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Soler37
Paper Tape
Posts: 3
Registered: ‎06-05-2019
Location: IL
Views: 277
Message 1 of 6

Ideapad 330 15IKB 81DE Ram upgrade

Hello all.

 

So I finally upgraded my laptop to an SSD and it runs SO much better, I highly recommend anyone to upgrade to an SSD.

 

The laptop has a soldered 4GB memory and a slot for extending.

 

I would like to add another 4GB so that I can run in dual channel and 8GB would be enough for basic stuff.

 

I recently came across a memory that would be good, however, I don't really know what single/dual Rank is.

 

Was thinking about buying this.

 

Thank you.

 

Sr Support Specialist
Posts: 9,260
Registered: ‎11-30-2015
Location: PH
Views: 258
Message 2 of 6

Re: Ideapad 330 15IKB 81DE Ram upgrade

Hi Soler37,

 

Welcome to the Community Forums.

 

Here is a good post here in the Community that would explain more about ranks.

 

Recommended OEM RAM are listed in the hardware manual page 83 item 5. Best to check the frequency on the soldered ram to match to have a better match which maybe using similar app like this

 

You can also run crucial scanner if you like to check if CT4G4SFS824A is recommended for your model.

 

I hope this helps answer your query.

 

Regards



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Soler37
Paper Tape
Posts: 3
Registered: ‎06-05-2019
Location: IL
Views: 250
Message 3 of 6

Re: Ideapad 330 15IKB 81DE Ram upgrade

Thank you for the reply.

 

The item list does not help me as It does not state if my model has a single or dual rank. 

 

Cpuz doesn't help me atm as I already know that the frequency my laptop's ram is using is 2133.

 

I have tried running a test with crucial to detect which parts I need but unfortunately it does not detect my pc. I know how to use it as I've done it on my works pc and it worked. 

 

I simply want to know if I need single or dual rank and I can't seem to find the answer to that. 

Sr Support Specialist
Posts: 9,260
Registered: ‎11-30-2015
Location: PH
Views: 241
Message 4 of 6

Re: Ideapad 330 15IKB 81DE Ram upgrade

Hi Soler37,

 

Dual rank is different from dual channeling.

 

This is not a big factor for laptops unlike servers.

More about ranks and performance:

There are some cases where single rank is preferred:
From What is a memory Rank (Crucial)?
"The drawback with higher Ranked modules is that servers sometimes have a limit on how many Ranks they can address. For example, a server with four memory slots may be limited to a total of eight Ranks. This means you can install four Single Ranked modules or four Dual Ranked modules but only two Quad Ranked modules, as installing more would exceed the amount of Ranks that can be addressed." That applies only to (certain) servers, not laptops.
From Upgrading a Server or Workstation? Read this first! (Crucial):
"Higher rankings can also impact your memory bandwidth, forcing your memory to run at lower speeds when high-ranked parts are present. This trade-off may be required to utilize higher capacities of memory in some systems, though, if single- or dual-rank parts are not available at capacities desired, or if reduced ranking parts are not compatible with a system at higher memory totals. If none of these restrictions apply, there is otherwise no functional difference between rankings of parts." That applies only to quad rank or higher -- single and dual rank usually have the same timings -- and thus isn't relevant to laptops.
On dual rank versus single rank performance:
From DIMMs: Single vs. Double vs. Quad Rank (quoting IBM):
"... Whenever possible, it is recommended to use dual-rank DIMMs in the system. Dual-rank DIMMs offer better interleaving and hence better performance than single-rank DIMMs." [emphasis added]
"For instance, a system populated with six 2GB dual-rank DIMMs outperforms a system populated with six 2GB single-rank DIMMs by 7% for SPECjbb2005. Dual-rank DIMMs are also better than quad-rank DIMMs because quad-rank DIMMs will cause the memory speed to be down-clocked."

Ranks depend on the memory stick and chip (spd tab of CPUZ). Dual channeling works with mostly the with similar frequency at least. Picking a ram closest to this specifications would be the key . Ranks nowadays are not essential unlike before with latest technology we are using so it would not be a significant factor whether you pick a single or dual rank.

 

Best way to go on upgrading would still be choosing OEM recommended rams certified for your machine.

 

Regards



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If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.

Soler37
Paper Tape
Posts: 3
Registered: ‎06-05-2019
Location: IL
Views: 235
Message 5 of 6

Re: Ideapad 330 15IKB 81DE Ram upgrade

Again, thank you for the swift reply.

 

As I said, crucial cannot detect my system so I'm not sure how to about finding the OEM memory.

 

Also, the spd tab shows me nothing, not for slot 1 nor 2.

 

Thanks.

Sr Support Specialist
Posts: 9,260
Registered: ‎11-30-2015
Location: PH
Views: 218
Message 6 of 6

Re: Ideapad 330 15IKB 81DE Ram upgrade

Hi Soler37,

 

Aside from the FRU list mentioned above from the hardware manual, you can splace your serial here in parts lookup. Under configuration , click compatible and on the Commodity list to click on memory.

 

You can read further on this article:

How to Look Up and Purchase Accessories, Upgrades, and FRU/CRU Replacement Parts

 

Regards



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