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Author Topic: WattMan requires VDDCI<=VDDC  (Read 2885 times)
nerdralph (OP)
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October 07, 2016, 01:15:00 AM
 #1

After many hours of trying different settings in GPU-Tweak II, MSI AB, and WattMan, I finally figured out how to undervolt below 1V.  I saw screen shots of GPU-Z showing people running at ~900mV, so I knew it was possible.  The default VDDCI (memory controller voltage) in WattMan is 1V.  In order to get the GPU voltage below 1V, I had to reduce the memory controller voltage as well.
Someone may have already pointed this out in one of the threads hear, but I couldn't find it.

With WattMan set to 900mV for VDDC and VDDCI, I'm seeing 887mV in GPU-Z, and total system 120V AC power consumption is 146W with a cheap 80+ bronze PSU.  My hashrate is 26.1-26.3Mh with an Asus Rx 470 Strix clocked at 1025/1875(1.5Ghz strap).
rednoW
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October 07, 2016, 06:17:45 AM
 #2

After many hours of trying different settings in GPU-Tweak II, MSI AB, and WattMan, I finally figured out how to undervolt below 1V.  I saw screen shots of GPU-Z showing people running at ~900mV, so I knew it was possible.  The default VDDCI (memory controller voltage) in WattMan is 1V.  In order to get the GPU voltage below 1V, I had to reduce the memory controller voltage as well.
Someone may have already pointed this out in one of the threads hear, but I couldn't find it.

With WattMan set to 900mV for VDDC and VDDCI, I'm seeing 887mV in GPU-Z, and total system 120V AC power consumption is 146W with a cheap 80+ bronze PSU.  My hashrate is 26.1-26.3Mh with an Asus Rx 470 Strix clocked at 1025/1875(1.5Ghz strap).
you can keep default VDDCI (memory controller voltage) and use negative Voltage Offset to reduce gpu voltage below VDDCI ))
nerdralph (OP)
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October 07, 2016, 03:00:24 PM
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you can keep default VDDCI (memory controller voltage) and use negative Voltage Offset to reduce gpu voltage below VDDCI ))

How do you set up a voltage offset in WattMan?
Q_R_V
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October 08, 2016, 08:01:58 AM
 #4

You need WattTool -> Voltage Offset text box, but if it's NA you probably need other BIOS (with unlocked offset).
nerdralph (OP)
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October 08, 2016, 01:45:56 PM
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You need WattTool -> Voltage Offset text box, but if it's NA you probably need other BIOS (with unlocked offset).

Do you know anywhere that has a free and open (no signup required) download of WattTool?
Q_R_V
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October 08, 2016, 05:42:48 PM
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Do you know anywhere that has a free and open (no signup required) download of WattTool?


http://s000.tinyupload.com/index.php?file_id=07775673216110772600
Downloaded from Overclockers few minutes ago.
nerdralph (OP)
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October 08, 2016, 07:45:41 PM
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Do you know anywhere that has a free and open (no signup required) download of WattTool?


http://s000.tinyupload.com/index.php?file_id=07775673216110772600
Downloaded from Overclockers few minutes ago.

Thanks.  Just tried it out, but it says NA for voltage offset.  I don't think it has to do with my BIOS, but rather the custom VRM Asus uses is probably not recognized by the program.
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October 08, 2016, 11:10:34 PM
 #8


  I don't think it has to do with my BIOS, but rather the custom VRM Asus uses is probably not recognized by the program.


You can also try Sapphire Trixx to move the offset, but i am not sure if it will work with custom VRM.
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