2048Megabytes

I was just running the program Memtest86. I noticed the throughput (speed) of my PC2 6400 RAM in dual channel mode was running at 2,678 megabytes per second. That isn't even half of the 6,400 megabyte per second rating. Is my Athlon 4600+ Dual-Core processor bottlenecking the RAM at these speeds while it is running Memtest86?

I know the computer technology industry always brags about the throughput of different devices and you usually get about half of the speed that they advertise. (For example USB 2.0 advertises at 60 megabytes per second (480 megabits per second) transfer rates but you really only get 20 megabytes per second or lower.)

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Operating Systems: Linux Ubuntu 9.04 and Windows Vista
Power Supply: OCZ StealthXStream OCZ600SXS
Video Card: MSI R3650-T2D512 OC Radeon HD 3650
Motherboard: Gigabyte GA-M78SM-S2H
Memory: Super Talent PC2-6400 2 gigabytes
Processor: Phenom 9550 Quad-Core (2.2 gigahertz)