Memory - Dual Channel

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JimmyBrasco

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Jun 2, 2008
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56
Im just wondering about dual channel memory.

Say there is 2gb kit (2x1gb) 667MHz Dual Channel, would each card have 333 each? or each seperate one have 667MHz?

also if i had more memory faster than 667MHz, say 800MHz, they would be running at the slower speeds of 667MHz yes?
 

JimmyBrasco

Thread Starter
Joined
Jun 2, 2008
Messages
56
i was meaning if i had say 2gb (2x1gb) of 667MHz dual channel memory and another 2gb (2x1gb) of 800MHz dual channel memory i have read that the 800MHz would be running at 667Mhz as the run at the slowest speed memory you have. Is that true?

also still seeking about dual channel - 667MHz - 2x333mHz? or 2x667MHz
 

Frank4d

Retired Trusted Advisor
Joined
Sep 10, 2006
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9,126
When mixing speeds, all of the RAM will run at the slower speed.

667MHz is technically incorrect, though lots of places selling RAM call DDR2-667 RAM "667 MHz". The memory bus actually runs at 333 MHz and the RAM transfers data twice per clock, or 667 million data transfers per second (not "667 MHz").

Dual channel memory still runs at 333 MHz. In dual channel mode two sticks of RAM double the available bandwidth to the CPU. But that doesn't mean the CPU performance is doubled though. Dual channel mode is faster, but it isn't necessarily twice faster.
 
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