The first time Neoseeker reviewed Crucial’s DDR2 it was certainly stable, but not very good on the overclock.  This second run of Crucial’s DDR2 is a little more forgiving, reaching speeds above 1000MHz, when the timings are loosened up.
“We’ve published a review of Crucial’s 2GB (2 x 1GB) PC2-6400 low latency memory where we also push it to see how much overhead these mature DDR2 sticks might have. Previously we took a look at some other Crucial low latency DDR2 and found they had very limited headroom, but this newer set showed a much more satisfying amount of overclocking capability.”

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