How important is it versus DDR2 800... seems like the lower the rating, the lower the CAS latency is. Wondering because I'm stuck on buying memory, currently at http://www.newegg.com/product/product.asp?item=N82E16820134066 right now, Kingston HyperX 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model KHX6400D2LLK2/2G, stuck between Kingston and Crucial memory sticks, preferably 4GB PC 6400+ just don't know if CAS latency should come into account when buying them.