Benchmarks
In the first test, we
check out the properties of the modules and how they perform in Sandra XI
benchmarks. The screen capture below is for the Samsung module running at
DDR3-1333 with a ratio of CPU:RAM=3:5 as shown in CPU-Z. The ram timing is
CAS 9, 9, 9, 25, 2T. Using the QX9770 which clocks at 400MHz, a ratio of
3.33x is chosen in the BIOS to run the modules at CAS 9, DDR3-1333.
As we can see from the screen shot below. The memory bandwidth obtained is
7558/7569MB/s and it has a memory latency of 80ns and a speed factor
of 85.20.
Using the same approach, we ran the same benchmark against
the Kingston DDR3-1800 module. As the CPU runs at 400MHz and the maximum
multiplier of 4x is chosen, we are in fact running at DDR3-1600. From the
results, it can be seen that the Memory bandwidth scored 7773/7777. Memory
latency is 78ns with a speed factor of 79.4. At DDR3-1600, the module runs
at CAS 10,11,11,31,2T.
It is apparent that running at at higher clock will
result in a better bandwidth, in this case at the expense of a higher CAS
Latency. As we have seen in the past, a higher cas latency will not have much
impact.
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