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Memory Bandwidth

We measured memory bandwidth with Sandra Lite 2007. Memory bandwidth, also known as transfer rate, is measured in MB/s. The methodology we used you can check in the previous page.

The results you can see on the chart and table below. On the table we included the maximum theoretical transfer rate for all DDR2 standards, both single channel and dual channel. As you can see, even though the reviewed memory kit achieved the best transfer rate among the selected memory modules, it is far from the maximum theoretical transfer rate. This is normal to occur with Intel CPUs, where the memory controller isn’t embedded in the CPU but located on the motherboard north bridge chip.

Patriot PDC21G8500ELK DDR2-1066 PC2-8500

Memory Module Transfer Rate (MB/s) Difference
DDR2-1066 Dual Channel Max. Theoretical 17,056 205.94%
DDR2-800 Dual Channel Max. Theoretical 12,800 129.60%
DDR2-667 Dual Channel Max. Theoretical 10,672 91.43%
DDR2-1066 Single Channel Max. Theoretical 8,528 52.97%
DDR2-533 Dual Channel Max. Theoretical 8,192 46.94%
DDR2-800 Single Channel Max. Theoretical 6,400 14.80%
Corsair CM2X512-8500C5 (DDR2-1066) 5,605 0.54%
Patriot PDC21G8500ELK (DDR2-1066) 5,575  
DDR2-667 Single Channel Max. Theoretical 5,336 4.48%
Corsair CM2X1024-6400C3 (DDR2-800) 5,280 5.59%
DDR2-800 Simulation (5-5-5-16) 5,155 8.15%
Corsair CM2X512A-5400UL (DDR2-667) 5,106 9.19%
DDR2-667 Simulation (5-5-5-13) 5,017 11.12%
Corsair CM2X512-4200 (DDR2-533) 4,887 14.08%
DDR2-533 Simulation (4-4-4-11) 4,787 16.46%
DDR2-533 Single Channel Max. Theoretical 4,264 30.75%

You should keep in mind that a higher memory transfer rate does not necessarily translate into a higher system overall performance.

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Gabriel Torres is a Brazilian best-selling ICT expert, with 24 books published. He started his online career in 1996, when he launched Clube do Hardware, which is one of the oldest and largest websites about technology in Brazil. He created Hardware Secrets in 1999 to expand his knowledge outside his home country.