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The OptiPlex 755 is an energy-efficient desktop computer designed for businesses. It was released in mid 2007.

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Why RAM is not supporting by my Dell optiplex pc?

I have Dell optiplex 990 with 4 GB of RAM. I bought more 4 GB to increase the RAM capacity. I bought same DDR3 RAM but after plugging in system won't start. With my old RAM its working but not working with new RAM. Just moving the fan and stops.

Shopkeeper has rechecked the new one RAM and that is working fine on other PC. What should i do?

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Hi @rudraji

Just verifying that you installed the memory in slots A1 and B1 on the motherboard?

Also did you check that the new memory is DDR3L and not DDR3? According to the specifications for a Dell Optiplex 990, it requires DDR3L-1600 UDIMM memory

DDR3L works at 1.35V and DDR3 works at 1.5V. Some motherboards will work if you install DDR3 in a DDR3L slot and others won't. A lot of the time DDR3 memory won't work in Dell motherboards that require DDR3L memory.

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Rudra Swami crwdns2893898:0crwdne2893898:0
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