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Can i install 1 pair of 1g memory along with 1 pair of 2 gig memory?

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April 30, 2011 5:57:20 PM

I have a MSI MB with 4 memory slots allowing a total of 8 gig of memory. I now have 2 1 gig sticks of dual channel DDR2 1066 memory installed. Can I install 2 sticks of 2 gig DDR2 dual channel 1066 memory in the 2 ramaining slots to give me 6 gigs of memory? I have searched the MSI site but couldn't find the answer and the manual doesn't specify either. I want to bring memory up to at least 4 gigs so I can upgrade from XP to WIN7.

Thanks for any help

Jim D
a c 347 } Memory
April 30, 2011 6:03:18 PM

Welcome to Tom's Forum! :) 

ANS: Yes and Be Careful. Most Dual Channel MOBOs allow mixing sizes, though not all; see your manual or post you exact MSI MOBO and I can double check. Next, the Be Careful - you want both sets to have the EXACT same CAS Timings and most particularly Voltage.

Therefore, please post the following links:
1. Current MOBO
2. Current RAM
3. Proposed RAM
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May 1, 2011 7:01:02 PM

jaquith said:
Welcome to Tom's Forum! :) 

ANS: Yes and Be Careful. Most Dual Channel MOBOs allow mixing sizes, though not all; see your manual or post you exact MSI MOBO and I can double check. Next, the Be Careful - you want both sets to have the EXACT same CAS Timings and most particularly Voltage.

Therefore, please post the following links:
1. Current MOBO
2. Current RAM
3. Proposed RAM


Thanks for the response Jaquith,

The MB is a MSI K9A2 Platinum, The manual just states up to 8 gig of memory can be installed but gives no specifics other that to use pairs of matched dual channel. I have 2 matched 1 gig dual channel DDR2 sdram 1066 (PC8500) by Mushkin installed. Plan to install 2 matched 2 gig sticks of the exact same specifications except they are Kingston (Mushkin is no longer making the 1066 DDR2 memory in 2 gig sticks.

Thanks,
Jim
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a b } Memory
May 1, 2011 10:12:11 PM

You prabably know, but on the outside chance, remember you need 64 bit operating system for your 6 gigs of ram'
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a c 347 } Memory
May 1, 2011 11:13:48 PM

^+1 64-bit OS is required >4GB RAM.
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May 2, 2011 1:20:09 AM

And mismatched memory probably won't run in dual channel
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Best solution

May 2, 2011 5:54:08 AM

stillerfan15 said:
And mismatched memory probably won't run in dual channel


If their identical across both channels they should. He's saying 2 x 1Gb + 2 x 2Gb sticks, this is possible if installed in the following configuration.
(Assuming channel A and channel B, some boards switch the reference up, please read your manual).

DIMM_A1 => 2GB
DIMM_B1 => 2GB
DIMM_A2 => 1GB
DIMM_B2 => 1GB

Turns into
Channel A => 2 + 1
Channel B => 2 + 1

That can run in unganged mode just fine.
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a c 347 } Memory
May 2, 2011 3:55:58 PM

^If that's the correct Channel layout then I agree.

A > B = 2*B ; A < B = 2*A ; A = B == A + B and there's no loss. The size per Channel for Dual Channel should be equal, otherwise some MOBO's will simply ignore extra RAM e.g. Ch A = 4 & Ch B = 2 {A > B = 2*B} or 4GB.
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May 2, 2011 5:35:22 PM

Thanks for all your help guys :) . I've ordered the 2 2gig sticks because I wanted to have at least 4 gigs and the price of the 2 gig strips was within a few bucks of the price of 2 1 gig strips. I also ordered WIN 7 which has 2 disks; 1 for 32 and 1 for 64bit. I'm not sure if all my progs will run on 64 as some are a little old but I'll try 64 first and see. I'll post the results when I get everything installed, hopefully sucessfully. I might try some overclockig too.

Thanks again.
Jim D
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May 9, 2011 12:21:41 AM

Hi,
Just wanted to thank you for your help. I installed WIN 7 yesterday and it immediately recognized the 6 gig of memory. I'll run some speed test comparisons to find out how it ranks.

Thanks Again

Jim D
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a c 347 } Memory
May 9, 2011 1:34:48 AM

Cool! Window 7 is nice once you get used to the task bar behavior.
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May 19, 2011 1:06:06 AM

Best answer selected by ccgraf.
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