Good Day Les, First off, I tried a reply off list, but your mailbox is not responding to direct input. My appologies to the list for an off topic reply... I'm sorry I can't help with your question, but I did want to ask since you appear to be running a similar setup as I have here with the dual Xeons. Might I ask what software are you running on the machines? I'm looking for someone with a handle on the WRF or MM5 numerical model that has gotten the thing to compile with either the Intel compiler or with the Portland group compiler with either/and / or both models. I have not switched to the yum update for automatic software updates, rather staying with the up2date as it came on installation. I'm very new to CentOS and have not done much in the way of updating except what comes down the tubes from RH. So far, I've not seen any kernal updates to date... Regards, Sam -- Snowman