Here is the lspci information, both -x and -vv. This is with
two of the e1000 single-port NICS side-by-side. I have also
strapped a P-IV CPU fan on top of the two cards to blow some
air over them....running tests now to see if that actually
helps anything. If it does, I'll be sure to send you a picture :)
Ben, I checked the datasheet for the part shown in the lspci dump, and it
shows an operating temperature of 0-55 degrees C. You said you measured 50
degrees C, so you're within the safe range. Did the fans help?
Here's the datasheet:
http://www.intel.com/network/connectivity/resources/doc_library/data_sheets/
pro1000mt_sa.pdf
-scott