"With new systems main bottleneck being memory bandwidth faster memory modules are needed. NVidia has recently released the nForce 2 chipset that can run memory at 400MHz DDR dual channel, when overclocked. Intel has also announced plans for new chipsets (Springdale and Canterwood) that will also use dual channel 400 MHz DDR SDRAM to power the new Pentium IV'ss with the 800MHz QDR system bus. And VIA and SiS have been trying to make a 400MHz motherboard for several months now. So clearly the need for PC3200 (400MHz DDR) SDRAM is there but why would you be concerned about PC3500?" http://www.ocaddiction.com/reviews/memory/geil_pc3500ultra/