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Going to 24GB of RAM on my W540, does orientation make a difference?

W530/W540/W550 series specific matters only
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CharlieDog
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Going to 24GB of RAM on my W540, does orientation make a difference?

#1 Post by CharlieDog » Mon Jan 13, 2020 4:16 pm

All four sticks are Samsung, PC3-12800S, CL 11, 1.35v, the only difference is there is a matched pair of 8GB sticks installed now and a matched pair of 4GB sticks on the way. Does it make a difference how they are installed in the four slots? For now, the two 8's are opposite each other and are the ones a person sees when removing the cover, with two empty slots underneath them. According to Speccy they are in slots #1 and #2, but according to CPU-Z they are in slots #2 and #3. Does it really make a difference? TIA
Larry aka CharlieDog
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Re: Going to 24GB of RAM on my W540, does orientation make a difference?

#2 Post by theterminator93 » Mon Jan 13, 2020 5:18 pm

Ideally the 8s and 4s would be installed in pairs in the same channel, for symmetrical dual-channel configuration. Asymmetrical dual channel is supported in many cases but doesn't offer a consistent speed for all memory addresses.

From what I can tell..... each color is a single channel. So you'd want the two 8s in the top so there's one in the white and one in the black slots, then mimic that for the bottom.
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CharlieDog
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Re: Going to 24GB of RAM on my W540, does orientation make a difference?

#3 Post by CharlieDog » Mon Jan 13, 2020 9:29 pm

Thanks for the reply. I've removed the cover and the two 8GB sticks, and I need to ask you, where should I be looking for this black or white you mention? Sorry, but I don't see it?
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Re: Going to 24GB of RAM on my W540, does orientation make a difference?

#4 Post by theterminator93 » Mon Jan 13, 2020 11:17 pm

Very possible it's just certain motherboards that have it? In any case each pair of slots - towards the front and rear - should contain one each of each memory channel.
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Re: Going to 24GB of RAM on my W540, does orientation make a difference?

#5 Post by RealBlackStuff » Tue Jan 14, 2020 4:10 am

Bookmark this: https://forums.lenovo.com/t5/ThinkPad-P ... a-p/249257
Should also apply to W520/W530/W540
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Re: Going to 24GB of RAM on my W540, does orientation make a difference?

#6 Post by Tasurinchi » Tue Jan 14, 2020 11:58 am

I don't think it matters which slot.

My W540 has also 24GB, because I'm using 3x 8GB RAM modules, since one of the slot closing mechanism is slightly defective.

I can't remember though which one I left without RAM, I can take a look later when I'm back at home.
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CharlieDog
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Re: Going to 24GB of RAM on my W540, does orientation make a difference?

#7 Post by CharlieDog » Tue Jan 14, 2020 2:25 pm

Another thank you to all who have responded to my original post. The more research I do into this search, the more confused I get. There doesn't appear to be consistent numbering of the slots. Depending on the software I use-CPU-Z, Speccy, HWiNFO64, or Crucial Scan, I might have the two 8GB sticks now in slots 2+3, 1+2, 0+1, or in a photo on the Lenovo forum labeled 1+4.

It would be funny if it wasn't so frustrating.

I moved the two 8's to the two slots opposite each other closest to the keyboard, and they're staying there until the two 4's arrive. They're working in dual channel mode, the last BIOS time as reported in Task Manager is about 6 seconds, and the laptop seems to boot the quickest that way.
Larry aka CharlieDog
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