[CentOS] OT: hardware question

Hi, folks,

   I'm installing a RAID controller card for a large external RAID box in
a Dell server. I've got two riser slots available. Here's the question:
the controller card has some large chips on one side, and if I put it
in riser 1, those chips face downwards in the box, blocking ease of
cooling, while if I put it in riser 2, the chips will face up... but be
right over a large chip on the m/b that's got a heat sink.

   Opinions on which slot to use?

       mark