ProBook 470 G3 laptop memory upgrade question

[chugbug]

Hello.  I need some help with a memory question.  I just purchased an HP ProBook 470 G3 with Windows 7 Pro (64-bit).  I'm installing an SSD and want to upgrade the memory as well-- it only came with ONE 8GB stick.  

The first question is more like a request for confirmation-- because the memory that's installed is NOT what is listed in any of the specs or the Service & Maintenance Guide.  Those all list it as: PC3L-12800, 1600 MHz, DDR3L.  But the memory stick itself is labeled DDR4.  I also verified it with CUPZ and it's shown as DDR4 as well (DDR4-2400).  My guess is they upgraded the laptop, but not the manuals.

Here are some links I found with information on the hynix stick that's installed:
https://www.compuram.biz/memory_module,hma81gs6afr8n-uh,hynix.htm
https://www.skhynix.com/products.view.do?vseq=1725&cseq=75

Question #2 (this one IS actually a question):  CPUZ lists the stick as SINGLE channel.  So can I purchase anohter 8GB stick and install it, or would it require replacing BOTH to upgrade to 16GB (2 x 8GB)?

Then if I look for a SINGLE stick, will it be SINGLE channel?  I looked for some on Newegg, but they don't seem to list whether it's single or dual channel.  If it sold as a single stick, can I assume it's SINGLE channel?  They also have what seems to be TWO different 8GB DDR4-2400 Crucial stick, but with a wide gap in their pricing ($63.99 vs $86.99).   I've purchased and installed a lot of memory in my time, but I'm not familiar yet with DDR4 to know what to choose.

$63.99 memory # CT8G4SFD824A (newegg # 9SIA24G4NE5152)
https://www.newegg.com/Product/Product.aspx?Item=9SIA0ZX4SV0368

$86.99 memory # CT8G4SFS824A (newegg # 9SIA1K64N62581)
https://www.newegg.com/Product/Product.aspx?Item=9SIA1K64N62581

Can anyone offer some guidence?  I should note that I don't do any gaming that requires really fast memory, so if I can just go with a single stick, I'd be satisifed (especially with the SSD).

Thanks...JEB

[Huffer]

As long as you get a second 8 gig stick of DDR4-2400 RAM and install it you will have 16 gigs and it will be dual channel. Any single stick of memory will be single channel because it is in one channel. A second stick of the same memory (or with all the same characteristics-speed density latency)-will allow dual channel memory operation as long as the motherboard supports it which your does. I have a Zbook 15 G3 which is very similar. Came with a single 8 gig of DDR4-2133. I went to Frys and bought what they had on hand for an 8 gig DDR4-2133 chip, installed it and mine is running in dual channel mode. 

I am also not seeing any difference between the $64 memory and the $87 memory other than price. You can install either one of those as they have the same salient specs as the Hynix installed in your laptop now. 

Good luck

[REO51ST]

@chugbug

Just wanted to chime in with a question.

Are you sure you have a 470 G3  or  is it a 470 G4.

REO

[Huffer]

@REO51ST excellent question...the G4 uses DDR4-2133 memory, but HP may have installed DDR4-2400 and it is downclocking. Here is the G4 Manual:

Manual

[chugbug]

Hi Reio,  thanks for taking the time to post.  YES, I'm sure it's a G3.  That is the box says it is.  I also looked it up on the HP Support site by the SERIAL number instead of just the model number to make sure I had the right laptop.

BUT, you may be on to something... I looked up the 470 G4, and the manual for that one says it takes DDR4.  Although it lists it as  PC4-17000 instead of the PC4-19200 that's in mine.  Maybe it's a "G3.5"-- something  made in between.  

That may also be why a few SoftPaqs had trouble installing too.

Thanks again for the post...JEB

[chugbug]

Thanks for the information.  Guess I'll buy the cheaper one then.