DM-350A- and would like to test the voltage physically.

I have this fear that if I start touching pieces of metal all over my GPU that in a puff of smoke I will no longer have a GPU, possible bringing down the rest of the system. Since I learned how to do the BIOS flash from PizzaMan, I felt a good place to continue this was on the same forum.

I have never used a multimeter. About 20 min ago I figured out, after nearly an hour of investigation, how to test a AAA battery and could not explain how I did that to anyone. So if this is way too newbie please send me to the appropriate place so I do not bog down your brilliant forum.

I found this picture on this forum that is suppose to be my card http://www.xtremesystems.org/forums/attachment.php?attachmentid=68253&d=1196804192 It does not look like my card.

I found this picture linked to another forum but from this forum http://img141.imageshack.us/img141/3672/xfx8800gt2yt0ut5.jpg Looks like my card.

I can see "most accurate reading" on my board but have no idea what to do with this info.

Do you stick the red probe thing into that hole?

Do you touch the black probe thing to the case, a ground on the card, should I just lick it?

What do I set the multimeter to, black V with line dotted line or red V with squiggle?

Am I wrong about the pictures?

Do I do it while the system is on, risky?

I am lost here. I figured that somewhere on the internets there would be a video or a discussion on this. I even thought there would be a discussion on my exact card.. Maybe I am not that good at searching online or searching your forum.

Just some basic instructions that a chimp could follow, if there is a "basic" way of doing this.

You guys rock!
My System
(14 items)
 
  
CPUMotherboardGraphicsRAM
phenom II x4 945 95W xfx 8200 mi-a78s-8209 xfx 9800gt 512 ddr3 4 gig (2x2gig) corsair pc2-6400 CM2x2048x 
Hard DriveOptical DriveCoolingOS
Hitachi 1tb Hitachi HDT7210 CoolerMaster Hyper 212 EVO Windows 7 Ultimate 64 bit 
MonitorPowerCase
Crappy Westinghouse 850W POWER SUPPLY BLACK EDITION PCA  Azza solano 
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My System
(14 items)
 
  
CPUMotherboardGraphicsRAM
phenom II x4 945 95W xfx 8200 mi-a78s-8209 xfx 9800gt 512 ddr3 4 gig (2x2gig) corsair pc2-6400 CM2x2048x 
Hard DriveOptical DriveCoolingOS
Hitachi 1tb Hitachi HDT7210 CoolerMaster Hyper 212 EVO Windows 7 Ultimate 64 bit 
MonitorPowerCase
Crappy Westinghouse 850W POWER SUPPLY BLACK EDITION PCA  Azza solano 
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post #2 of 4
Hey smile.gif There's nothing to worry about smile.gif

dt830b-digital-multimeter-clamp-meter.jpg

Most multimeters should have similar symbols, even if they're in different places around the dial. The V with the line and the dots is DC voltage. The V with the wavy line is AC.... you'll never need that for probing computer gear wink.gif

The 2000m and 20 are the maximum voltages the meter can read. If you think you'll be measuring a value thats less than 2v (e.g..... vCore) then use 2000m. If the value is over 2v, use "20" Nothing bad happens if the voltage is too big for the setting, you'll just get told the value is too big.

The different settings have differently calibrations/tunings so the reading is as accurate as possible.

The terminals for the leads..... COM means common..... it's always used. Plug the black lead in here (black..... ground.....common.....it's the standard colour ID)

For measuring voltage, plug the red one into the V (ohm) mA terminal.

As for getting voltages..... yea, you have to do it with the computer on.


For GPUs, a good ground spot is from the PCI-E power plug. The row of pins FURTHEST AWAY from the PCB edge is ground, I always getting better readings from the pins on either side, not the one in the middle.


An easy place to get a voltage reading is using the point in the guide, yup.... or.... using the pins from an inductor. If you ever read voltages from there, one pin will be lower than the other, they always create a voltage drop.




As to your BIOS work..... I really don't think the voltage was increased. There might be one or two designs that do, but most don't support voltage mods at software level,


Hope that helps.... any questions just ask
Edited by K404 - 4/25/12 at 8:58am
post #3 of 4
Thread Starter 
well I did a voltage check, but I flashed back to the original BIOS before I did it so at least I know what the stock vGPU was. My reading was 1.16-1.17 volts. So now I know why ATITool was seeing lots of artifacts when I flashed the 1.1 volts Bios.

The big question is should I try a 1.2 volts bios to see if I can change the volts or should I just try the 1.1 volts bios again?
My System
(14 items)
 
  
CPUMotherboardGraphicsRAM
phenom II x4 945 95W xfx 8200 mi-a78s-8209 xfx 9800gt 512 ddr3 4 gig (2x2gig) corsair pc2-6400 CM2x2048x 
Hard DriveOptical DriveCoolingOS
Hitachi 1tb Hitachi HDT7210 CoolerMaster Hyper 212 EVO Windows 7 Ultimate 64 bit 
MonitorPowerCase
Crappy Westinghouse 850W POWER SUPPLY BLACK EDITION PCA  Azza solano 
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Reply
My System
(14 items)
 
  
CPUMotherboardGraphicsRAM
phenom II x4 945 95W xfx 8200 mi-a78s-8209 xfx 9800gt 512 ddr3 4 gig (2x2gig) corsair pc2-6400 CM2x2048x 
Hard DriveOptical DriveCoolingOS
Hitachi 1tb Hitachi HDT7210 CoolerMaster Hyper 212 EVO Windows 7 Ultimate 64 bit 
MonitorPowerCase
Crappy Westinghouse 850W POWER SUPPLY BLACK EDITION PCA  Azza solano 
  hide details  
Reply
post #4 of 4
Thread Starter 
Your right I get 1.17v on every setting.
My System
(14 items)
 
  
CPUMotherboardGraphicsRAM
phenom II x4 945 95W xfx 8200 mi-a78s-8209 xfx 9800gt 512 ddr3 4 gig (2x2gig) corsair pc2-6400 CM2x2048x 
Hard DriveOptical DriveCoolingOS
Hitachi 1tb Hitachi HDT7210 CoolerMaster Hyper 212 EVO Windows 7 Ultimate 64 bit 
MonitorPowerCase
Crappy Westinghouse 850W POWER SUPPLY BLACK EDITION PCA  Azza solano 
  hide details  
Reply
My System
(14 items)
 
  
CPUMotherboardGraphicsRAM
phenom II x4 945 95W xfx 8200 mi-a78s-8209 xfx 9800gt 512 ddr3 4 gig (2x2gig) corsair pc2-6400 CM2x2048x 
Hard DriveOptical DriveCoolingOS
Hitachi 1tb Hitachi HDT7210 CoolerMaster Hyper 212 EVO Windows 7 Ultimate 64 bit 
MonitorPowerCase
Crappy Westinghouse 850W POWER SUPPLY BLACK EDITION PCA  Azza solano 
  hide details  
Reply
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