https://community.intel.com/t5/Software-Tuning-Performance/How-to-change-the-system-voltage-using-wrmsr-in-Intel-i5-64-bit/m-p/1095612#M5724 <P style="font-size: 13.008px; line-height: 19.512px;">We figured out the voltage by multiplying the value we obtained using the command&nbsp;<SPAN style="font-size: 1em; line-height: 1.5;"><SPAN style="font-weight: 700;">sudo rdmsr 0x198 --bitfield 47:32</SPAN>&nbsp;with (1 / 2^13). But when we tried to change the value of 0x198 &nbsp;we got the following error</SPAN></P> <BLOCKQUOTE style="font-size: 13.008px; line-height: 19.512px;"> <P><SPAN style="font-weight: 700;">wrmsr: CPU 0 cannot set MSR 0x00000198 to "value"</SPAN></P> <P>&nbsp;</P> <P>&nbsp;</P> </BLOCKQUOTE> <P style="font-size: 13.008px; line-height: 19.512px;">But we are not able to figure out how to change the value using sudo wrmsr? Which register should be changed? We disabled the Intel Speed step technology in BIOS.</P> <P style="font-size: 13.008px; line-height: 19.512px;">&nbsp;</P> <P style="font-size: 13.008px; line-height: 19.512px;">Any help will be appreciated</P> Wed, 02 Mar 2016 19:06:38 GMT SP_H_ 2016-03-02T19:06:38Z https://community.intel.com/t5/Software-Tuning-Performance/How-to-change-the-system-voltage-using-wrmsr-in-Intel-i5-64-bit/m-p/1095612#M5724 <P style="font-size: 13.008px; line-height: 19.512px;">We figured out the voltage by multiplying the value we obtained using the command&nbsp;<SPAN style="font-size: 1em; line-height: 1.5;"><SPAN style="font-weight: 700;">sudo rdmsr 0x198 --bitfield 47:32</SPAN>&nbsp;with (1 / 2^13). But when we tried to change the value of 0x198 &nbsp;we got the following error</SPAN></P> <BLOCKQUOTE style="font-size: 13.008px; line-height: 19.512px;"> <P><SPAN style="font-weight: 700;">wrmsr: CPU 0 cannot set MSR 0x00000198 to "value"</SPAN></P> <P>&nbsp;</P> <P>&nbsp;</P> </BLOCKQUOTE> <P style="font-size: 13.008px; line-height: 19.512px;">But we are not able to figure out how to change the value using sudo wrmsr? Which register should be changed? We disabled the Intel Speed step technology in BIOS.</P> <P style="font-size: 13.008px; line-height: 19.512px;">&nbsp;</P> <P style="font-size: 13.008px; line-height: 19.512px;">Any help will be appreciated</P> Wed, 02 Mar 2016 19:06:38 GMT https://community.intel.com/t5/Software-Tuning-Performance/How-to-change-the-system-voltage-using-wrmsr-in-Intel-i5-64-bit/m-p/1095612#M5724 SP_H_ 2016-03-02T19:06:38Z