What is your IMC voltage set at? I just installed my new DDR3-2133 1.5 volt RAM. All I did was enable XMP and everything is working great. However, in the BIOS, the stock IMC voltage is reported at 0.8xx volts. When I am in Windows and load HWiNFO64, it reports the IMC voltage as 1.001 volts. The IMC voltage option is set on "Auto" in the BIOS. Did the motherboard automatically bump-up the IMC voltage for the higher speed 2133 MHz RAM? I've noticed my CPU temps have increased about 3-4 C.
Yes , that is normal. On AUTO, the motherboard will raise IMC Voltage as necessary to support the DRAM. Higher quality motherboards like ones specifically for extreme overclocking will be much better for this, meaning they can AUTO supply sufficient Voltage. But up to a certain amount, the user must manually input a value for full stability and to have a smaller range of fluctuation for reliability.
Since you know roughly how much the IMC needs for DDR3-2133, you can manually input a fixed value of 1.00V, or leave to AUTO and allow it to change frequently.
Is 1.001 volts a safe voltage for the IMC? Hope it won't start degrading the CPU quicker. Is it also normal for CPU temps to go up slightly with increased IMC voltage?
Yes, no problem at all. IMC is in the CPU, so temps will go up as you increase voltage. Increasing RAM frequency and capacity will both cause more load on the IMC, as a result more voltage. It is all perfectly fine, imagine 64GB DDR3-2400+
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