Which drive bay for an SSD as system drive?

Hey people. I just bought a 2009 Mac Pro 4,1 with 8 cores at 2.93 GHz. I also bought a 120GB SSD from OWC to use as the system drive. My question is: does it matter which bay I use for the SSD? I'd like to install the SSD in bay 1, because bay 1 seems more appropriate for a system drive, but I don't really know if this matters. Is bay 1 faster or have some kind of priority access to the CPUs? This machine came with a 2TB HDD in each of bays 1 and2. They are configured as a Mirrored RAID Set, but I think I will set them up as 4 TB regular storage. Thanks much for any helpful replies.
Monte

Or do I have less efficient air flow?
Less efficient.
It is obscure, and does not make a LOT of difference, but now some heated air can leak back through that vacant 1/2 inch space and enter the front of the main intake fan in place of a little bit of cooler outside air. With a full 1 inch drive there, the potential leak is plugged by the standard-height 3.5 inch drive.

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