SPD Voltage vs Tested Voltage

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andrewf93

Honorable
Feb 12, 2014
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I am having trouble figuring out what is the meaning behind SPD and tested voltages in terms of RAM.

This is what I understand:

Memory straight out of the box runs at the specified SPD speed (stock speed), and requires the SPD voltage.

For Memory to run at its tested speed (rated speed) it must be manually set in the BIOS, and requires tested voltage.

For example,
I was looking at a RAM set, with a SPD voltage of 1.5v running at 1333MHz. Whilst its tested speed was 2400MHz with a voltage of 1.65v.

Now does this mean out of the box, stock speeds with this set would be 1333MHz, and the only way I could reach it's rated 2400MHz speed is to manually set it in the bios, while adding higher voltage.

I would not want to do this as I have read 1.65v is not good for Haswell CPU's (i7 4770k) - If that is the case, I have considered another set.

This set runs at SPD 1333MHz at 1.5v, while its tested speed is 1600MHz with a tested voltage of ALSO 1.5v.

Now out of the box, this would run at its stock speed of 1333MHz, and for me to reach the rated 1600MHz I would still need to manually set it in the bios, HOWEVER will not need to add any extra voltage.

Is what I am saying correct?

And if so, will running 1600Mhz at 1.5v cause any overheating issues for the CPU.

Thanks so much guys, I know this is hard to read but bear with me. I hope it all made enough sense.
 
Solution
EasyLover
Dear,

SPD voltage is 1.5v for RAM. This is what is recommended by the Intel. Saying that 1.65v is not good haswell is a premature statement. When overclocking, we know that we risking and in turn reducing the life of the component(s). Yet still we overclock.

Remember, you'll continue to change the system settings, playing with the multipliers till such time system is stable, beyond system will not be able to perform stably.

So 1.65v in this regard is not that bad. Caution has already been mentioned in previous statements though.

1600MHz @ 1.5v will give normal level of heats. You'll be ok with it or check the RAM with heat spreaders.

Remember, Even if you've installed RAM with high speed, your mobo will limit it to its defaults i.e...
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EasyLover

EasyLover

Splendid
Dec 30, 2013
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Dear,

SPD voltage is 1.5v for RAM. This is what is recommended by the Intel. Saying that 1.65v is not good haswell is a premature statement. When overclocking, we know that we risking and in turn reducing the life of the component(s). Yet still we overclock.

Remember, you'll continue to change the system settings, playing with the multipliers till such time system is stable, beyond system will not be able to perform stably.

So 1.65v in this regard is not that bad. Caution has already been mentioned in previous statements though.

1600MHz @ 1.5v will give normal level of heats. You'll be ok with it or check the RAM with heat spreaders.

Remember, Even if you've installed RAM with high speed, your mobo will limit it to its defaults i.e 1333 MHz. You'll either have to manually change the timings/speed or use XMP Profile 1 to enable faster speed.

People are using 1.65v RAMs with out issues.

Regards,
 
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Solution
Onus

Onus

Titan
Jan 27, 2006
37,037
12
89,965
The standard for DDR3 RAM is 1.5V. The Intel IMC is stressed by voltages above this, though should be safe up to 1.65V. The problem is that sometimes the set voltage and actual voltage can differ, if only by small amounts (e.g. 0.01V). I therefore consider non-standard voltages to be less safe than they may appear. Look for RAM that will run at its rated speed on the standard 1.5V (or less).
 
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