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Windows 7: Laptop Ram 2gb + 4gb? different type

12 Mar 2018   #1
Smokes

Win7 & Win10 both Pro x64 Dual Boot
 
 
Laptop Ram 2gb + 4gb? different type

Hello
Ive 2 Dell 6410 laptops one with 2x4gb Samsung DDR3-1600 / PC3-12800 DDR3 SDRAM SO-DIMM

in the other 2x2gb Hynix DDR3-1333 / PC3-10600 DDR3 SDRAM SO-DIMM

These numbers are as clear as mud to me, I could not tell you if one is better than the other or if there is much difference between them.

Would I be able to use 6gb in each of my laptops or would I be better off buying 8GB and do away with the 2 x 2gb would there be much difference between 6gb and 8gb?

Thank you
Smokes


My System SpecsSystem Spec
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15 Mar 2018   #2
mrjimphelps

Linux Mint 18.2 xfce 64-bit (VMWare host) / Windows 8.1 Pro 32-bit (VMWare guest)
 
 

If you'll notice, one type of memory has numbers which are a bit higher than the other type. The higher numbers are potentially faster than the lower numbers. If you mix the two types in the same computer, the computer would go with the lower speed, so as to be able to use both types together.

You probably can mix the two, resulting in 6 GB for each machine. If so, then that would be a nice amount for each machine. I was unable to find the user guide for your computer, so I can't say for sure if you could mix the two. I suggest you call Dell and ask them that question. My biggest concern here is putting 2GB and 4GB in the same computer -- you may need to have the same capacity for both sticks. But that's not true with all computers. Some will let you mix and match. Hopefully yours is that way.

8 GB would be better than 6 GB, but not a lot better. 6 GB would be a good amount, and if you can achieve 6 GB in each machine, I would go with that. But if you can't combine it like that, then go with 8 in the one that now has 4.
My System SpecsSystem Spec
15 Mar 2018   #3
LMiller7

Windows 7 Pro 64 bit
 
 

In theory what you are proposing should work and in practice usually does. But not always.
And there isn't any way to know ahead of time if your specific situation will work.


In the real world any mismatch of module capacity or specifications can be problematic. Even modules with otherwise identical specifications but from different manufacturers may fail. The best assurance of avoiding problems is to use matched modules.


It is also worth noting that OEM computers are often picky about the memory modules they will accept. And they generally have few if any settings to deal with such problems.
My System SpecsSystem Spec
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15 Mar 2018   #4
mrjimphelps

Linux Mint 18.2 xfce 64-bit (VMWare host) / Windows 8.1 Pro 32-bit (VMWare guest)
 
 

I have worked with a lot of Dell computers over the years. Generally, what I have seen has been that they will let you combine memory of different speeds with no problem; to accommodate this, the bus operates at the speed of the slower memory. Sometimes it is problematic to mismatch memory on capacity -- in your case, 2 GB + 4 GB together. But that sometimes works as well.

The one thing which will definitely cause it to fail is when you have a mismatch on the type of memory. But all memory is DDR3, so it should work.

If it was me, if the owner's manual didn't tell me any different, I would put a 2GB and a 4GB into each computer and see what would happen. If you power up and it shows less than 6 GB, or if it locks up during the boot process, then power down and put all identical memory in each computer.
My System SpecsSystem Spec
15 Mar 2018   #5
AddRAM

Windows 7 Pro x64 Windows 10 Pro x64
 
 

Don`t mix the ram, buy the fastest 2 x 4GB kit you can get for that particular laptop.
My System SpecsSystem Spec
15 Mar 2018   #6
RoasterMen

Windows 7 Home Premium 64-BIT
 
 

We'll never know if it will work unless you install it in there.

For basic tasks 6GB of ram is fine.
My System SpecsSystem Spec
16 Mar 2018   #7
iko22

Windows 7 x64, Vista x64, 8.1 smartphone
 
 

The specs for the E6410 show that the laptop motherboard has only space for two RAM modules.

The computer will support up to 8GB over the two DDR3 slots, so one of your laptops is already at max capacity.

The other laptop can take 8GB (2 x 4 GB) with matched dual channel modules. However if you stick in a 4GB module along side a 2GB module, I think the computer will only allow you to access 4GB. This is because of the design of the memory controller. So, it would be better to do away with the 2 x 2GB and replace it with 2 x 4GB modules.
My System SpecsSystem Spec
16 Mar 2018   #8
mrjimphelps

Linux Mint 18.2 xfce 64-bit (VMWare host) / Windows 8.1 Pro 32-bit (VMWare guest)
 
 

Quote   Quote: Originally Posted by iko22 View Post
if you stick in a 4GB module along side a 2GB module, I think the computer will only allow you to access 4GB. This is because of the design of the memory controller.
What is it about the design of the memory controller that tips you off that he has to have matching sizes on the memory modules?

Thanks.
My System SpecsSystem Spec
16 Mar 2018   #9
iko22

Windows 7 x64, Vista x64, 8.1 smartphone
 
 

Quote   Quote: Originally Posted by mrjimphelps View Post
What is it about the design of the memory controller that tips you off that he has to have matching sizes on the memory modules?

Thanks.
Hello Jim, Id like to answer your question and I have two answers:
(a) Address (de)multiplexing, and (b) SPD tables

address multiplexing on dual channel RAM makes the address space interleaved across memory banks. And the memory controller always selects the lowest sized value when reading SPD tables.
My System SpecsSystem Spec
16 Mar 2018   #10
mrjimphelps

Linux Mint 18.2 xfce 64-bit (VMWare host) / Windows 8.1 Pro 32-bit (VMWare guest)
 
 

Thank you.
My System SpecsSystem Spec
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 Laptop Ram 2gb + 4gb? different type




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