Looks like i have 4 slots, By default its installed with 2 8GB sticks of 800 MHz on slot 2 & 4. Slots 1 & 3 are free.

Can i install another 2 sticks of 8 GB with 1600 MHz? Or does it need match freq on all 4 slots?

Your memory instelled is 1600mhz 1.35V! Manufacturer Hynix 8Gb per slot https://www.skhynix.com/products/computing/view.jsp?info.ramKind=20&info.serialNo=HMT41GS6AFR8A
The best way to upgrade ram is to buy same manufacturer and same frequency and voltage ram sticks. Because adding ram with another parameters like frequency and voltage is DANGEROUS and may DAMAGE your laptop or system may start BSODing! This ram is good enough I have the same Hynix sticks running good. Search shops I think you can find same sticks at your local store.
P.S. Before installing a new ram turn off your laptop remove battery and hold power button for 30sec.

Hi Code,

i wasnt able to find Hynix brand in any local stores. Looks like to i have to choose another brand.

This is what i have found :

Crucial 16GB Kit (8GBx2) DDR3/DDR3L 1600 MHz (PC3-12800) CL11 SODIMM

Pls let me know if the above RAM would fit in well with the spec?

The spec states it ll work with 1.35/1.5V? Is that okie or i should choose specifically?

Thanks

Guys, it is best for compatibility to add the same make/model of memory, and the Hynix make is readily available everywhere as PC / Mac is made with them. I got my 4th SODIMM from an ebay listing for pulls from Macs. It worked right off, and is the same as the other 3 SODIMM's that came with my G750JH.

In order to get an advantage in memory over the stock make/model you would need to replace all 4 SODIMM's with 4 of something better, like a 2133mhz DDR3L SODIMM, which work at full speed in the G750.

It isn't predicable whether the Crucial memory you are looking at is compatible, it might work ok, it might not, why take the chance to save a few bucks? You might end up installing it and then you have problems later and you waste a bunch of time debugging them, only to find that when you remove the new memory the problems stop. Then it will be to late to return - past 15 day return window - and you are stuck with them, and then need to go and buy the original make/model anyway.

IDK what it is, but there is a huge desire to use anything other than the stock memory, we see it all the time. Even though it isn't as good, and has the same specs, just to save a couple of bucks people will chance it. If you have that urge, resist it, there are lots of stories of people having problems with mixing non-stock make/model memory in the past. Look at the memory sticky thread in the G750 forum.

Speaking of, we really should be having this conversation here, in the G750 memory sticky thread 🙂

Read this thread, starting with the newest, and/or jump around for fun reading.

Upgraders: 1.35V memory is required!
http://rog.asus.com/forum/showthread.php?33744-Upgraders-1-35V-memory-is-required!&p=272284&viewfull...

Get the stock memory, it's worth it 🙂

In past I replaced whole stock 8gb 1333mhz ram in asus g74sx by Kingston hyperx 1600mhz 16gb 4gb per slot it works fine for 2 years without any issues! I use to add 2 Samsung 8gb ram sticks to my friends g75 at stock he had Hynix ram 2x4 + 2x4 Samsung! Everything forks fine for 2 month. But I hadn't experimented with my g750jw I only added a same stick as was installed in stock. No one cant give you 100% warranty how will your laptop work when you add another ram from another brand! "In theory" the matching parameters should work fine but on practice they may not! It's a lottery! There is plenty of Hynix ram on ebay: http://www.ebay.com/sch/i.html?_odkw=asus+g750&_from=R40&_osacat=0&_from=R40&_trksid=p2045573.m570.l...
Try to find matching ram.

Hey thanks guys for your kind piece of inputs. Appreciate your help on this.

I will go ahead and order similar Hynix stock model.

I will keep you posted if I run into any issues.

Have a great weekend !!

- Reck