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360 Posts

02-19-2015

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  • Message 21 of 25

Re:Thninkpad p50 16 GB ram upgrade to 32GB

2020-10-21, 0:51 AM

Thank you.

 

I currently have this installed in my laptop: https://www.samsung.com/semiconductor/dram/module/M471A2K43BB1-CPB/ (https://memory.net/product/m471a2k43bb1-cpb-samsung-1x-16gb-ddr4-2133-sodimm-pc4-17000p-s-dual-rank-x8-replacement/)

 

Cnet says it has timings of "CL15 (15-15-15)"

 

Would mixing it with Crucial Ram that has CL17 (https://www.crucial.com/memory/ddr4/ct16g4sfd824a/ct7977049) be an issue?  Would it provide dual-channel operation?

 

I'm sorry but I really don't know what to look at/for.

 

https://notkyon.moe/ram-latency.htm seems to say there is a minor difference of 14.0646976 nanoseconds (samsung) vs 14.1666666 (corsair) in latency, but I don't know what this means.

 

Does "dual ranked" (on the 16GB chips) vs "single ranked" (8GB) matter?

-----------IBM T40: XP PRO SP3, 14.1" 4:3 display, 512MB DDR RAM, 40GB HDD, ThinkLight, DVD.
Lenovo Ideacentre H215: AMD Athlon II X2 215, 500GB HDD, 4GB DDR3 RAM, 64-bit Win7, AMD 760G.
P50 i7, M2000M, 1x16GB RAM, 1080p, 512GB SSD, 500GB HDD, Backlight, 7Pro.
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2814 Posts

06-13-2013

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  • Message 22 of 25

Re:Thninkpad p50 16 GB ram upgrade to 32GB

2020-10-22, 23:14 PM

As far as single-ranked (8GB) vs. dual-ranked (16GB): A single-rank DIMM has one set of memory chips that is accessed while writing to or reading from the memory. A dual-rank DIMM is similar to having two single-rank DIMMs on the same module, with only one rank accessible at a time. Only one rank is accessible at a time. The server memory control subsystem selects the proper rank within the DIMM when writing to or reading from the DIMM.

 

In other words, don't worry about it. Doesn't affect you. Just a matter of storage "density" on the card. You're buying a card with 16GB on it, so it's dual-rank, which is really like having 2 8GB cards on the one 16GB card. An 8GB size memory on the card would only have the one 8GB need, hence single-rank.  Again, don't fret.

 

As far as using the 1x16GB Crucial memory CT7977049 to add to your existing Samsung memory, the original memory is DDR4-2133Mhz. This matches the memory speed supported by the BIOS and chipset on the P50. Any additional memory that purportedly is faster (e.g. 2400 Mhz or 2666Mhz will simply be slowed down to match the slowest memory you already have installed, i.e. 2133Mhz. The Crucial memory is GUARANTEED (by Crucial) to be 100% compatible with your existing memory.

 

I believe it's difficult to compare 2166Mhz CL=15 memory with 2400Mhz CL=17 memory, but apparently that web site you found did do the calculations. Very very tiny difference, but I think the outcome says the Crucial memory is actually a tiny bit "faster". Again, don't fret. You cannot possibly ever notice the difference yourself.

 

Compatibility, and dual-channel mode performance... that's what you want. And your second 1x16GB Crucial memory is a "100% match" for your current 1x16GB Samsung memory. You will end up with a 2x16GB=32GB machine running in dual-channel mode, at DDR4-2133Mhz speed. That is what the P50 allows, and the Crucial memory is perfectly fine.

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360 Posts

02-19-2015

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  • Message 23 of 25

Re:Thninkpad p50 16 GB ram upgrade to 32GB

2020-10-26, 23:52 PM

Thank you ever so much for your kind answer (as always) and for the detailed explanation! I learn a lot from talking to you, and greatly appreciate it! :D

-----------IBM T40: XP PRO SP3, 14.1" 4:3 display, 512MB DDR RAM, 40GB HDD, ThinkLight, DVD.
Lenovo Ideacentre H215: AMD Athlon II X2 215, 500GB HDD, 4GB DDR3 RAM, 64-bit Win7, AMD 760G.
P50 i7, M2000M, 1x16GB RAM, 1080p, 512GB SSD, 500GB HDD, Backlight, 7Pro.
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360 Posts

02-19-2015

United States of America

483 Signins

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  • Posts: 360
  • Registered: ‎02-19-2015
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  • Message 24 of 25

Re:Thninkpad p50 16 GB ram upgrade to 32GB

2021-07-21, 0:56 AM

I'm sorry to bring this up again.  I still haven't purchased RAM.  The probable scenario now is that I buy a set of matched RAM (2x16GB), remove the existing stick (1x 16), and put both new sticks under the keyboard when I do the other maintenance.

 

You stated,

@ DSperber wrote:

As far as using the 1x16GB Crucial memory CT7977049 to add to your existing Samsung memory, the original memory is DDR4-2133Mhz. This matches the memory speed supported by the BIOS and chipset on the P50. Any additional memory that purportedly is faster (e.g. 2400 Mhz or 2666Mhz will simply be slowed down to match the slowest memory you already have installed, i.e. 2133Mhz. The Crucial memory is GUARANTEED (by Crucial) to be 100% compatible with your existing memory.

 

Since I would not have any "existing" RAM (after replacing it with matched new RAM), and since Crucial no longer sells 2133 RAM, would there be any benefit to getting a matched set of DDR4-3200 vs a matched set of DDR4-2400?  
I guess, can the motherboard/chipset run RAM faster than the rated speed of 2133 of the original stick, or is everything faster than 2133 (eg 2400) throttled down to the original 2133, regardless of the fact that all of the RAM is that same faster number?

 

The reason I am asking is this: If everything (even matched sets replacing the existing RAM) faster than 2133 will be throttled to 2133, and since slower MT/s RAM also has lower CAS latencys (https://www.crucial.com/articles/about-memory/difference-between-speed-and-latency), the DDR4-2400 (when throttled to 2133) would--if I understand correctly and I ask you to correct me if I am wrong--not only be "faster" (because of the lower latency) than DDR4-2666 throttled to 2133, but it would also save money on an unnecessary expense.
If, however, DDR4-3200/2666/2400/etc would run in my P50 at the rated speeds, I can see upgrading my purchase to DDR4-2666 or DDR4-3200.

 

Further, is there any benefit to getting the "Ballistix" series of Crucial RAM for the lower CAS Latency?  (https://www.crucial.com/memory/ddr4/bl2k16g26c16s4b/ct16704832 vs https://www.crucial.com/memory/ddr4/ct2k16g4sfd824a/ct7977024) Would it fit with the heat spreader?  I know Crucial says it is compatible with the motherboard, but it looks thicker and I don't want to waste my money purchasing something that won't fit in my P50!  Some websites also state that this runs at 1.35V instead of the 1.2V of the original Samsung RAM and the Crucial 2400 RAM.

Also, does the UEFI-only BIOS have access to XMP?  I did not see it in my legacy-first BIOS (I assume it doesn't exist?), and really don't want to wipe my system and rebuild it with a UEFI -only BIOS (if such a thing is even possible)
.

 

Thank you again!

-----------IBM T40: XP PRO SP3, 14.1" 4:3 display, 512MB DDR RAM, 40GB HDD, ThinkLight, DVD.
Lenovo Ideacentre H215: AMD Athlon II X2 215, 500GB HDD, 4GB DDR3 RAM, 64-bit Win7, AMD 760G.
P50 i7, M2000M, 1x16GB RAM, 1080p, 512GB SSD, 500GB HDD, Backlight, 7Pro.
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4280 Posts

12-02-2007

United States of America

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  • Message 25 of 25

Re:Thninkpad p50 16 GB ram upgrade to 32GB

2021-07-21, 5:02 AM

Hello,

 

The RAM would run at the fastest speed recognized by the ThinkPad P50's chipset, 2133MHz.  The advantage of purchasing faster memory is that it could be recycled and re-used in a subsequent computer purchase that recognized the higher speed.

 

I'm afraid I do not have any idea about heat spreader clearance on the Crucial Ballistix gaming RAM.

 

Regards,

 

Aryeh Goretsky

 



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