12-11-2017 04:05 AM - last edited on 12-11-2017 11:38 AM by richk
Fixed typo in subject line - mod
Hello everyone, I need to ask you a question about ram voltage of a t440p. It came with 4gb, and wanted to change one slot to a bigger memory module.
Techincal data say this laptop uses ONLY DDR3L (1.35v) because of the Intel i5-4300 (which also states this in its tech sheet).
My question arised when I opened the backplate and found there are already 2x2gb modules of DDR3 (1.5v) working in it. When searching for data sheets of the rams, both work only at 1.5v.
What's happening? I really don't underestand if they are running in a lowered voltage state, or why they are working at all.
Here's one of the modules
Thank you in advance
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12-11-2017 06:13 AM
Is this a second hand T440p? (I don't recall Lenovo installing Kingston Value RAM modules in ThinkPads...)
Basically there is nothing you should worry about, a T440p can use both 1.35v and 1.5v RAM if I remember correctly. And 1.5v RAM can also run at 1.35v.
If you plan to upgrade your RAM I would remove those modules (they're Kingston's cheap RAM line) and install 2x 4GB or 2x 8GB (the latter is the max RAM supported by this model).
12-11-2017 06:33 AM - edited 12-11-2017 06:36 AM
Yes a second hand. It has a Kingston and a Micron.
Which according to its Datasheet also run at 1.5v.
So you say that they are working at 1.5v? Why does all tech related specs about the gen4 and t440p say only support ddr3l? I was really confused to be honest. In the end will be the same which one do I get to upgrade (1.35-1.5v)?
12-11-2017 06:49 AM
So you say that they are working at 1.5v?
In the end will be the same which one do I get to upgrade (1.35-1.5v)?
Yes, 1.5v RAM is backwards compatible. The advanges of 1.35v are the lower power consumption/less heat, I'd still recommend to buy 1.35v RAM (but if you also find a good very good deal for 1.5v RAM go for it )
I'm (re)using 1.5V ram in a L540, same generation as yours without any issue.
12-11-2017 08:34 AM
Some 1.5V RAM will work at 1.35V and some will not.