What’s the difference between DDR2 PC2-5300 and DDR2 PC2-6400 RAM?


After asking a question earlier this week, I decided to upgrade the RAM in my old laptop. Two different types of memory came up as compatible for the same price, DDR2 PC2-5300 and DDR2 PC2-6400. What’s the difference between the two? Should I choose one over the other?

Tags: DDR2, memory, RAM
Topic: Hardware
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What is the difference between PC2-4200 (DDR2-533), PC2-5300 (DDR2-667), PC2-6400 (DDR2-800), and PC2-8500 (DDR2-1066)?

"PC2-4200 (DDR2-533) refers to the bandwidth of the memory. A PC2-4200 module has the bandwidth of 4.2 GB/sec; therefore, it is referred to as PC2-4200.

DDR2-533 refers to the effective front-side bus speed of your system. While your DDR2 system or motherboard may operate a 266MHz front-side bus, its effective front-side bus speed is 533MHz because DDR2 effectively doubles the amount of data transferred per cycle that a non-DDR2 system would.

The same holds true for PC2-5300 (DDR2-667), which has a bandwidth of 5.3GB/sec and is designed for use in systems and motherboards that require a 333MHz front-side bus, with an effective front-side bus speed of 667MHz. And the same holds true for PC2-6400 (DDR2-800), which has a bandwidth of 6.4GB/sec and is designed for use in systems and motherboards that require a 400MHz front-side bus, with an effective front-side bus speed of 800MHz."

Pat Stephens
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Memory Clock of PC2 6400 runs at 400MHz and PC2 5300 at 333MHz. Using double data rate [DDR] that equates to 800MHz and 667MHz respectively. CAS latency is not as big an affect on performance as the speed of the memory itself, so providing your CPU and motherboard supports the faster PC2 6400 modules you should use those.


Thanks for the help. I just ordered the PC2 6400. Same price and it was listed as compatable by Crucial, so I should be good. Thanks again!

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