Anders Holck
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Currently, I have the RR in the 2nd PCI-E slot on a 2008 2.8 Octo MAC with 10GB Ram. It gives me that "Your RR is in x4 PCI-E Lane" message when I boot up the RocketCine.
A bug with the card firmware at the moment in the MacPro 3,1, makes it run the slot at 4x instead of 8x, and makes it very slow and buggy.
You need to:
- shut down the machine.
- let it rest for >1 min.
- Power it up.
- Check system profiler like this: http://gallery.me.com/redrentaldk/100013
If it still says x4 try the procedure again. On my mac pro 3.1 there's a 50% chance it boots in x4 mode.