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Mixing RAM

post #1 of 5
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Is there a guide on how to mix RAM around? I have 2x PC6400 800MHZ 1GB sticks at the moment and would like to upgrade by another 2GB for a total of 4GB but I'm unsure on what guidelines to follow in mixing manufactures CAS etc. Any help would be greatly appreciated. Thanks!
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My System
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post #2 of 5
for best result you are better off getting the same ram.

if you cant try to get ram that has the same speed/timmings/voltage

other will work but you are less likely to come across any complication/proformance issues with what i have stated above
post #3 of 5
Most DDR2 ram should work its just going to use the lowest speed memory and loose timings, and probably won't overclock well.

If I was you i'd sell what you currently have and just get this kit:
http://www.newegg.com/Product/Produc...82E16820231145

Very cheap for what it is, its faster than your current ram and its 4GB.
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post #4 of 5
Quote:
Originally Posted by noobdown View Post
for best result you are better off getting the same ram.

if you cant try to get ram that has the same speed/timmings/voltage

other will work but you are less likely to come across any complication/proformance issues with what i have stated above
Yes i tried before and the result was quite extreme.
I think it was 2X1G then I add another brand 2X1G, and it is actually slower after I added the memory.
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Newbuilt #1
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post #5 of 5
you should have no problems mixing and matching by itself.

the ram overclock would be limited though by the slowest stick of ram though. so lets say you have 2x1gb of ram that can overclock to 1000mhz but your new set overclocks only to 850mhz then you would be limited to 850mhz. the same applies with the timings. this is something that applies to even using the same brand make and model of ram though as every stick of ram is different. even among "matched" sticks of ram.

the other problem would arise out of more stress on the northbridge. most ram has has 16 chips on each stick of ram. so two sticks means the memory controller has to drive 32 chips. put 4 sticks of ram in and now you have to drive 64 sticks of ram. some people have had problems with that to where it puts a little much strain on that memory controller and now sticks that even if all of them might of been able to hit 1100mhz seperate when they put it into a 4x1gb configuration it now can only do lets say 900mhz. again though this can happen be it mixing ram of different makes and models or even using the same make and model.


so yeah other then that though mixing and matching ram should be ok and not cause any problems by just the mix/match part in itself, but due to the above problems not related to that I would say your best would be just to sell the ram you have and just go with 2x2gb instead.
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compy jr
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