RAM confusion

[mmurley]

My son bought a HP 15-dy1751ms and wanted to upgrade the RAM to 16 Gb.  He bought the wrong DDR4 RAM (computer failed POST).

 

Crucial shows both module SKU CT8G4SFRA32A (DDR4 PC4-25600 • CL=22 • Unbuffered • NON-ECC • DDR4-3200 • 1.2V • 1024Meg x 64) and module SKU CT8G4SFRA266 (DDR4 PC4-21300 • CL=19 • Unbuffered • NON-ECC • DDR4-2666 • 1.2V • 1024Meg x 64) as compatible.

 

HP's website is less than helpful.  Anyone have a clue?

[SupaKomputa]

While normally you can go for a higher clock Ram speed,  you should match the ratings for that laptop, which is 2666.

Why don't you test if you can boot it with the 3200 only.

[Parideboy]

When adding ram, the two sticks have to be identical, especially for laptops

[Haro]

5 minutes ago, mmurley said:

Anyone have a clue?

Assuming the first stick is not soldered, then try to boot with the 3200 stick. 

But mix and matching ram may and may not work. It's not 100% guaranteed. You could try returning this one and get a stick that's close of identical in terms of specs. 

Different cas latency could work as well. 

1 minute ago, SupaKomputa said:

you should match the ratings for that laptop, which is 2666.

They'll both run at 2666 anyways. 

[SupaKomputa]

1 minute ago, TofuHaroto said:

They'll both run at 2666 anyways. 

yes they should, but i'm not sure in laptops. probably hp have some ram whitelist.

or maybe it can't handle running double rank in both slots.

[Haro]

Just now, SupaKomputa said:

probably hp have some ram whitelist.

Theoretically any ddr4 sodimm should work just fine. 

But either way mix and matching ram isn't guaranteed to work really.. 

[Parideboy]

Have you tried to search this product code on HP site?

 

On the HP site is clearly stated:

Attention: Some motherboards are unable to configure memory modules with different manufacturers, CAS or density values. To make sure the memory is compatible, make sure all SO-DIMMs have the same part number.

[mmurley]

I don't think I was clear.  My son barely understands the concept of RAM, let alone pin configuration, DIMM or SODIMM, buffered or unbuffered, non-ECC or ECC, etc.

 

He bought 2x8 GB Corsair DDR4 PC4 SODIMM.  He did it without asking me.  Obviously he failed to read far enough into the the Amazon description to see the RAM speed is 2666 MHz and the RAM he bought was 2400 MHz.

 

HP's website is worse than useless as far as specific RAM requirements for that model.  Crucial showed both speeds (2666 and 3200) as compatible (but doesn't clearly indicate that that's "MHz" does it).

 

And the Crucial stick in the laptop is basically unmarked (it has a part number / SKU and bar codes but that's a Google chase he's not up to).

 

So he's very reticent to buy more RAM and take the laptop apart (again) only to find out its the wrong RAM.

 

I'm going to buy him a Crucial 2x8 Gb 2666MHz kit and put the onus on me rather than cause him more angst.

[mmurley]

18 hours ago, Parideboy said:

Have you tried to search this product code on HP site?

 

On the HP site is clearly stated:

Attention: Some motherboards are unable to configure memory modules with different manufacturers, CAS or density values. To make sure the memory is compatible, make sure all SO-DIMMs have the same part number.

His laptop only has a model number on the bottom - there's no sticker.  We used HP support's "ID your computer" web app and read everything in the support section.  No specificity.  And the enigmatic bar code and part number on the OEM Crucicial stick leads nowhere. 

Edited August 14, 2020 by mmurley
Grammar

[Slayerking92]

https://www.crucial.com/compatible-upgrade-for/hp---compaq/hp-15-dy1751ms : Crucial compatibility checker

 

https://www.kingston.com/us/memory/search?model=101033&devicetype=3&mfr=HEW&line=15 Series Notebook : Kingston compatibility checker