Thermaltake Silent Boost RX CL-P0295 for AMD Athlon XP, Sempron K7 Designed for AMD Athlon XP up to 3400+ and Sempron K7 All-copper heatsink, larger area for improving heat dissipation Support 9 or 8cm fan 3-point fixed clip easy to install Unique Reversed Fan reduces the noise from air-rebounding and create better air flow for heat dissipation