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Quick DDR2 memory question
First time using DDR2
Can I use DDR2 800 in a motherboard that specs for 533/667? I don't expect it to run at 800, but can I at least use it? TIA, Amir |
#2
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Quick DDR2 memory question
Amir Facade wrote:
First time using DDR2 Can I use DDR2 800 in a motherboard that specs for 533/667? I don't expect it to run at 800, but can I at least use it? TIA, Amir Grab a datasheet for one and have a look. This one advertises operation at both DDR2-800 and DDR2-667. And the clock specification tells you, in fact, that slower operation is also possible. http://www.valueram.com/datasheets/KHX6400D2_1G.pdf One difference between DDR2-800 memory and the slower ones, is the DDR2-800 chips have one additional ODT programming option. AFAIK, that doesn't stop them from being used in slower applications. In the pictures here, you can see there are three switchable options for ODT, shown in the block diagram for the RAM (figure 5, page 15). Presumably all those options are needed, for backward compatibility. http://download.micron.com/pdf/datas.../512MbDDR2.pdf In general, the memory specs are intended to encourage backward compatibiility with slower products. Paul |
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Quick DDR2 memory question
Thanks Paul
"Paul" wrote in message ... Amir Facade wrote: First time using DDR2 Can I use DDR2 800 in a motherboard that specs for 533/667? I don't expect it to run at 800, but can I at least use it? TIA, Amir Grab a datasheet for one and have a look. This one advertises operation at both DDR2-800 and DDR2-667. And the clock specification tells you, in fact, that slower operation is also possible. http://www.valueram.com/datasheets/KHX6400D2_1G.pdf One difference between DDR2-800 memory and the slower ones, is the DDR2-800 chips have one additional ODT programming option. AFAIK, that doesn't stop them from being used in slower applications. In the pictures here, you can see there are three switchable options for ODT, shown in the block diagram for the RAM (figure 5, page 15). Presumably all those options are needed, for backward compatibility. http://download.micron.com/pdf/datas.../512MbDDR2.pdf In general, the memory specs are intended to encourage backward compatibiility with slower products. Paul |
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