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<LENOVO> Thank you for choosing Lenovo sales chat. I’m Ryan, your sales chat representative. My rep id is 2900710106. What can I do for you today?
<LENOVO> how are you today?
<ME> Hi, thanks for helping me today
<ME> I wanted to upgrade the RAM in my e430 from one 4GB SIMM to two 4GB SIMM's. Not sure if it matters, but I have the E430 with the i7-3612QM processor. When I went to Crucial to check out the options: http://www.crucial.com/store/listparts. ... 30&Cat=RAM I saw that the RAM came in two different voltages -> 1.35V and 1.5V How do I chose? Any suggestions?
<LENOVO> great questions, let me check
<ME> Thank you!
<LENOVO> this is the memory you need in the PC
8GB max7 / PC3-12800 1600MHz DDR3, non-parity,
dual-channel capable, two 204-pin SO-DIMM sockets
* System automatically clocks down for processors with 1333MHz DDR3 memory controller
<ME> Ok, but should I get the 1.35V or the 1.5V version of that RAM?
<LENOVO> what is the 4 Digit machine type # on the bottom of your PC?
checking through machine type
Sorry the machine is in transit to my house, hasn't been delivered yet.
<ME> It's the latest e430 with the 3rd gen i7 cpu.
<LENOVO> can you re-send me that link
http://www.crucial.com/store/listparts. ... 30&Cat=RAM
I am not able to pull up the crucial
<ME> Did that work?
<LENOVO> get the 1.5
that should work
<ME> How do you figure? Why not the lower voltage 1.35v? What does the e430 actually come with?
<LENOVO> per the specs on the E430 the 1.5 is the voltage on that memory that is installed in the machine
so you should be good with the 1.5
<ME> Thank you so much!
<LENOVO> your welcome!

What is Dual-Voltage RAM?

Voltage refers to the power consumed by a module. In the past, most DDR3 memory voltage ranged from1.5 - 1.65v. More recently, dual 1.35/1.5 voltage modules came available at Crucial.com.  While the lower voltage memory has some advantages over high voltage (namely lower power consumption), your system must support it in order to realize the benefits.
Will the dual voltage 1.35V/1.5V parts work with my original memory?

If your original installed memory is 1.5V and you are adding a dual-voltage 1.35V/1.5V module to an open DIMM slot, the dual-voltage module will operate at 1.5V, not 1.35V.  In order to run at 1.35V, all installed memory modules must be dual-voltage 1.35V/1.5V and the system must support DDR3L (1.35V low voltage) to enable the module to run at 1.35V.
Which is better; 1.35V/1.5V or 1.5V?

Generally, lower voltage is optimal as it consumes less power and in turn, may generate less heat.  However, it is important to note that the overall system must support DDR3L (1.35V low voltage) to enable the module to run at 1.35V.  If the system does not support DDR3L (1.35V low voltage), the module will run at 1.5V.
Which one should I buy; 1.35V/1.5V or 1.5V?

Purchase whichever of memory your system supports, but keep in mind the dual-voltage module will run only run at 1.35V if your specific system supports that voltage, otherwise the memory will run at 1.5V.