This sequence worked: rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org rpm -Uvh http://www.elrepo.org/elrepo-release-7. ... noarch.rpm yum install nvidia-detect.x86_64 yum install kmod-nvidia reboot 2560x1440 is nice. Now to hook up the other display. Gentlemen (and ladies), thanks as always!! Peter -- Peter Laws, BS, MRCP / N5UWY National Weather Center / Network Operations Center University of Oklahoma Information Technology plaws@...