Is it possible to force PCI speed in the macpro?

Hi all!
Here is our little problem...
We have the last generation of macpro's and in our machine, we have installed an Arecca card as long as a decklink card. Problem is that sometimes when we boot the machine, the pci will stick to 2x for the arecca card, wich makes the data transfers a lot longer.
We do transfer some 2-5TB data often so it's kind of annoying when it sticks to 2x...
On the previous (first?) generation of macpro, we could specify the speed of each pci slot, but with the newer macpro's it's not possible anymore... Anyone know a way to constantly have the areca set to 8x?
Thanks,
Marck

Hi,
If this is an Apple Mac Pro January 2008 model the PCI-Express slots are fixed. The Mac Pro (January 2008) PCI Express bus bandwidth is no longer user configured. Slots one (video card) and two are configured as PCI Express 2.0 sixteen-lane PCIe slots. PCI Express slots 3 and 4 each provide PCIe revision 1, four-lane bandwidth.
If you are using slot 4 with an Apple Mac Pro January 2008 the PCIe bus is 4x. It will not provide a 2x bus. How are you measuring the speed of the PCIe bus bandwidth?
I have never seen this issue with my Areca ARC-1221x, ARC-1680x or ARC-1680ix-12 card. My guess is that you have an old driver and or firmware installed. If would be helpful to know the following:
1. The model of Mac Pro.
2. The model of Areca card.
3. The firmware installed on the card.
4. The driver version installed.
5. The version of Mac OS X installed.

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