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Problem mixing same kind but different size memory dimms


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My motherboard is a TForce 550 GF550 AM2 .


My CPU is an AMD Athlon 64 X2 Dual Core Processor 3600+ .


There are 4 DIMM slots, color coded in pairs such that each color coded pair when filled by a module pair produces Dual Channel mode.. Ive been running 1gb memory Model number: COR twin 2x1024-6400C4 (1gb total) comprised of twin 512 memory dimms.


I wanted more ram, so I bought essentially the same kind I already had, only it contained 2 gb instead of 1: COR twin 2x2048-6400C4 (2gb total).


When I filled the slots properly, the PC beeped strangely and refused to boot. I could use either the COR twin 2x1024-6400C4 module OR the COR twin 2x2048-6400C4 module , but not both together.


Max allowable memory on the motherboard is 4 gb.. So, Im sure Id have had no problem had I been using twin pairs of either type.. Its the mixing that was failing.. And this surprised me because I thought the modules were essentially the same.. Same timings, same type, same Corsair vendor.. Only difference was that one was a 1 gb module pair and the other a 2 gb module pair.


Does this make any sense? Im trying to find out if this is an expected, or an unexpected behavior of what I was trying to do. Ive read about guys on different forums with my motherboard who claim to have gotten what I tried to work, but they had non Corsair memory. Im a bit confused...

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Thanks for that.. makes me feel better than my system is NOT acting unexpectedly in not accepting use of all 4 dimms at once. I had read in other forums that users with the same Biostar motherboard are mixing the same size dimms I tried with no problem.. They were using another memory brand, so it seems some will work this way and others wont. Im very happy with my Corsair ram, and have no problem using the 2gb dimms all by themselves.. And if I need more, ram being so cheap today, Ill just lay in antoher 2gb module for the other slots.
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