SATA ports 5 & 6, are they on the same connector ?

I have an "early 2008" Mac Pro. Al four drive bays are filled with 3,5 inch drives, and I placed 2 SSD's in the optical bay and connected them to the 2 extra SATA ports that are on the logicboard.
However, the drives are not reaching their full speed. They are capable of reaching speeds of op to 250 MB/s, so when used in a striped raid they should be able to reach 450 to 500 MB/s. However, I don't get any faster than 300 to 350 MB/s.
So I'm thinking: Is it possible that those two ports are in fact only one SATA 300 port, but with two connectors ? That would explain the "slow" speed...
Thanks in advance !

1. The maximum average transfer speeds of internal SATA RAID 0 sets are limited on the both the 2009 'Nehalem' Mac Pro and previous Mac Pros. This may be due to the fact that the I/O hub has only 1000MB/s to distribute among all I/O devices including USB and FireWire. In our testing, we saw a max 725MB/s READ no matter how many SSDs we threw at it. Keep in mind that the Intel X25-Es that we used clocked 268MB/s READ as single drives, so theoretically, four should achieve 1000MB/+. Six have the potential to go 1500MB/s.
Inference is sometimes the only way to get at something's truth or falsehood.

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