Can there be performance problems or system conflicts if a computer is running on a PC133 bus and 50% of the SDRAM is PC100. I have a 766MHz PC133 with 128 MB RAM 64 of which is from my old machine from a PC100 bus. Will the new machine run at 100 or 133? Thanks Bruce Watts [log in to unmask] Do you want to signoff PCBUILD or just change to Digest mode - visit our web site: http://nospin.com/pc/pcbuild.html