Voltage higher then maximum -Gaming PC

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jangofett234

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Im getting my first gaming PC and using pcpartpicker.com as a guide and I got a notice saying the 16gb of ram is going to run at 1.65 volts and that "exceeds the Intel Haswell CPU recommended maximum of 1.5V+5% (1.575V)". So my question is how do you lower the voltage so as to not break the RAM.
 
Solution
nukemaster
You would lower it in the bios. The problem is sometimes you can lower it to 1.5(or 1.575) without issues and other times, the memory speed will have to be lowered or the timings loosened.

Best bet would be to get ahold of some 1.5 volt or lower memory.
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nukemaster

nukemaster

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You would lower it in the bios. The problem is sometimes you can lower it to 1.5(or 1.575) without issues and other times, the memory speed will have to be lowered or the timings loosened.

Best bet would be to get ahold of some 1.5 volt or lower memory.
 
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jangofett234

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@nukemaster, so the same 16gb memory but in 1600 MHz is better then the 2133 MHz? The 2133 MHz is rated at 1.6 volts as stated and the 1600 MHz is rated at 1.5 volts. Will down grading the MHz from 2133 to 1600 cause lost performance in the system?
 
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nukemaster

nukemaster

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You can see a full test of memory performance on Haswell systems here

Chances are that 2133 rated at 1.6 will do 1600 or 1866 at 1.5 with ease.

I am just going with the recommendation on the board/cpu makers.

Hell many boards have 1.65 volt memory certified for use anyway. I used 1.65 volt memory on the first and second generation i5/i7's without any issues at all(even on a 24/7 system).

The 1.575 comes from Intel's own spec sheets.
Processor I/O supply voltage for DDR3
min : 1.425 (used 1.35 my self :) )
Typical : 1.5
Max : 1.575

Dig a bit deeper and you may notice the following.

Absolute Maximum and Minimum Ratings
Processor I/O supply voltage for
DDR3 with respect to VSS
Min : -0.3(i love negative voltage)
Max : 1.80 V

I would NEVER feed 1.8 volts, but it is in the specs(at least for the older chips.)

EDIT, the data sheet for the new cpus does not seem to list an absolute max.
 
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