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Ram should always be paired. Same type, speed and size in each slot. You may have 1 SIMM/DIMM/DDR that has 2 sides of chips and the other with 1 which will do exactly what you state.
RAM reads across the chips simultaneously. So if you have a different one in each slot it can go bonkers and do goofy stuff on you.
Are the memory cards the same? Try swapping the memory cards inside the computer. It is also important to go into the Setup (F2) once the new memory has been added. The setup keeps track of the hardware changes to your computer, and the additional memory needs to be saved in the Setup configuration. Please let me know what happens and thank you. Binary Bob
First of all, make sure the ram are identical, becuase having 3 different random access memory chips in the computer can cause problems. Also make sure the ram chip is sitting in there properly. Next you should check under start go to run and type in "dxdiag".See how much memory it reports the computer has. If it reports 700etc mb,, then the one memory chip might be faulty. Also, check with the system manufacturuer, and make sure you're not overclocking the computer. Overclocking is when you put too much memory in a computer and it doesnt recognize one of the chips. 700etc mb might be the maximum your computer can handle.
The BIOS recognizes the same speed chip. Say, "PNY 512mb 333mhz 12ns". If you mix and mismatch, the BIOS won't see it even though your motherboard will take the differant type chips.
They should all be the same.