HP Pavilion 15 memory upgrade

[lukiluke]

Hello everyone.
I own a laptop HP Pavilion 15-e073ea and I'd like to buy additional RAM. The memory I have installed now is Kingston HP16D3LS1KBG/4G.
As I cannot find such memory in any shop in my country, I'd like to know what other memory get I install?
I found two similar RAM modules in my local shop and these are:
1) Kingston 4GB [1600MHz DDR3 Non-ECC CL11 SODIMM 1.35 V (http://www.komputronik.eu/product/223410/Electronics/PC_parts/Kingston_4GB_1600MHz_DDR3_Non_ECC_CL11...
2) Kingston 4GB [1600MHz DDR3 Non-ECC CL11 SODIMM SRx 8 (http://www.komputronik.eu/product/187564/Electronics/PC_parts/Kingston_4GB_1600MHz_DDR3_Non_ECC_CL11...

Is there any significant difference between these models? Should I buy on of these or maybe some other?
I saw that my memory has written 1Rx8 on it if that has a meaning.

Regards, Lucas

[Huffer · Accepted solution]

This is what you have now:

http://www.amazon.com/Kingston-PC3L-12800S-11-11-B3-HP16D3LS1KBG-4G-Laptop/dp/B00N6WKI3S

The key thing here is that it is high density (4 black blocks) and low voltage (1.35 volts) 1600 mhz 

The first link you gave says the memory can run at 1.35 or 1.5 volts, which is true for all low-voltage memory but it does not work the other way around. 1.5 volt memory cannot run at 1.35 volts. 

So it looks like the first memory you linked will work, but I cannot be sure on the second; it does not state the voltage. I would avoid it. 

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