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RAM voltage is set in the base nvram file maintained in the EFI firmware. For those using DDR3L, It should be possible to lower the Mac pro’s voltage settings for the ram allocated to each CPU.

SET_PROPERTY (class="Sensor"&location="VM1S") [low-limit="1.43",high-limit="1.57",type="Voltage",description="PP1V5_S3_MEMA Voltage"]
SET_PROPERTY (class="Sensor"&location="VM2S") [low-limit="1.43",high-limit="1.57",type="Voltage",description="PP1V5_S3_MEMB Voltage"]
 
RAM voltage is set in the base nvram file maintained in the EFI firmware. For those using DDR3L, It should be possible to lower the Mac pro’s voltage settings for the ram allocated to each CPU.

SET_PROPERTY (class="Sensor"&location="VM1S") [low-limit="1.43",high-limit="1.57",type="Voltage",description="PP1V5_S3_MEMA Voltage"]
SET_PROPERTY (class="Sensor"&location="VM2S") [low-limit="1.43",high-limit="1.57",type="Voltage",description="PP1V5_S3_MEMB Voltage"]

seems like a plan, but I shall leave mine as is, nice and cool and fast enough, ram voltage is never 100% stable anyway, even on my PC water cooled monster it does vary and ram voltage is prime for stability. but if your on the 1.35v DDR3 then must be worth a shot, run mem test in windows for 24hrs and if it don't show errors or fail the tests then I would say good to go.
 
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