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Memory speeds DRAM vs effective frequency, effective bus speeds

Last response: in Motherboards
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December 26, 2009 7:37:15 PM

Hi all,

Everest reports my memory bus is effective clock is 533 MHz.

CPU-Z reports my memory DRAM Frequency is 266.0 MHz.

Dell's documentation here states that 400, 533, and 667 MHz dual-channel DDR2 is compatible.

A few questions:

1. Is 266.0 MHz DRAM frequency the same as 533 effective?

2. Is the memory bus speed reported by Everest the maximum speed or the speed it is currently running at? In other words, would this number change to 667 if I install the faster RAM?

3. Can multiple speeds of RAM be installed alongside each other on the bus?

4. Everest reports bandwidth of 8533 MB/s. Would this be reading & writing simultaneously? The memory read report shows 4322 MB/s. Would this just be a practical bandwidth as compared to 8533 MB/s as theoretical or does the bandwidth take other data into account to? Or maybe there are other factors slowing this down?

Lots of questions, I know. Thanks for any input you can provide.

David
a b } Memory
a b V Motherboard
December 27, 2009 2:56:16 AM

yes, yes, yes-will default to lower speed, ? 533hz = pc4200 or 4200 mb bandwidth then dual channel = (x2) = 8400 bandwidth. The theoretical limit which is not reality.
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