Windows 7 Ram Running at lower clock speed !!

ok Thanks guys. But one doubt...what if i would have purchased 1 gb ram. Then it would have displyed 800 Mhz ?
And also i have a single Chip of 2 Gb ram. There should be 2 Ram chip to enable Dual channel na ?
 
This guide from wiki should answer your questions..

DDR2 SDRAM is a Link Removed due to 404 Error Link Removed due to 404 Error interface. It supersedes the original Link Removed due to 404 Error specification and the two are not compatible. In addition to Link Removed due to 404 Error the data bus as in Link Removed due to 404 Error, (transferring data on the rising and falling edges of the bus clock signal), DDR2 employs an I/O buffer between the memory and the data bus so that the data bus can be run at twice the speed of the memory clock. The two factors combine to achieve a total of 4 data transfers per memory clock cycle.
With data being transferred 64 Link Removed due to 404 Error at a time, DDR2 SDRAM gives a transfer rate of (memory clock rate) × 2 (for bus clock multiplier) × 2 (for dual rate) × 64 (number of bits transferred) / 8 (number of bits/byte). Thus with a memory clock frequency of 100 MHz, DDR2 SDRAM gives a maximum transfer rate of 3200 Link Removed due to 404 Error/Link Removed due to 404 Error.
Since the memory clock runs at half the external data bus clock rate, DDR2 memory operating at the same external data bus clock rate as DDR will provide the same bandwidth but with higher Link Removed due to 404 Error, resulting in inferior performance. Alternatively, DDR2 memory operating at twice the external data bus clock rate as DDR may provide twice the bandwidth with the same latency (in nanoseconds). The best-rated DDR2 memory modules are at least twice as fast as the best-rated DDR memory modules.

You can find the rest of the article here:

DDR2 SDRAM - Wikipedia, the free encyclopedia
 
This guide from wiki should answer your questions..

DDR2 SDRAM is a double data rate synchronous dynamic random access memory interface. It supersedes the original DDR SDRAM specification and the two are not compatible. In addition to double pumping the data bus as in DDR SDRAM, (transferring data on the rising and falling edges of the bus clock signal), DDR2 employs an I/O buffer between the memory and the data bus so that the data bus can be run at twice the speed of the memory clock. The two factors combine to achieve a total of 4 data transfers per memory clock cycle.
With data being transferred 64 bits at a time, DDR2 SDRAM gives a transfer rate of (memory clock rate) × 2 (for bus clock multiplier) × 2 (for dual rate) × 64 (number of bits transferred) / 8 (number of bits/byte). Thus with a memory clock frequency of 100 MHz, DDR2 SDRAM gives a maximum transfer rate of 3200 MB/s.
Since the memory clock runs at half the external data bus clock rate, DDR2 memory operating at the same external data bus clock rate as DDR will provide the same bandwidth but with higher latency, resulting in inferior performance. Alternatively, DDR2 memory operating at twice the external data bus clock rate as DDR may provide twice the bandwidth with the same latency (in nanoseconds). The best-rated DDR2 memory modules are at least twice as fast as the best-rated DDR memory modules.

You can find the rest of the article here:

DDR2 SDRAM - Wikipedia, the free encyclopedia

Thanks Dude !!
 
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