2048Megabytes

How much faster is the data transfer rate of PC2 5300 memory versus this PC 3200 Random Access Memory if they are both running at their peak rates? What I am not understanding is how much CAS Latency slows memory down.

Kingston 2 gigabyte (2 x 1 gigabyte) 240-Pin ECC Unbuffered PC2 5300 (DDR2 667) Dual Channel Kit Server Memory, CAS Latency 5, 1.8 Volts


SUPER TALENT 2 gigabyte (2 x 1 gigabyte) 184-Pin PC 3200 (DDR 400) Dual Channel Kit Desktop Memory, CAS Latency 3, 2.5 Volts

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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)