Low voltage v Normal RAM (Mixing?)

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Hope everybody had a good xmas.
Just bought a couple of 4gb ram sticks off ebay. 1 is the standard 1.5v the other 1.35v.
Just running memtest on them now in my x220.
Any opinions/experience on mixing & matching & advantages/disadvantages of both types? stability etc.
Will the low voltage only work on later model TPs?

Many Thanks

[creshal]

There's a difference between "low voltage" DDR3 RAM (which supports 1.5V by default and 1.35V via separate SPD entry) and DDR3L.

The X220 will work with low voltage DDR3, by ignoring the 1.35V mode and driving it with 1.5V. DDR3L will not work.

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Thanks creshal it passed memtest ok & the appears laptop boots fine with it. it says pc3l or appears to be be ddrl3 not sure

https://www.micron.com/parts/modules/dd ... 8D2969B%7D

Dont want to use it though if their is a risk of damage or stability issues?

[Kasm279]

PC3L/DDR3 Low Voltage modules are designed, per JEDEC, to also support 1.5V operation. Generally they don't mix well with normal-voltage DIMMs, but if it works you should be fine.