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Mixing DDR266 and DDR333

Posted on 2006-07-14
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Last Modified: 2007-12-19
Hi, everyone, just much of curiosity, and wanted to try. is it alright to mix DDR266 and DDR333, which my mainboard runs only a DDR266. I read a book about it, which tells that, it's alright to put DDR333 RAM when your mainboard runs only DDR266, but it doesn't make a change, it will still run as DDR266. Just much of my curiosity, what if I'll mixed the Two (2), which are different type, because it has a same voltage requirements.

Anybody who experience mixing DDR266 and DDR333 would be much appreciated on your comment/suggestion.
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Question by:r2r
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by:Juan Ocasio
Juan Ocasio earned 50 total points
ID: 17113033
You can use the DDR333 in a DDR266 MB but it will only run at 266Mhz. I would recommend using the same type of RAM however.  NOt necessarily the same brand, but the chips with the same specs (CL, speed)

HTH

jocasio
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by:newbiekv
ID: 17113117
hi,

Both memory module will work but it won't be dual channel.  You need to have memory of the same speed for dual channel.
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garycase earned 75 total points
ID: 17113246
In the vast majority of cases they will work fine;  but there are exceptions.   Memory is SUPPOSED to be downwards compatible -- but it does NOT always work that way.   The SAFEST thing to do for absolute compatibility is to use memory rated at the speed the motherboard requires.

But the assumption in your question is correct (as noted above) -- it will simply still run as DDR266 in the case you cited.   HOWEVER, as newbiekv noted, the two modules will NOT run in dual channel mode, since the SPD information will be different (a dual-channel motherboard will not use the dual channel mode if the modules do not report identical specs in the SPD info).   Of course if you're not running a dual-channel-capable system that doesn't make any difference.
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by:Devario Johnson
ID: 17113387
like Gary said, this isnt the safest thing to do.  No prerformance increase.  best to stick to 266
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by:tmj883
ID: 17114294
If the features of your memory modules support "differential clock input", this should be no problem for a single channel memory system. Everest Home Edition can read the attributes of your memory modules:
http://www.majorgeeks.com/download4181.html
Available at above.
T
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by:willcomp
ID: 17116090
Odds are that it'll work without any problems.  If it doesn't, just remove memory module.  Should not affect (damage) either module.  There are some motherboards that might have problems related to newer, higher density chips but once again, no harm will befall your modules.
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