RAM Which stands for Random Access Memory, helps devices to run faster. If you love to play games on your desktop computer, then you will know the benefits of having some extra RAM.
It's better to use 2 2GB modules not for any appreciable speed difference (although there may be a small advantage more in a bit) but for a more reliable memory subsystem.
Most desktop systems use unbuffered RAM modules this results in very large loads on the address and data buses when you have more than 2 modules installed, and can significantly degrade the signalling on these buses. The memory subsystem "sees' one load per memory chip so with 2 modules installed, that's up to 32 loads (with double-sided modules) ... and with 4 modules installed that's as many as 64 electrical loads on the bus.
Some systems automatically adjust for this higher load by either increasing the voltage a small amount; reducing the clock frequency of the memory (thus slightly slowing it down); or by adding a cycle to the SPD's latency setting (again, slightly slowing it down). These adjustments help keep the memory subsystem reliable -- but mean that 4 x 1GB modules would be slightly slower than 2 x 2GB modules on these systems. But regardless of whether there's any timing differences, the memory will definitely be more reliable with only 2 modules.
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For a bit more detail on this, watch Item 10 on this presentation: http://www.corsairmemory.com/memory_basics/index.html
Article source: experts-exchange
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