In a number of ways especially when running some of the newer games that just "LOVE MEMORY" you will often see an immediate difference even if it is only a small one there at first. The problem often seen with smalled muliple dimms is what is termed "memory holes" where once the first dimm is filled a gap is seen when data jumps over to the next. I went from a matched pair of 512mb performance dimms to a pair of 1gb value memory and have seen a new machine in the process in more then one way(my old board crapped). But with 2gb I don't see any stalls or locks like what was seen with the 512s.
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