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My Pavilion x360 notebook has 2 memory slots. Only one slot is used, it has a 8GB DDR4-2400 SODIMM.
Max allowable memory is 16 GB.
I can buy a single 16 GB 3200 module and replace the existing module, or just add another 8 GB module (either 2400 or 3200) in the empty slot.
Is there a preferable configuration in order to get best performance?
Thanks
Is there a preferable configuration in order to get best performance?
2 8GB are better then 1 16GB as it gives you dual channel transfer of data
Is there a preferable configuration in order to get best performance?
2 8GB are better then 1 16GB as it gives you dual channel transfer of data
It might give you dual channel mode, most often with Desktops and enthusiast motherboards, less frequently in notebooks/portables.
Irrespective of dual-channel capability, adding 8Gb of memory WILL increase operating system performance. Cas Latency (Lower is better) by default on the DDR-2400 RAM over others on the Crucial site.
(!) FYI: According to the links posted by Paul-T, both HP and Crucial recommend that an update to the latest bios firmware is made PRIOR to installing additional RAM. Worth checking…
Enjoy the OS/ App reponsiveness/ speed boost!
One very important consideration if you decide to add an additional 8GB SODIMM.
While a difference in speed/CAS probably shouldn’t cause problems (Linus Tech Tips video Just how bad is mixing memory?), to avoid compatibility issues between the existing memory and the new memory, I’d recommend the new stick be from the “same manufacturer” and “same model family” as the existing stick.
BTDT, and discovered the hard way, that two 8GB sticks from two different manufacturers (even though they were the same size and speed) did NOT play well together!
Also, if you intend to use dual channel mode, the sticks need to be a matched set (i.e. same manufacturer, same model, and same speed).
In the past, I have had most success buying a matched pair of sticks.
I haven’t replaced HP RAM in years, but when I did there was a case that required HP memory.
And that 2 modules might provide dual channel transfers.
According to HP, the Pavilion x360 notebook supports dual channel.
Upgrade RAM on my laptop HP Pavilion x360
So, as long as the two sticks are a “matched set”, you’ll get the extra memory speed without having to do anything special (i.e. the BIOS will automatically detect the matched memory and run it in dual mode.)
The service manual with instructions on how to R&R the memory (pages 61 – 62) is available here in pdf format.
Note: the manual also contains the “Update BIOS before adding memory modules” warning @Microfix mentioned.
A quick scan suggests mentions of dual channel are missing from both service manuals offered here.
Your ‘according to HP’ seems to be the suggestion of a forum volunteer on the HP support site, not anything definitive or officially from HP.
If the Crucial site had stated Dual channel was possible with their tested RAM then I’d have believed them as I’ve seen their similar statements in the past about Dual channel/double the OEMs amount of memory, etc. that’s been correct.
Are you saying Cas Latency is better on the DDR 2400 than on the DDR 3200?
No, just not by ‘default’ but by ‘design’ as the DDR4-3200 CAS timings will be reduced to match DDR4-2400 for overall working compatibility.
Glad to read you have opted for a dual-memory kit as spare RAM comes in handy elsewhere in time and places.
I also prefer to change both tyres across an axle for daily drivers 
It’s a portable so ‘overclocking’ RAM will be limited to selecting XMP choices if you’re lucky, the 3200 would probably only be able to run at 2400 (with lower CAS latency) in that machine anyway.
Crucial’s prices for 2400/3200 are the same here, the 2400 being close to the original spec (older) and the 3200 are newer (design/parts) but fully compatible. Actual performance differences would probably be minimal to none.
Even if the machine had a decent BIOS/UEFI that allowed freedom to overclock, choosing and benchmarking for the ‘best/fastest’ RAM speed/latency would be a very long procedure that would show mixed benefits that would be barely worth the effort involved.
14m-cd0003dx
The HP manual (3rd one listed in this thread?) for your rig does claim dual channel support and gives further (probably outdated given the ?default? DDR4-2133!) specifics related to memory:
Memory
Two SODIMM memory module slots, non-customer-accessible/non-upgradable
Supports up to 12-GB of system memory
DDR4-2400 dual channel support
DDR4-2133 dual channel support
Supports the following configurations:
NOTE:
32-bit operating system support up to 4 GB.
●
12288 MB (8192 MB × 1 + 4096 × 1)
●
8192 MB (8192 MB × 1)
●
6144 MB (4096 MB× 1 + 2048 MB × 1)
●
4096 MB (4096 MB × 1)
But it looks like Crucial lists the same pairs of RAM for this machine as those listed above: http://www.crucial.com/compatible-upgrade-for/hp-compaq/pavilion-x360-14m-cd0003dx
I knew that, same link that I posted in https://www.askwoody.com/forums/topic/memory-upgrade-5/#post-2616626 and same RAM pairs that I’d previously linked as well.
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