Hardware Looking for a new RAM for my laptop(few questions more advices appreciated)

[Jayro]

If I ever fall into some unexpected money, I might go for 64GB of G.Skill RGB myself... (I use ramdisks and Photoshop, and my 32GB is a bit limiting)

 

[gengardenne]

I Think to have solved at the end,because the RAM I'm going to purchase was exactly like the pre-installed on my pc but has 8 GB instead of 4GB.
The answer is really simple: PC3-12800 mean 1600MHz while the DRAM frequency is always the half of this so if both are PC3-12800 and the first has 1600MHz also the second will have 799.9 like frequency.
Both are also DDR3 but the new one is DDR3L but would be compatible becuase them are the same and the voltage is always 1.35 V like the first so is exactly the same(also the brand is egual XD)

 

[gengardenne]

I have 2 last questions to complete this thread from some lacunes:
1 Can I use two RAM with different voltage? 1.35 V and 1.5 V for example (think to have solved that)
2 What mean memory structure 1X4GB? Your computer accept only RAM of this size?