Product Detail Increase System Performance Easy to Install Lifetime Warranty Increased Bus speed and backward compatiable Optimized for use with Intel Pentium III, Pentium II, some Pentium 4, AMD K-6 & Athlon systems . The "Centon 256MBPC133 256MB PC133 133MHz SDRAM DIMM Memory" is best product for you. We recommended Centon 256MBPC133 256MB PC133 133MHz SDRAM DIMM Memory