The Mushkin Redline XP4000 accommodates selected Winbond UTT CH-5 chips. For overclockers it's probably the fastest DDR-RAM in the world with the best performance. This memory can run the tightest timings without any problems. But don't forget to cool it with a fan, which is a requirement for stable operation.
You will also need a motherboard which can give you the high DDR voltages, the memory needs to really shine. If your board supports only up to 3.3V VDDR, or even less you should look elsewhere.