On my Biostar Tforce 550 motherboard, I currently have a 1 gb (2 x 512mb) DDR2 PC2-6400 TWIN2X1024-6400C4 Corsair ram. That leaves the other channel with 2 slots open.. I was planning on populating them with TWIN2X2048-6400C4 which is the exact same type of ram, except its a larger module, holding 2 gb (2 x 1 gb). Together, I figured this would give me a total of 3 gb ram.
Unfortunately, Corsair is telling me I cant mix the sizes between one channel and the other! .. That is, even if the same chips are used and the memory type is identical, the fact that one channel has a 1gb module populated by 2 x 512mb sticks, and the other channel has a 2gb module populated by 2 x 1gb sticks, the SPD will not be the identical because the module size will be different.. Other than that, the sticks are the same, both containing Corsair PC2-6400C4 ram. I had no idea the quantity of memory in each of the two channels had to be the same.. I knew that both slots within Each channel had to contain the same quantity, but I thought the two channels themselves were somewhat autonomous.
This means that, if I want to leverage my current 1gb of ram, I can only buy 1 more gb of the same ram, giving me a total of 2gb. IF I want more than a total of 2gb ram, I basically need to throw out my current 1gb (2 x 512mb) module, and buy two new 2 x 2gb modules (4 x 1gb sticks).
This is what im being told from Corsair:
"Dear Valued Customer,
Adding 2 x 1 GB modules to your existing 2 x 512MB will most likely not be stable and is not recommended. The ICs used for the 512MB modules are different from the ones that are used in the 1GB modules. In order for the system to be stable all the RAM needs to be in sync, and all the ICs on the RAM need to be exactly the same. Since the ICs are not exactly the same on these 2 different sets of modules, there may be instances where the RAM gets out of sync (even if it is in milliseconds) and this can cause errors and crash your system. It is NOT recommended to mix and match any modules together on this platform as it can cause many problems. My suggestion would be to add only what you currently have in your system to the exact part number or replace all the modules with new ones. Sorry about that."
Do you all agree with this?
Unfortunately, Corsair is telling me I cant mix the sizes between one channel and the other! .. That is, even if the same chips are used and the memory type is identical, the fact that one channel has a 1gb module populated by 2 x 512mb sticks, and the other channel has a 2gb module populated by 2 x 1gb sticks, the SPD will not be the identical because the module size will be different.. Other than that, the sticks are the same, both containing Corsair PC2-6400C4 ram. I had no idea the quantity of memory in each of the two channels had to be the same.. I knew that both slots within Each channel had to contain the same quantity, but I thought the two channels themselves were somewhat autonomous.
This means that, if I want to leverage my current 1gb of ram, I can only buy 1 more gb of the same ram, giving me a total of 2gb. IF I want more than a total of 2gb ram, I basically need to throw out my current 1gb (2 x 512mb) module, and buy two new 2 x 2gb modules (4 x 1gb sticks).
This is what im being told from Corsair:
"Dear Valued Customer,
Adding 2 x 1 GB modules to your existing 2 x 512MB will most likely not be stable and is not recommended. The ICs used for the 512MB modules are different from the ones that are used in the 1GB modules. In order for the system to be stable all the RAM needs to be in sync, and all the ICs on the RAM need to be exactly the same. Since the ICs are not exactly the same on these 2 different sets of modules, there may be instances where the RAM gets out of sync (even if it is in milliseconds) and this can cause errors and crash your system. It is NOT recommended to mix and match any modules together on this platform as it can cause many problems. My suggestion would be to add only what you currently have in your system to the exact part number or replace all the modules with new ones. Sorry about that."
Do you all agree with this?