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Windows 7: Combining Two Sticks of RAM (Different Size)

04 Feb 2015   #1
TheDeerDude

Windows 7 Home Premium (x64)
 
 
Combining Two Sticks of RAM (Different Size)

Hello! I've heard that ideally, RAM sticks should be paired. However, to get extra 2GB of RAM I've replaced one of my 2GB sticks with a 4GB I had lying around

Before:
2x 2GB

After:
1x 2GB, 1x 4GB

Here are some more details: (See attachments)

My question is, am I okay using these? is it worth those extra 2GB? (64-bit OS)




Attached Images
Combining Two Sticks of RAM (Different Size)-1.png Combining Two Sticks of RAM (Different Size)-2.png 
My System SpecsSystem Spec
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04 Feb 2015   #2
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

The reason for the recommendation (to do matched pairs) is to avoid common RAM problems. This does not mean you have to have a problem if you don't. It just increases your chances.

It is less of a concern that the RAM modules are of different sizes (2GB vs 4GB).

It is more of a concern when the modules are different speeds (PC3-8500 1066MHz -vs- PC3-10700 1333MHz). Although the system will just run both sticks at the slower speed (1066MHz).

But the real risk (of RAM errors) comes when you run RAM modules with different timings (7-7-7-27 -vs- 9-9-9-24).

But so far so good? Maybe you got lucky. Some RAM will play nice together.

Have you run a RAM test yet? I suggest at least 3 passes with Memtest86+ - Advanced Memory Diagnostic Tool
My System SpecsSystem Spec
05 Feb 2015   #3
TheDeerDude

Windows 7 Home Premium (x64)
 
 

Thank you for all this information, it will come in handy in future.
I was aware that the faster stick would be slown down by the other one, but it doesn't matter since it's the one giving me those 2 extra GB and it's still fast.

Now, how are the timings different from the speed?

And yes, so far so good (managed to even play a game which ran more smoothly) but I'll give Memtest86+ a go, thank you.
My System SpecsSystem Spec
.

05 Feb 2015   #4
rvcjew

7 Pro x64, 10 Pro x64
 
 

Quote   Quote: Originally Posted by TheDeerDude View Post
Thank you for all this information, it will come in handy in future.
I was aware that the faster stick would be slown down by the other one, but it doesn't matter since it's the one giving me those 2 extra GB and it's still fast.

Now, how are the timings different from the speed?

And yes, so far so good (managed to even play a game which ran more smoothly) but I'll give Memtest86+ a go, thank you.
Here is a good article explaining it. Memory timings - Wikipedia, the free encyclopedia also to see your current timings with your mixed sticks use the memory tab in cpu-z vs spd tab. In your memory tab it should say your single and no longer dual channel since your sticks are different and it has to mix their timings so both are same(ie, one lower).
My System SpecsSystem Spec
07 Feb 2015   #5
TheDeerDude

Windows 7 Home Premium (x64)
 
 

Now I understand it all better, thank you. That article was useful. Also, it runs just fine for now so I'll just leave it like that.

Thanks for help everyone
My System SpecsSystem Spec
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 Combining Two Sticks of RAM (Different Size)




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