memory for friend's Macbook Pro - discrepancy in voltage of req'd RAM

[Turbonium]

My friend is looking to upgrade the RAM in his Macbook Pro.

Crucial.com recommends this.
(1.35V)

NCIX.com has this
(virtually the same, but 1.5V)

Which of the above is this Macbook Pro supposed to take, technically speaking?

As far as I understand it, using RAM rated at a lower voltage than it's designed for can lead to reliability issues, but no damage. However, running RAM at a voltage higher than it's rated at can cause both reliability and damage issues.

So in other words, the RAM off of NCIX should be just fine, assuming no stability issues (i.e. assuming the motherboard in the machine runs at 1.5V and not 1.35V). Someone please clarify. I basically need to know what the motherboard in the machine officially supports/runs at.

EDIT: some sources report that DDR3 SoDIMMs advertised at 1.35V simply mean they can run with that much voltage at the advertised speed, but that doesn't mean they can't run perfectly fine at 1.5V. Can anyone confirm this?

 

[ch33zw1z]

If the RAM is rated for 1.35v, then running it at 1.35v will be fine.

DDR3 came out at 1.5v-1.65v IIRC, a lower voltage JEDEC staandard was introduced at 1.35v a little while later...to reduce power comsumption for large quantities of RAM.

I just went from a 2x2GB 1.5v, to a Crucial 2x4GB 1.35v set in a Lenovo T410. CPUZ shows it running at 1.35v, no problems yet.

If Crucial says it's compatible, then hold them to it I've had good luck with their memory finder, no issues so far...

 

[z28dreams]

For what it's worth, I ended up using 1.5v RAM in my 2011 macbook pro instead of the recommended 1.35v because I got it for about 1/2 the price.

I've benchmarked both in xbench/geekbench and saw no major performance difference. (In fact, if anything, the 1.5v stuff is actually running a bit faster).

I'm not sure how much battery life I'm giving up by using an addition 0.15v x 2 sticks, but I can't imagine it's that much.

 

[ch33zw1z]

cool, thanks for the update

I doubt the battery life would be noticeable.