Sure most DDR modules are running about 400Mhz out of the package, nowadays it’s about the timings.  Take the Geil RAM that NGOHQ reviews for example.  The CAS timing of 1.5 allows a lot of room to loosen the timings, and bring the speed up significantly, which allows for much better performance overall.  Even if you don’t plan on overclocking, the tight timings on this RAM won’t slow you down.
“GeIL is a modest manufacturer that was founded in 1997. They have made other memory manufacturers stand up and take notice, and have gained a lot of fame in a very short time. Those that may want to know, GeIL stands for Golden Emperor International Ltd. Today we have the chance to review some GeIL CAS 1.5 DDR memory. Memory that runs at this latency is rare and is not easy to find. This DDR can run at 250MHz at CAS 2 with nice tight 2-2-5 timings.”

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