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hello

When u have dual system ram for example 200mhz 256x2 they should run at 400mhz each or atleast 200+ , i mean this is nothing big but just a thought on a my mind ''like take my ram for instance corsair 512x2 of 667mhz , now it says dual system and the timings are exaclty the same i bought them from the agent and the product id is like xxxxxx10 and the other one is xxxxxxxx11 so there built in the same time one after the other , and the technsion there told me so 2 , but now the ram is runing at 667mhz each , hmmm shouldnt it be more , thx

guyz sorry for the miss spell for the ''dual'' cant seem to find the option to change it :P

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Useful clarifications from . The following adds practical detail and checks that are still helpful years later.

Memory marketing uses effective data rate and bandwidth names, not simple clock addition. A module sold as "667" means 667 MT/s (often written DDR2-667 or PC2-5300); the internal DRAM clock is lower (half the DDR data rate). On many Intel platforms the front‑side bus is also quoted in a pumped MT/s figure, which is why those numbers can match — they describe different buses. See DDR2 SDRAM and Front‑side bus for the naming and clock relationships.

Quick checks to verify pairs and operation:

  1. Populate the slots the manual specifies (color‑coded pairs on most boards).
  2. Boot into BIOS and check SPD entries and the memory speed/timings shown.
  3. In the OS use CPU‑Z to confirm DRAM frequency and the reported channel mode (single/dual) — CPU‑Z shows DRAM frequency as the base clock, not MT/s (CPU‑Z download).
  4. If modules run at lower speed than rated, enable the memory profile in BIOS or set the rated voltage/timings manually and then test stability.

Compatibility and stability notes: matched kits are recommended because vendors bin modules to run together. Mixing different sizes, ranks or voltages can force the board to use a safer (slower) SPD setting or single‑channel/flex mode. After any change run a memory tester such as MemTest86 to confirm stability. Performance gains depend on workload; some applications (integrated GPUs, memory‑bound tasks) benefit more than others. See for deeper context.

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Member Avatar for willcomp

667MHz is correct. Memory speed is not additive. Dual channel doubles the memory bus bandwith from 64 bits to 128 bits but speed stays the same. The FSB is 133 MHz with an effective memory bus speed of 667MHz since DDR2 RAM is quad pumped (read 4 times per cycle).

commented: very smart +1
Member Avatar for Gaming wiz

667MHz is correct. Memory speed is not additive. Dual channel doubles the memory bus bandwith from 64 bits to 128 bits but speed stays the same. The FSB is 133 MHz with an effective memory bus speed of 667MHz since DDR2 RAM is quad pumped (read 4 times per cycle).

aha 'alright i understood , thanks

Member Avatar for willcomp

I erred in FSB speed -- should be 166MHz not 133MHz.

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