On 9/16/2014 1:39 PM, m.roth at 5-cent.us wrote: > No, I cannot "do the experiment". I've got to get these racked and up and > running, for my users to use. They're not my toys.... then call the vendor(s). ask their advice... now... if this is a rack mount Dell PowerEdge server, and a server-oriented RAID card, the airflow is NOT convective heat rising, its massive forced air from the front of the chassis to the rear. so orientation and whatever is not very important, lots of air will be forced past the heatsinks. -- john r pierce 37N 122W somewhere on the middle of the left coast