The end of the card (toward the back of the computer) is too thick to be inserted. The physical space/hardware conflict is that, next to slot 4, there’s a power connector on the motherboard that “conflicts” with the “fatter” 8 port assembly. You could unplug the “offending” motherboard connector to make the Sonnet eSATA 8 fit in slot 4, but the two fans behind the G5’s CPUs will stop spinning. That’s not a realistic solution.
I had at one point taken out that card all together to see how it ran. And although it seemed to run a bit better, the test was really too short and inconclusive; that essentially takes all my media offline and I didn’t feel that performance could be accurately tested if I ran 10-bit uncompressed video on the internal drive, even if it is my second drive for graphics.
Someone else suggested the some of the kernal mac errors are due to bad RAM. This is actually the second set of RAM I’ve gone through. And in addition to that, while I was waiting for my replacement RAM, I ran it for two days on the native Apple 512 that the machine shipped with. I experienced similar problems then as well. I’m beginning to wonder if it is my motherboard.