"When you purchase "performance" RAM, overclocking is usually a major selling point. The published timings of 2/3/2/5 only carried up to 420MHz DDR, and from there adjustments were required to keep the system stable. At 440MHz DDR, the timings had to be relaxed to 2.5/3/3/8, and I was able to hit a maximum overclock of 450Mhz DDR with the same timings. "