Which ram configuration is better? DDR4 - GT72VR

Which should perform better? The 2133 15-15-15-35 configuration, or the 2400 17-17-17-39?

Thank you in advance

 

usually, the higher the RAM clock speed, the more the CAS Latency, go like I did with the Kingston MSI24D4S7D8MB-16 2400 MHz.(17-17-17-39) 64GB DDR4 RAM

 

Yes, but what is better, higher latency on 2400 or lower latency in 2133?

 

as long as the latency is not crazy high, then go for the higher clock speed. 2400MHz. strikes a good balance between speed vs latency.

this is why that RAM speed is now that standard on all MSI new laptops, Alienware, etc.

I could have gone for 2666 MHz G.Skill RAM on my laptop but it had even higher latency and I didn't wanna have any compatibility issues so I went with the standard 2400MHz that MSI puts on their new laptops

 

One more curious thing is that in the official especifications of the i7 6700hq, Intel only talks about 2133 DDR4
http://ark.intel.com/products/88967/Intel-Core-i7-6700HQ-Processor-6M-Cache-up-to-3_50-GHz
Memory TypesDDR4-2133, LPDDR3-1866, DDR3L-1600

I don't know why is this laptop able to run it on 2400mhz with this processor.

 

I'd go with the Intel recommendation then @ 2133 MHz. I thought you had a Kaby Lake CPU like me

do note, as a user, you cannot feel / tell the difference between 2133 MHz and even 3000 MHz. it will only show the difference in synthetic benchmarks.

Also, you will get lower CAS Latency with the 2133 MHz RAM so all good.

That last thing you want is to get the faster RAM, thinking that it's ok, it runs fine, benchmarks fine, then start getting weird errors or data corruption

 

I've performed benchs on 2400 and 2133 and I can't see the difference. I guess I'll stay on 2133...
Thank you.

 

This was on one of my previous Clevo laptops with a desktop class 6700K

Will you feel the difference in real life? no!

2133 MHz:



2400 MHz:

 

Where were you able to find this memory or is it only available as an upgrade when purchasing the laptop. My GT73VR 7RE came with 1 x 16GB of this memory and I would like to add a second 16GB dimm, I guess if I can not source this I can get another Kingston model with tighter timings but it will be limited to the current modules timings in bios correct?

 

I got it from HIDevolution but only if you buy the system from them they won't sell it separately, it was part of the whole package

And yes, if you get faster timings, you will still be limited to the slowest module. I recommend you swap both and sell the current one you have as it's almost impossible to find that same RAM since it's only available from MSI or resellers usually

 

Exactly what I had thought about finding it. Since this 1 x 16Gb is under the keyboard, I will leave it as is I am not bothering with attempting to remove it. I will do as I did on my GT72 2QE, just add the same make of ram, timings will only be better and system will run at the slowest tiings of the 2 modules, that is the simplest alternative

Last is it actually possible to run a raid 0 array in unit if one has a single EVO as the OS drive and has 2 pair of M.2 drives in the other two slots, that was my original plan but now I dont believe it will work or I am doing something wrong?

 

I thought you had to have the 2 RAM SODIMMs next to each other to get Dual Channel, if you put one underneath the keyboard (stock config) and another under the backpanel, they may not run in Dual Channel Mode.

@Shehary @hmscott @iunlock

 

And you never faced any instability doing this?

 

Nope I never had any stability issues with my previous GT72 2QE 1666, it came with 2 x 8GB of Kingston under the keyboard and I added another 2x8GB to it which had better timings and there was absolutely no issue with the ram running 1600, had even bought ddr3 1866 which ran fine in system as well but I returned it to amazon to save money and just go with some generic kingston of the same 1600 speed

 

Dual channel does requires two dimm slots, clarification would be needed to see if adding a second dimm to the available dimm slots under bottom cover would enable dual channel or whether the unit will continue running single channel. As it stands now I am single channel anyways

 

There are some systems where the Rams had to be in a cross order like:

1 & 3 or 2 & 4...

Running them next to each other is what I would do on the msi.



::iunlock::

 

You need to consult the manual for the laptop / motherboard to find out which sockets are paired.

And, yes, some designs do pair alternate sockets as Dual channel pairs, so you would have one SODIMM in a pair of sockets on one side of the motherboard, and one SODIMM in a pair of sockets on the other side of the motherboard.

As to mixing speed / timing make /model's of SODIMM's / DIMM's, it's a slippery slope. It might work in one MB and not in another.

Spoiler: Bad habit...

It's also a bad habit to expect this to work - faster spec memory matched with lower spec memory, as some server designs are smart enough to match speed per DIMM / Bank and then you get weird **** going on that shows as memory anomalies - and some application software that is memory sensitive will reject running - or have slowdowns / result differences - while the OS appears to be working fine.

This happened with some varying but similar degree and effect at some client sites over the years. Some tech would have experimented with mixing and matching RAM speeds and "it worked fine on my PC", and ordered $XX,XXX-$XXX,XXX of incompatible RAM when paired with existing RAM.

Once their brains "vapor-locked" when confronted getting stuck with $10's or 100's of K's of memory "they now couldn't use", I was called in to solve the problem.

I found the mixed memory problem showed up in the OS quickly - I showed them it's not the application, or the OS at fault, it's the memory mis-match.

They then complained that they couldn't get stuck with all that "bad" memory, and it would cost too much to swap it for the right stuff with the vendor.

The solution of course was simple, match old memory to old memory, and new memory to new memory in the same chassis. Basically pull the servers in pairs, one set after the other, and have a giant memory swap party. Take the old memory from one server and the new memory from the other server, and swap them across the chassis.

Simple solutions are best, match memory, and don't go out of your way to outsmart yourself.

 

You can buy the RAM from most component retailers, just don't look for that specific part number since it's probably labeled specifically for that manufacturer.

Kingston 16GB 2400MHz CL17
https://www.newegg.com/Product/Product.aspx?Item=N82E16820242383

 

Thanks, I figured it was the value ram series and had already added it to my cart on amazon If it was an easier process to access the dimm slots below keyboard i would install there but that is just a hassle w potential issue awaiting. Hopefully dual channel will be achieved and if not its not a huge overall difference anyways

Sent from my ONEPLUS A3000 using Tapatalk

 

You get dual channel - if it doesn't show up just change to another slot. I have one dimm under my GT70 0NE kb (default) and another that I installed into the easy access slot. They are in slot #2 and #3 and work on dual mode. CPU-Z recognized the slots.