what are the differences between these rams?

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sanslash332

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Oct 27, 2017
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Hello guys again,
Well, I'm finding one 4gb ram module for my laptop (toshiba satellite c645 series PSC02U-00LLM1) and after finding by model on kingston webpage (on crucial my model didn't appear) t page recommends this model: KCP316SS8/4, but on my nearest store, only have this: KVR13S9S8/4
obviously the most notable difference is that the first is 1600 mhz and the second 1300 mhz, but I don't care about that, so the MoBo supports up to 1066 MHZ. which other differences have these rams? Do you think that the second is compatible with the laptop? I Know that KVR is generic value ram, but what means KCP?
Thanks for all guys.
 
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On double checking and doing further research, it seems the Toshiba Satellite c645 series PSC02U-00LLM1, is known as model C645-SP4146L.

This laptop only supports memory modules using memory chips ("tablets") with a density of 2 Gb. This means that 4 GB memory modules have to be using a total of 16 memory chips with a memory architecture arrangement at 256M x 8 bit ( = 2 Gb).

The modules KVR13S9S8/4 and KCP316SS8/4 are NOT compatible because they use memory chips with 4 Gb density which is not supported by the laptop.

So any memory module (whatever brand) using 4 Gb memory chips will not work, only memory modules using 2 Gb memory chips will work with this laptop.
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brispuss

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Dec 27, 2014
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The "KCP" series of memory are designed for specific models of computers. The memory chips used may be specifically selected and/or the SPD chips may be specifically programmed for specific models of computers.

The module KVR13S9S8/4 has similar parameters to that of module KCP316SS8/4 apart from difference in frequencies and possibly (some) timings.

Module KVR13S9S8/4 should be compatible with the laptop.
 
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sanslash332

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Oct 27, 2017
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Thanks for your answer! Finally I got the crucial's recommended ram, and works fine.

But, I have an other question. My laptop, have an Intel HM55 chipset, and in some post said that chipset doesn't support rams with tablets of 512Mb. And the crucial's ram is OK with that, because have 16 tablets of 256Mb. But, the kingston's recommended and tested ram ¡is a ram with 512Mb tablets!
So how is that? Kingston is bad? or what.

thanks for your answer!
 
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brispuss

Splendid
Dec 27, 2014
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On double checking and doing further research, it seems the Toshiba Satellite c645 series PSC02U-00LLM1, is known as model C645-SP4146L.

This laptop only supports memory modules using memory chips ("tablets") with a density of 2 Gb. This means that 4 GB memory modules have to be using a total of 16 memory chips with a memory architecture arrangement at 256M x 8 bit ( = 2 Gb).

The modules KVR13S9S8/4 and KCP316SS8/4 are NOT compatible because they use memory chips with 4 Gb density which is not supported by the laptop.

So any memory module (whatever brand) using 4 Gb memory chips will not work, only memory modules using 2 Gb memory chips will work with this laptop.
 
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sanslash332

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Oct 27, 2017
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Thanks for the clarification!

The most curious part about this, is that you do a memory search on kingston, with the 3 c645 models that appears on their system (look that https://www.kingston.com/us/memory/search?DeviceType=3&Mfr=TOS&Line=Satellite&Model=73532 ) on every of them, they recommend rams with 4Gb chips! So they are completely wrong or what?

So, apart of that, where you can find that information? looking in intel website viewing the specs of HM55, I can't find that information, or in Toshiba, they don't have a complete specs of the laptop model.

Because this missing information, I bought a wrong ram that obviously didn't work and I lost some dollars, but well.
Thanks for your information, you was really, really kind.
Bye.

PS: where you find which kind of chips use the specific ram module? Kingston have a datasheet for KVR models, but not for the KCP. Or says that these both are similar :p
Thanks!
 
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brispuss

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For a start, the laptop model you linked is for model C645-SP4135L, which is not the correct model. The correct model to search for should be C645-SP4146L. The search results of that model at Kingston are here.

Search under "Discontinued Memory Search" here.

Note the search results include 4 GB (system specific) modules.

Also note that 4 GB is NOT the same as 4 Gb!

GB means Giga-byte, whereas Gb means Giga-bit. And one Giga-byte (GB) = 8 Giga-bits (Gb). People often mix up and confuse these two notations.

The 4 GB (Giga-byte) modules will actually use sixteen 2 Gb (Giga-bit) density memory chips ("tablets").

The memory types/architecture that will be supported by systems is determined primarily by the memory controller, but the system BIOS may also limit what memory types are supported.

In this case here for the C645-SP4146L laptop, the memory controller is part of (integrated with) the CPU which in this case is model i3-370M. Looking up this model of CPU at Intel site and looking at/downloading the specification/data sheet for this (range of) CPU's, it can be seen under supported memory configuration that the CPU memory controller supports up to 2 Gb (Giga-bit) density memory chips.

Specifications for the KCP and KTT range of Kingston memory modules are not readily available, so internet searches are required to find specifications for these range of modules.
 
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sanslash332

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OK! Thanks for the aclaration again!

Well, first of all, sorry for the bad link. I bad assumed that the differences between these two c645 laptops are a minimal differences, and not a completely redessign. So after your aclaration, I find the model that I've linked, and effectively. That is a laptop with a i3-2xxx processor that is much newer than the i3-370m that my laptop have :p

Well, thanks for all. Dam Toshiba that doesn't put the complete name on their information. Only with the part number you can got the complete model name.

Thanks for all, again.
 
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